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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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* SqlData类用于处理与笔记数据相关的数据库操作
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* 提供了从数据库加载、保存数据以及与JSON格式互相转换的功能
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* 支持增量更新机制，仅提交发生变化的数据字段
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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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// 无效ID常量，用于标记未初始化的ID
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private static final int INVALID_ID = -99999;
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// 数据查询投影，定义了从数据库查询数据时需要返回的列
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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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// 投影列索引常量，方便从Cursor中获取对应列的数据
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public static final int DATA_ID_COLUMN = 0;
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public static final int DATA_MIME_TYPE_COLUMN = 1;
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public static final int DATA_CONTENT_COLUMN = 2;
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public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
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public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
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// 内容解析器，用于与内容提供者交互
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private ContentResolver mContentResolver;
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// 是否为新创建的数据
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private boolean mIsCreate;
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// 数据ID
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private long mDataId;
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// 数据MIME类型
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private String mDataMimeType;
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// 数据内容
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private String mDataContent;
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// 额外数据字段1
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private long mDataContentData1;
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// 额外数据字段3
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private String mDataContentData3;
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// 存储发生变化的数据字段，用于增量更新
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private ContentValues mDiffDataValues;
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/**
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* 构造函数，创建一个新的SqlData对象
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* @param context 应用上下文
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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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/**
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* 构造函数，从数据库游标创建SqlData对象
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* @param context 应用上下文
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* @param c 包含数据的游标
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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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/**
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* 从数据库游标加载数据
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* @param c 包含数据的游标
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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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* 从JSON对象设置数据内容
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* 只会将发生变化的字段添加到差异值集合中
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* @param js 包含数据的JSON对象
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* @throws JSONException JSON解析异常
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*/
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public void setContent(JSONObject js) throws JSONException {
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// 处理数据ID
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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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// 处理MIME类型
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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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// 处理内容字段
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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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// 处理额外数据字段1
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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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// 处理额外数据字段3
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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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/**
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* 将数据内容转换为JSON对象
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* @return 包含数据的JSON对象
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* @throws JSONException JSON构建异常
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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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* 将数据提交到数据库
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* 支持创建新记录和更新已有记录
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* @param noteId 关联的笔记ID
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* @param validateVersion 是否验证版本
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* @param version 版本号
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*/
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public void commit(long noteId, boolean validateVersion, long version) {
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if (mIsCreate) {
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// 创建新记录时，如果ID无效且已设置，则移除ID设置
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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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// 设置关联的笔记ID
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mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
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// 插入新记录
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Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
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try {
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// 从返回的URI中获取新记录的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 {
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// 更新已有记录
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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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// 不验证版本时直接更新
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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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// 验证版本时使用更严格的条件更新
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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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// 清空差异值集合，重置创建标志
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mDiffDataValues.clear();
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mIsCreate = false;
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}
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/**
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* 获取数据ID
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* @return 数据ID
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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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