注释

src/MetaData.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+// MetaData类继承自Task类，负责处理任务的元数据
+public class MetaData extends Task {
+    private final static String TAG = MetaData.class.getSimpleName(); // 用于日志记录的TAG
+
+    private String mRelatedGid = null; // 存储相关任务的ID
+
+    // 设置元数据，包括任务ID和相关的元信息
+    public void setMeta(String gid, JSONObject metaInfo) {
+        try {
+            // 将任务ID放入元信息JSON对象中
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+        } catch (JSONException e) {
+            Log.e(TAG, "failed to put related gid"); // 记录错误
+        }
+        setNotes(metaInfo.toString()); // 设置笔记内容为元信息的字符串表示
+        setName(GTaskStringUtils.META_NOTE_NAME); // 设置名称
+    }
+
+    // 获取相关任务的ID
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+
+    // 检查当前对象是否值得保存
+    @Override
+    public boolean isWorthSaving() {
+        return getNotes() != null; // 如果笔记内容不为空，则值得保存
+    }
+
+    // 从远程JSON对象设置内容
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        super.setContentByRemoteJSON(js); // 调用父类方法
+        if (getNotes() != null) {
+            try {
+                // 将笔记内容转换为JSON对象
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                // 获取相关任务的ID
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                Log.w(TAG, "failed to get related gid"); // 记录警告
+                mRelatedGid = null; // 设置为null以表示失败
+            }
+        }
+    }
+
+    // 此方法不应被调用，抛出异常
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+    }
+
+    // 此方法不应被调用，抛出异常
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+    }
+
+    // 此方法不应被调用，抛出异常
+    @Override
+    public int getSyncAction(Cursor c) {
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+    }
+}

src/Node.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import org.json.JSONObject;
+
+/**
+ * Node类是一个抽象类，表示一个同步节点，包含了节点的基本属性和同步操作。
+ */
+public abstract class Node {
+    // 同步操作的常量定义
+    public static final int SYNC_ACTION_NONE = 0; // 无操作
+    public static final int SYNC_ACTION_ADD_REMOTE = 1; // 添加到远程
+    public static final int SYNC_ACTION_ADD_LOCAL = 2; // 添加到本地
+    public static final int SYNC_ACTION_DEL_REMOTE = 3; // 从远程删除
+    public static final int SYNC_ACTION_DEL_LOCAL = 4; // 从本地删除
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5; // 更新远程
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6; // 更新本地
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7; // 更新冲突
+    public static final int SYNC_ACTION_ERROR = 8; // 错误
+
+    // 节点的基本属性
+    private String mGid; // 唯一标识符
+    private String mName; // 节点名称
+    private long mLastModified; // 上次修改时间
+    private boolean mDeleted; // 是否已删除
+
+    // 构造函数，初始化节点属性
+    public Node() {
+        mGid = null; // 初始化 Gid 为 null
+        mName = ""; // 初始化名称为空字符串
+        mLastModified = 0; // 初始化最后修改时间为 0
+        mDeleted = false; // 初始化删除状态为 false
+    }
+
+    // 抽象方法：获取创建操作的 JSON 对象
+    public abstract JSONObject getCreateAction(int actionId);
+
+    // 抽象方法：获取更新操作的 JSON 对象
+    public abstract JSONObject getUpdateAction(int actionId);
+
+    // 抽象方法：根据远程 JSON 设置内容
+    public abstract void setContentByRemoteJSON(JSONObject js);
+
+    // 抽象方法：根据本地 JSON 设置内容
+    public abstract void setContentByLocalJSON(JSONObject js);
+
+    // 抽象方法：从内容获取本地 JSON 对象
+    public abstract JSONObject getLocalJSONFromContent();
+
+    // 抽象方法：根据 Cursor 获取同步操作
+    public abstract int getSyncAction(Cursor c);
+
+    // 设置 Gid
+    public void setGid(String gid) {
+        this.mGid = gid;
+    }
+
+    // 设置名称
+    public void setName(String name) {
+        this.mName = name;
+    }
+
+    // 设置最后修改时间
+    public void setLastModified(long lastModified) {
+        this.mLastModified = lastModified;
+    }
+
+    // 设置删除状态
+    public void setDeleted(boolean deleted) {
+        this.mDeleted = deleted;
+    }
+
+    // 获取 Gid
+    public String getGid() {
+        return this.mGid;
+    }
+
+    // 获取名称
+    public String getName() {
+        return this.mName;
+    }
+
+    // 获取最后修改时间
+    public long getLastModified() {
+        return this.mLastModified;
+    }
+
+    // 获取删除状态
+    public boolean getDeleted() {
+        return this.mDeleted;
+    }
+}

src/SqlData.java

@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+import net.micode.notes.gtask.exception.ActionFailureException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * SqlData类用于处理与数据库交互的笔记数据，包括创建、读取和更新操作。
+ */
+public class SqlData {
+    private static final String TAG = SqlData.class.getSimpleName(); // 日志标签
+
+    private static final int INVALID_ID = -99999; // 无效 ID 常量
+
+    // 定义用于查询的数据列
+    public static final String[] PROJECTION_DATA = new String[] {
+            DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
+            DataColumns.DATA3
+    };
+
+    // 数据列索引
+    public static final int DATA_ID_COLUMN = 0;
+    public static final int DATA_MIME_TYPE_COLUMN = 1;
+    public static final int DATA_CONTENT_COLUMN = 2;
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
+
