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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.gtask.data;
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import android.content.ContentResolver;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.net.Uri;
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import android.util.Log;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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import net.micode.notes.gtask.exception.ActionFailureException;
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import org.json.JSONException;
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import org.json.JSONObject;
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// SqlData类，可能用于处理与数据库相关的数据操作，比如从数据库读取数据、将数据更新到数据库以及和JSON数据的相互转换等
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public class SqlData {
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// 用于日志记录的标签，使用类的简单名称，方便在日志中识别该类相关的输出信息
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private static final String TAG = SqlData.class.getSimpleName();
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// 定义一个表示无效ID的值，可能用于初始化或者标记不符合要求的ID情况
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private static final int INVALID_ID = -99999;
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// 定义查询数据时要获取的列名数组，用于指定从数据库获取哪些字段的数据
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public static final String[] PROJECTION_DATA = new String[] {
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DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
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DataColumns.DATA3
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};
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// 表示在查询结果游标中数据ID列的索引位置，方便从游标中获取对应的数据
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public static final int DATA_ID_COLUMN = 0;
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// 表示在查询结果游标中数据MIME类型列的索引位置
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public static final int DATA_MIME_TYPE_COLUMN = 1;
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// 表示在查询结果游标中数据内容列的索引位置
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public static final int DATA_CONTENT_COLUMN = 2;
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// 表示在查询结果游标中数据特定内容字段DATA1列的索引位置
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public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
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// 表示在查询结果游标中数据特定内容字段DATA3列的索引位置
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public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
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// 用于操作内容提供器，实现和数据库的数据交互，比如查询、插入、更新等操作
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private ContentResolver mContentResolver;
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// 标记是否是创建操作的标志位，true表示正在创建新数据，初始化为true
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private boolean mIsCreate;
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// 存储数据的ID，初始化为无效ID值
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private long mDataId;
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// 存储数据的MIME类型，初始化为默认的笔记类型（从DataConstants.NOTE获取）
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private String mDataMimeType;
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// 存储数据的内容，初始化为空字符串
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private String mDataContent;
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// 存储数据内容中特定的长整型数据（对应DATA1字段），初始化为0
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private long mDataContentData1;
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// 存储数据内容中特定的字符串数据（对应DATA3字段），初始化为空字符串
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private String mDataContentData3;
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// 用于存放要更新到数据库的数据值，类似一个键值对集合，方便批量更新操作
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private ContentValues mDiffDataValues;
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// 构造函数，传入上下文用于获取内容提供器，初始化相关成员变量，通常用于创建新数据的情况
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public SqlData(Context context) {
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mContentResolver = context.getContentResolver();
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mIsCreate = true;
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mDataId = INVALID_ID;
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mDataMimeType = DataConstants.NOTE;
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mDataContent = "";
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mDataContentData1 = 0;
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mDataContentData3 = "";
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mDiffDataValues = new ContentValues();
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}
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// 另一个构造函数，传入上下文和游标，用于从已有的游标数据中加载信息初始化成员变量，通常用于读取现有数据的情况
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public SqlData(Context context, Cursor c) {
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mContentResolver = context.getContentResolver();
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mIsCreate = false;
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loadFromCursor(c);
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mDiffDataValues = new ContentValues();
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}
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// 从游标中加载数据到成员变量的私有方法，按照定义好的列索引位置获取对应的数据赋值给成员变量
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private void loadFromCursor(Cursor c) {
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mDataId = c.getLong(DATA_ID_COLUMN);
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mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
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mDataContent = c.getString(DATA_CONTENT_COLUMN);
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mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
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mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
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}
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// 根据传入的JSON对象设置相关数据成员变量，并将有变化的数据放入mDiffDataValues中，用于后续更新数据库操作
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public void setContent(JSONObject js) throws JSONException {
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long dataId = js.has(DataColumns.ID)? js.getLong(DataColumns.ID) : INVALID_ID;
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if (mIsCreate || mDataId!= dataId) {
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mDiffDataValues.put(DataColumns.ID, dataId);
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}
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mDataId = dataId;
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String dataMimeType = js.has(DataColumns.MIME_TYPE)? js.getString(DataColumns.MIME_TYPE)
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: DataConstants.NOTE;
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if (mIsCreate ||!mDataMimeType.equals(dataMimeType)) {
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mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
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}
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mDataMimeType = dataMimeType;
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String dataContent = js.has(DataColumns.CONTENT)? js.getString(DataColumns.CONTENT) : "";
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if (mIsCreate ||!mDataContent.equals(dataContent)) {
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mDiffDataValues.put(DataColumns.CONTENT, dataContent);
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}
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mDataContent = dataContent;
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long dataContentData1 = js.has(DataColumns.DATA1)? js.getLong(DataColumns.DATA1) : 0;
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if (mIsCreate || mDataContentData1!= dataContentData1) {
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mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
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}
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mDataContentData1 = dataContentData1;
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String dataContentData3 = js.has(DataColumns.DATA3)? js.getString(DataColumns.DATA3) : "";
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if (mIsCreate ||!mDataContentData3.equals(dataContentData3)) {
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mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
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}
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mDataContentData3 = dataContentData3;
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}
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// 根据当前成员变量的数据生成对应的JSON对象，若处于创建状态则记录错误日志并返回null
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public JSONObject getContent() throws JSONException {
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if (mIsCreate) {
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Log.e(TAG, "it seems that we haven't created this in database yet");
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return null;
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}
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JSONObject js = new JSONObject();
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js.put(DataColumns.ID, mDataId);
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js.put(DataColumns.MIME_TYPE, mDataMimeType);
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js.put(DataColumns.CONTENT, mDataContent);
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js.put(DataColumns.DATA1, mDataContentData1);
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js.put(DataColumns.DATA3, mDataContentData3);
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return js;
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}
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// 将数据提交到数据库的方法，根据是否是创建操作执行不同的逻辑，创建则插入数据，否则根据条件更新数据
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public void commit(long noteId, boolean validateVersion, long version) {
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if (mIsCreate) {
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if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
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mDiffDataValues.remove(DataColumns.ID);
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}
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mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
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Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
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try {
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mDataId = Long.valueOf(uri.getPathSegments().get(1));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Get note id error :" + e.toString());
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throw new ActionFailureException("create note failed");
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}
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} else {
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if (mDiffDataValues.size() > 0) {
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int result = 0;
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if (!validateVersion) {
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result = mContentResolver.update(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
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} else {
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result = mContentResolver.update(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
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"? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
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String.valueOf(noteId), String.valueOf(version)
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});
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}
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if (result == 0) {
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Log.w(TAG, "there is no update. maybe user updates note when syncing");
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}
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}
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}
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mDiffDataValues.clear();
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mIsCreate = false;
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}
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// 获取数据ID的方法，外部可调用此方法获取当前对象关联的数据ID
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public long getId() {
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return mDataId;
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}
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} |
