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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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/**
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*管理便签应用中的数据项（如文本、图片等），
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* 负责数据项的加载、从JSON解析数据、生成JSON数据、数据库交互（插入 / 更新）及版本冲突控制，
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* 是便签数据在内存与数据库之间的中间层处理类。
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*/
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public class SqlData {
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private static final String TAG = SqlData.class.getSimpleName();
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private static final int INVALID_ID = -99999;
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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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public static final int DATA_ID_COLUMN = 0;
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//区分数据项，比如文本、图片、附件等，由此决定数据解析方式
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public static final int DATA_MIME_TYPE_COLUMN = 1;
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//存储数据项的核心内容
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public static final int DATA_CONTENT_COLUMN = 2;
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//存储content辅助信息，比如图片的宽度大小等
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public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
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//更多扩展信息
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public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
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private ContentResolver mContentResolver;
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//false表示新创建的未入库数据项，true表示数据库中已经创建的数据项
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private boolean mIsCreate;
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private long mDataId;
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private String mDataMimeType;
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private String mDataContent;
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private long mDataContentData1;
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private String mDataContentData3;
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private ContentValues mDiffDataValues;
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/**
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* mContentResolver是什么？
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* @param context
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*/
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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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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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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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/**
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* 将JSON中的数据项属性映射到SqlData实例的成员变量，
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* 记录变更的字段到mDifferentValues中，为后续数据库增量更新做准备
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* 数据序列化，JSON js->实例
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* @param js
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* @throws JSONException
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*/
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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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//新创建的未入库数据项或者是当前实例的已有ID和JSON中解析的ID不一样，说明该字段发生了变更
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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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//判断JSON中是否包含MIME_TYPE键，否则默认为纯文本
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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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//判断JSON中是否包含CONTENT键，如便签文本等，否则赋值为空串
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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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//判断DATA1键，如图片宽度等
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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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//判断DATA3键
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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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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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/**
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* 将数据项提交到数据库，根据数据项是否为新建，分别执行插入或者更新操作，同时支持版本验证，
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* 最终清理变更记录，更新实例状态
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* @param noteId 数据项关联的便签ID
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* @param validateVersion 版本验证布尔值，防止多人或者多设备同时改，避免改乱
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* @param version 要验证的版本号
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*/
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public void commit(long noteId, boolean validateVersion, long version) {
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//新创建的项，“插入”
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if (mIsCreate) {
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//未入库，数据库未生成主键，所以当前数据项ID为无效值
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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 { //从数据库返回的地址里抠出数据项的ID
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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 { //数据库里本来就有这个项，只是更改内容
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if (mDiffDataValues.size() > 0) {
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int result = 0;
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//不需要防止多设备更改冲突
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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 { //需要防止多设备更改冲突
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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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public long getId() {
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return mDataId;
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}
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}
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