+    private ContentResolver mContentResolver; // 内容解析器，用于与内容提供者交互
+
+    private boolean mIsCreate; // 标识是否为新创建的数据
+
+    private long mDataId; // 数据 ID
+    private String mDataMimeType; // 数据 MIME 类型
+    private String mDataContent; // 数据内容
+    private long mDataContentData1; // 数据内容的附加信息 1
+    private String mDataContentData3; // 数据内容的附加信息 3
+
+    private ContentValues mDiffDataValues; // 存储待更新的内容值
+
+    // 构造函数，初始化 SqlData 实例（用于创建新数据）
+    public SqlData(Context context) {
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = true; // 设置为创建状态
+        mDataId = INVALID_ID; // 初始化数据 ID
+        mDataMimeType = DataConstants.NOTE; // 默认 MIME 类型
+        mDataContent = ""; // 初始化内容为空
+        mDataContentData1 = 0; // 初始化附加信息 1
+        mDataContentData3 = ""; // 初始化附加信息 3
+        mDiffDataValues = new ContentValues(); // 初始化待更新内容值
+    }
+
+    // 构造函数，初始化 SqlData 实例（从游标加载数据）
+    public SqlData(Context context, Cursor c) {
+        mContentResolver = context.getContentResolver(); // 获取内容解析器
+        mIsCreate = false; // 设置为非创建状态
+        loadFromCursor(c); // 从游标加载数据
+        mDiffDataValues = new ContentValues(); // 初始化待更新内容值
+    }
+
+    // 从游标加载数据
+    private void loadFromCursor(Cursor c) {
+        mDataId = c.getLong(DATA_ID_COLUMN); // 获取数据 ID
+        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN); // 获取 MIME 类型
+        mDataContent = c.getString(DATA_CONTENT_COLUMN); // 获取内容
+        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN); // 获取附加信息 1
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN); // 获取附加信息 3
+    }
+
+    // 设置内容，从 JSON 对象加载数据
+    public void setContent(JSONObject js) throws JSONException {
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID; // 获取 ID
+        if (mIsCreate || mDataId != dataId) {
+            mDiffDataValues.put(DataColumns.ID, dataId); // 更新 ID
+        }
+        mDataId = dataId; // 设置 ID
+
+        String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
+                : DataConstants.NOTE; // 获取 MIME 类型
+        if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType); // 更新 MIME 类型
+        }
+        mDataMimeType = dataMimeType; // 设置 MIME 类型
+
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : ""; // 获取内容
+        if (mIsCreate || !mDataContent.equals(dataContent)) {
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent); // 更新内容
+        }
+        mDataContent = dataContent; // 设置内容
+
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0; // 获取附加信息 1
+        if (mIsCreate || mDataContentData1 != dataContentData1) {
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1); // 更新附加信息 1
+        }
+        mDataContentData1 = dataContentData1; // 设置附加信息 1
+
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : ""; // 获取附加信息 3
+        if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3); // 更新附加信息 3
+        }
+        mDataContentData3 = dataContentData3; // 设置附加信息 3
+    }
+
+    // 获取内容，返回 JSON 对象
+    public JSONObject getContent() throws JSONException {
+        if (mIsCreate) {
+            Log.e(TAG, "it seems that we haven't created this in database yet"); // 日志警告
+            return null; // 尚未创建，返回 null
+        }
+        JSONObject js = new JSONObject(); // 创建 JSON 对象
+        js.put(DataColumns.ID, mDataId); // 设置 ID
+        js.put(DataColumns.MIME_TYPE, mDataMimeType); // 设置 MIME 类型
+        js.put(DataColumns.CONTENT, mDataContent); // 设置内容
+        js.put(DataColumns.DATA1, mDataContentData1); // 设置附加信息 1
+        js.put(DataColumns.DATA3, mDataContentData3); // 设置附加信息 3
+        return js; // 返回 JSON 对象
+    }
+
+    // 提交数据到数据库
+    public void commit(long noteId, boolean validateVersion, long version) {
+        // 处理创建新数据的情况
+        if (mIsCreate) {
+            if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
+                mDiffDataValues.remove(DataColumns.ID); // 移除无效 ID
+            }
+
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId); // 设置笔记 ID
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues); // 插入数据
+            try {
+                mDataId = Long.valueOf(uri.getPathSegments().get(1)); // 获取新创建的 ID
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString()); // 日志错误
+                throw new ActionFailureException("create note failed"); // 抛出异常
+            }
+        } else { // 处理更新数据的情况
+            if (mDiffDataValues.size() > 0) { // 如果有待更新的数据
+                int result = 0;
+                if (!validateVersion) {
+                    // 不进行版本验证直接更新
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                } else {
+                    // 进行版本验证更新
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
+                            " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+                                    + " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
+                                    String.valueOf(noteId), String.valueOf(version)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing"); // 日志警告
+                }
+            }
+        }
+
+        mDiffDataValues.clear(); // 清空待更新数据
+        mIsCreate = false; // 设置为非创建状态
+    }
+
+    // 获取数据 ID
+    public long getId() {
+        return mDataId; // 返回数据 ID
+    }
+}

src/SqlNote.java

@@ -0,0 +1,505 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.tool.ResourceParser;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class SqlNote {
+    private static final String TAG = SqlNote.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;
+
+    public static final String[] PROJECTION_NOTE = new String[] {
+            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
+            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
+            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
+            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
+            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
+            NoteColumns.VERSION
+    };
+
+    public static final int ID_COLUMN = 0;
+
+    public static final int ALERTED_DATE_COLUMN = 1;
+
+    public static final int BG_COLOR_ID_COLUMN = 2;
+
+    public static final int CREATED_DATE_COLUMN = 3;
+
+    public static final int HAS_ATTACHMENT_COLUMN = 4;
+
+    public static final int MODIFIED_DATE_COLUMN = 5;
+
+    public static final int NOTES_COUNT_COLUMN = 6;
+
+    public static final int PARENT_ID_COLUMN = 7;
+
+    public static final int SNIPPET_COLUMN = 8;
+
+    public static final int TYPE_COLUMN = 9;
+
+    public static final int WIDGET_ID_COLUMN = 10;
+
+    public static final int WIDGET_TYPE_COLUMN = 11;
+
+    public static final int SYNC_ID_COLUMN = 12;
+
+    public static final int LOCAL_MODIFIED_COLUMN = 13;
+
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
+
+    public static final int GTASK_ID_COLUMN = 15;
+
+    public static final int VERSION_COLUMN = 16;
+
+    private Context mContext;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mIsCreate;
+
+    private long mId;
+
+    private long mAlertDate;
+
+    private int mBgColorId;
+
+    private long mCreatedDate;
+
+    private int mHasAttachment;
+
+    private long mModifiedDate;
+
+    private long mParentId;
+
+    private String mSnippet;
+
+    private int mType;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mOriginParent;
+
+    private long mVersion;
+
+    private ContentValues mDiffNoteValues;
+
+    private ArrayList<SqlData> mDataList;
+
+    public SqlNote(Context context) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mId = INVALID_ID;
+        mAlertDate = 0;
+        mBgColorId = ResourceParser.getDefaultBgId(context);
+        mCreatedDate = System.currentTimeMillis();
+        mHasAttachment = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mParentId = 0;
+        mSnippet = "";
+        mType = Notes.TYPE_NOTE;
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+        mOriginParent = 0;
+        mVersion = 0;
+        mDiffNoteValues = new ContentValues();
+        mDataList = new ArrayList<SqlData>();
+    }
+
+    public SqlNote(Context context, Cursor c) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+    }
+
+    public SqlNote(Context context, long id) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(id);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+
+    }
+
+    private void loadFromCursor(long id) {
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(id)
+                    }, null);
+            if (c != null) {
+                c.moveToNext();
+                loadFromCursor(c);
+            } else {
+                Log.w(TAG, "loadFromCursor: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    private void loadFromCursor(Cursor c) {
+        mId = c.getLong(ID_COLUMN);
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
+        mParentId = c.getLong(PARENT_ID_COLUMN);
+        mSnippet = c.getString(SNIPPET_COLUMN);
+        mType = c.getInt(TYPE_COLUMN);
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
+        mVersion = c.getLong(VERSION_COLUMN);
+    }
+
+    private void loadDataContent() {
+        Cursor c = null;
+        mDataList.clear();
+        try {
+            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
+                    "(note_id=?)", new String[] {
+                        String.valueOf(mId)
+                    }, null);
+            if (c != null) {
+                if (c.getCount() == 0) {
+                    Log.w(TAG, "it seems that the note has not data");
+                    return;
+                }
+                while (c.moveToNext()) {
+                    SqlData data = new SqlData(mContext, c);
+                    mDataList.add(data);
+                }
+            } else {
+                Log.w(TAG, "loadDataContent: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    public boolean setContent(JSONObject js) {
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                Log.w(TAG, "cannot set system folder");
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                // for folder we can only update the snnipet and type
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
+                if (mIsCreate || mId != id) {
+                    mDiffNoteValues.put(NoteColumns.ID, id);
+                }
+                mId = id;
+
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
+                        .getLong(NoteColumns.ALERTED_DATE) : 0;
+                if (mIsCreate || mAlertDate != alertDate) {
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                }
+                mAlertDate = alertDate;
+
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
+                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
+                if (mIsCreate || mBgColorId != bgColorId) {
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
+                }
+                mBgColorId = bgColorId;
+
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
+                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mCreatedDate != createDate) {
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                }
+                mCreatedDate = createDate;
+
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
+                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
+                if (mIsCreate || mHasAttachment != hasAttachment) {
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                }
+                mHasAttachment = hasAttachment;
+
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
+                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mModifiedDate != modifiedDate) {
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                }
+                mModifiedDate = modifiedDate;
+
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note
+                        .getLong(NoteColumns.PARENT_ID) : 0;
+                if (mIsCreate || mParentId != parentId) {
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                }
+                mParentId = parentId;
+
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
+                        : AppWidgetManager.INVALID_APPWIDGET_ID;
+                if (mIsCreate || mWidgetId != widgetId) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
+                }
+                mWidgetId = widgetId;
+
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
+                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
+                if (mIsCreate || mWidgetType != widgetType) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
+                }
+                mWidgetType = widgetType;
+
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
+                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
+                if (mIsCreate || mOriginParent != originParent) {
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
+                }
+                mOriginParent = originParent;
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    SqlData sqlData = null;
+                    if (data.has(DataColumns.ID)) {
+                        long dataId = data.getLong(DataColumns.ID);
+                        for (SqlData temp : mDataList) {
+                            if (dataId == temp.getId()) {
+                                sqlData = temp;
+                            }
+                        }
+                    }
+
+                    if (sqlData == null) {
+                        sqlData = new SqlData(mContext);
+                        mDataList.add(sqlData);
+                    }
+
+                    sqlData.setContent(data);
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+
+    public JSONObject getContent() {
+        try {
+            JSONObject js = new JSONObject();
+
+            if (mIsCreate) {
+                Log.e(TAG, "it seems that we haven't created this in database yet");
+                return null;
+            }
+
+            JSONObject note = new JSONObject();
+            if (mType == Notes.TYPE_NOTE) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
+                note.put(NoteColumns.PARENT_ID, mParentId);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.WIDGET_ID, mWidgetId);
+                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
+                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+
+                JSONArray dataArray = new JSONArray();
+                for (SqlData sqlData : mDataList) {
+                    JSONObject data = sqlData.getContent();
+                    if (data != null) {
+                        dataArray.put(data);
+                    }
+                }
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+            }
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public void setParentId(long id) {
+        mParentId = id;
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+    }
+
+    public void setGtaskId(String gid) {
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+    }
+
+    public void setSyncId(long syncId) {
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+    }
+
+    public void resetLocalModified() {
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public long getParentId() {
+        return mParentId;
+    }
+
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    public boolean isNoteType() {
+        return mType == Notes.TYPE_NOTE;
+    }
+
+    public void commit(boolean validateVersion) {
+        if (mIsCreate) {
+            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
+                mDiffNoteValues.remove(NoteColumns.ID);
+            }
+
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            try {
+                mId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+            if (mId == 0) {
+                throw new IllegalStateException("Create thread id failed");
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, false, -1);
+                }
+            }
+        } else {
+            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
+                Log.e(TAG, "No such note");
+                throw new IllegalStateException("Try to update note with invalid id");
+            }
+            if (mDiffNoteValues.size() > 0) {
+                mVersion ++;
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?)", new String[] {
+                        String.valueOf(mId)
+                    });
+                } else {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
+                            new String[] {
+                                    String.valueOf(mId), String.valueOf(mVersion)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, validateVersion, mVersion);
+                }
+            }
+        }
+
+        // refresh local info
+        loadFromCursor(mId);
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+
+        mDiffNoteValues.clear();
+        mIsCreate = false;
+    }
+}

src/Task.java

@@ -0,0 +1,334 @@
+/*
+ * 版权所有 (c) 2010-2011, MiCode 开源社区 (www.micode.net)
+ *
+ * 根据 Apache License, Version 2.0 (以下简称“许可协议”) 授权;
+ * 除非遵守许可协议，否则不得使用此文件。
+ * 您可以在以下网址获取许可协议的副本：
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 除非适用法律要求或书面同意，根据许可协议分发的软件按“原样”提供，
+ * 不提供任何明示或暗示的担保或条件。
+ * 请参阅许可协议了解许可权限及限制。
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+// 任务类，继承自节点类
+public class Task extends Node {
+    private static final String TAG = Task.class.getSimpleName(); // 日志标签
+    private boolean mCompleted; // 任务完成标记
+    private String mNotes; // 任务的备注
+    private JSONObject mMetaInfo; // 任务的元信息
+    private Task mPriorSibling; // 前一个兄弟任务
+    private TaskList mParent; // 任务的父任务列表
+
+    // 构造方法，初始化任务属性
+    public Task() {
+        super();
+        mCompleted = false;
+        mNotes = null;
+        mPriorSibling = null;
+        mParent = null;
+        mMetaInfo = null;
+    }
+
+    // 创建任务的 JSON 对象
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // 设置动作类型为创建
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // 设置动作 ID
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // 设置任务的索引
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
+
+            // 设置实体数据
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+            // 设置父任务 ID
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
+
+            // 设置父任务类型
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+
+            // 设置任务列表 ID
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
+
+            // 设置前一个兄弟任务 ID
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("创建任务 JSON 对象失败");
+        }
+
+        return js;
+    }
+
+    // 更新任务的 JSON 对象
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("更新任务 JSON 对象失败");
+        }
+
+        return js;
+    }
+
+    // 从远程 JSON 设置任务内容
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("从 JSON 获取任务内容失败");
+            }
+        }
+    }
+
+    // 从本地 JSON 设置任务内容
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
+            Log.w(TAG, "setContentByLocalJSON: 数据为空");
+        }
+
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
+                Log.e(TAG, "无效类型");
+                return;
+            }
+
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i);
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT));
+                    break;
+                }
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    // 获取本地 JSON 内容
+    public JSONObject getLocalJSONFromContent() {
+        String name = getName();
+        try {
+            if (mMetaInfo == null) {
+                if (name == null) {
+                    Log.w(TAG, "笔记为空");
+                    return null;
+                }
+                JSONObject js = new JSONObject();
+                JSONObject note = new JSONObject();
+                JSONArray dataArray = new JSONArray();
+                JSONObject data = new JSONObject();
+                data.put(DataColumns.CONTENT, name);
+                dataArray.put(data);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+                return js;
+            } else {
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName());
+                        break;
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                return mMetaInfo;
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 设置元信息
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) {
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes());
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                mMetaInfo = null;
+            }
+        }
+    }
+
+    // 获取同步操作
+    public int getSyncAction(Cursor c) {
+        try {
+            JSONObject noteInfo = null;
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            }
+
+            if (noteInfo == null) {
+                Log.w(TAG, "笔记元数据已删除");
+                return SYNC_ACTION_UPDATE_REMOTE;
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) {
+                Log.w(TAG, "远程笔记 ID 似乎被删除");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "笔记 ID 不匹配");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    return SYNC_ACTION_NONE;
+                } else {
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask ID 不匹配");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    return SYNC_ACTION_UPDATE_CONFLICT;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    // 检查任务是否值得保存
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0);
+    }
+
+    // 设置任务完成状态
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed;
+    }
+
+    // 设置备注
+    public void setNotes(String notes) {
+        this.mNotes = notes;
+    }
+
+    // 设置前一个兄弟任务
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling;
+    }
+
+    // 设置父任务列表
+    public void setParent(TaskList parent) {
+        this.mParent = parent;
+    }
+
+    // 获取任务完成状态
+    public boolean getCompleted() {
+        return this.mCompleted;
+    }
+
+    // 获取备注
+    public String getNotes() {
+        return this.mNotes;
+    }
+
+    // 获取前一个兄弟任务
+    public Task getPriorSibling() {
+        return this.mPriorSibling;
+    }
+
+    // 获取父任务列表
+    public TaskList getParent() {
+        return this.mParent;
+    }
+}

src/TaskList.java

@@ -0,0 +1,351 @@
+/*
+ * 版权所有 (c) 2010-2011, MiCode 开源社区 (www.micode.net)
+ *
+ * 根据 Apache 许可证 2.0 版授权 ("许可证");
+ * 只有在符合许可证的情况下，您才能使用此文件。
+ * 您可以在以下位置获取许可证副本：
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 除非适用法律要求或书面同意，按“原样”分发的许可证软件，
+ * 无任何明示或暗示的担保或条件。
+ * 请参阅许可证以获取许可下的具体语言和限制。
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+/**
+ * 任务列表类，继承自节点类
+ */
+public class TaskList extends Node {
+    private static final String TAG = TaskList.class.getSimpleName(); // 日志标签
+
+    private int mIndex; // 索引号
+
+    private ArrayList<Task> mChildren; // 子任务列表
+
+    // 构造函数
+    public TaskList() {
+        super();
+        mChildren = new ArrayList<Task>();
+        mIndex = 1;
+    }
+
+    /**
+     * 创建任务列表的JSON对象
+     * @param actionId 动作ID
+     * @return 创建的JSON对象
+     */
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE); // 动作类型
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 动作ID
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex); // 索引
+
+            // 设置实体信息
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 名称
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null"); // 创建者ID
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE, GTaskStringUtils.GTASK_JSON_TYPE_GROUP); // 实体类型
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("生成任务列表创建JSON对象失败");
+        }
+        return js;
+    }
+
+    /**
+     * 更新任务列表的JSON对象
+     * @param actionId 动作ID
+     * @return 更新的JSON对象
+     */
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+        try {
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE); // 动作类型
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId); // 动作ID
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid()); // 任务ID
+
+            // 设置实体信息
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName()); // 名称
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted()); // 删除状态
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("生成任务列表更新JSON对象失败");
+        }
+        return js;
+    }
+
+    /**
+     * 从远程JSON设置任务列表内容
+     */
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID)); // 设置ID
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)); // 设置最后修改时间
+                }
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME)); // 设置名称
+                }
+
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("从JSON对象获取任务列表内容失败");
+            }
+        }
+    }
+
+    /**
+     * 从本地JSON设置任务列表内容
+     */
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+            Log.w(TAG, "setContentByLocalJSON: 无可用内容");
+            return;
+        }
+
+        try {
+            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+
+            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                String name = folder.getString(NoteColumns.SNIPPET);
+                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
+            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
+                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE);
+                else
+                    Log.e(TAG, "无效的系统文件夹");
+            } else {
+                Log.e(TAG, "错误的类型");
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 获取任务列表内容并转换为本地JSON对象
+     */
+    public JSONObject getLocalJSONFromContent() {
+        try {
+            JSONObject js = new JSONObject();
+            JSONObject folder = new JSONObject();
+            String folderName = getName();
+
+            // 处理文件夹名称
+            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)) {
+                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length());
+            }
+
+            folder.put(NoteColumns.SNIPPET, folderName);
+            folder.put(NoteColumns.TYPE, folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
+                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE)
+                    ? Notes.TYPE_SYSTEM : Notes.TYPE_FOLDER);
+
+            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * 根据游标信息获取同步操作类型
+     */
+    public int getSyncAction(Cursor c) {
+        try {
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // 没有本地更新
+                return c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified() ? SYNC_ACTION_NONE : SYNC_ACTION_UPDATE_LOCAL;
+            } else {
+                // 验证任务ID
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "任务ID不匹配");
+                    return SYNC_ACTION_ERROR;
+                }
+                return c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified() ? SYNC_ACTION_UPDATE_REMOTE : SYNC_ACTION_UPDATE_REMOTE;
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return SYNC_ACTION_ERROR;
+    }
+
+    /**
+     * 获取子任务数量
+     */
+    public int getChildTaskCount() {
+        return mChildren.size();
+    }
+
+    /**
+     * 添加子任务
+     */
+    public boolean addChildTask(Task task) {
+        if (task != null && !mChildren.contains(task)) {
+            boolean ret = mChildren.add(task);
+            if (ret) {
+                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren.get(mChildren.size() - 1));
+                task.setParent(this);
+            }
+            return ret;
+        }
+        return false;
+    }
+
+    /**
+     * 添加子任务到指定位置
+     */
+    public boolean addChildTask(Task task, int index) {
+        if (index < 0 || index > mChildren.size()) {
+            Log.e(TAG, "添加子任务：无效索引");
+            return false;
+        }
+        if (task != null && mChildren.indexOf(task) == -1) {
+            mChildren.add(index, task);
+
+            // 更新子任务链
+            Task preTask = index != 0 ? mChildren.get(index - 1) : null;
+            Task afterTask = index != mChildren.size() - 1 ? mChildren.get(index + 1) : null;
+
+            task.setPriorSibling(preTask);
+            if (afterTask != null) {
+                afterTask.setPriorSibling(task);
+            }
+        }
+        return true;
+    }
+
+    /**
+     * 从任务列表中删除子任务
+     */
+    public boolean removeChildTask(Task task) {
+        int index = mChildren.indexOf(task);
+        if (index != -1) {
+            boolean ret = mChildren.remove(task);
+            if (ret) {
+                task.setPriorSibling(null);
+                task.setParent(null);
+
+                // 更新任务链
+                if (index != mChildren.size()) {
+                    mChildren.get(index).setPriorSibling(index == 0 ? null : mChildren.get(index - 1));
+                }
+            }
+            return ret;
+        }
+        return false;
+    }
+
+    /**
+     * 移动子任务到指定位置
+     */
+    public boolean moveChildTask(Task task, int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "移动子任务：无效索引");
+            return false;
+        }
+        int pos = mChildren.indexOf(task);
+        if (pos == -1) {
+            Log.e(TAG, "移动子任务：任务应在列表中");
+            return false;
+        }
+        return pos == index || (removeChildTask(task) && addChildTask(task, index));
+    }
+
+    /**
+     * 通过GID查找子任务
+     */
+    public Task findChildTaskByGid(String gid) {
+        for (Task t : mChildren) {
+            if (t.getGid().equals(gid)) {
+                return t;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 获取子任务的索引
+     */
+    public int getChildTaskIndex(Task task) {
+        return mChildren.indexOf(task);
+    }
+
+    /**
+     * 通过索引获取子任务
+     */
+    public Task getChildTaskByIndex(int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "getTaskByIndex: 无效索引");
+            return null;
+        }
+        return mChildren.get(index);
+    }
+
+    /**
+     * 通过GID获取子任务
+     */
+    public Task getChilTaskByGid(String gid) {
+        for (Task task : mChildren) {
+            if (task.getGid().equals(gid)) {
+                return task;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 获取子任务列表
+     */
+    public ArrayList<Task> getChildTaskList() {
+        return this.mChildren;
+    }
+
+    /**
+     * 设置索引
+     */
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+    /**
+     * 获取索引
+     */
+    public int getIndex() {
+        return this.mIndex;
+    }
+}