|
|
/*
|
|
|
* 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;
|
|
|
|
|
|
/**
|
|
|
* 数据库数据操作封装类
|
|
|
*
|
|
|
* 主要功能：
|
|
|
* - 封装对笔记内容数据表(Data表)的CRUD操作
|
|
|
* - 支持通过JSON进行数据序列化和反序列化
|
|
|
* - 实现差异更新机制，只提交修改过的字段
|
|
|
* - 提供版本验证的数据提交功能
|
|
|
*
|
|
|
* 核心特点：
|
|
|
* - 自动区分创建和更新操作
|
|
|
* - 维护修改字段的差异集合(mDiffDataValues)
|
|
|
* - 支持事务性提交(带版本校验)
|
|
|
*/
|
|
|
public class SqlData {
|
|
|
private static final String TAG = SqlData.class.getSimpleName();
|
|
|
|
|
|
private static final int INVALID_ID = -99999;
|
|
|
|
|
|
public static final String[] PROJECTION_DATA = new String[] {
|
|
|
DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
|
|
|
DataColumns.DATA3
|
|
|
};
|
|
|
// 0:数据ID 1:MIME类型 2:内容主体 3:扩展数据1(长整型) 4:扩展数据3(字符串)
|
|
|
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
|
|
|
|
|
|
private boolean mIsCreate;// 是否新建记录标记
|
|
|
|
|
|
private long mDataId;// 数据ID
|
|
|
|
|
|
private String mDataMimeType; // MIME类型
|
|
|
|
|
|
private String mDataContent; // 内容主体
|
|
|
|
|
|
private long mDataContentData1;// 扩展数据1
|
|
|
|
|
|
private String mDataContentData3; // 扩展数据3
|
|
|
|
|
|
private ContentValues mDiffDataValues;// 差异字段集合
|
|
|
/**
|
|
|
* 新建记录构造方法
|
|
|
* @param context 上下文对象
|
|
|
* 初始化状态：
|
|
|
* - 标记为创建状态(mIsCreate=true)
|
|
|
* - 设置默认MIME类型为普通笔记
|
|
|
* - 初始化所有字段为空/默认值
|
|
|
*/
|
|
|
public SqlData(Context context) {
|
|
|
mContentResolver = context.getContentResolver();
|
|
|
mIsCreate = true;
|
|
|
mDataId = INVALID_ID;
|
|
|
mDataMimeType = DataConstants.NOTE;
|
|
|
mDataContent = "";
|
|
|
mDataContentData1 = 0;
|
|
|
mDataContentData3 = "";
|
|
|
mDiffDataValues = new ContentValues();
|
|
|
}
|
|
|
/**
|
|
|
* 从数据库游标构造
|
|
|
* @param context 上下文
|
|
|
* @param c 数据库游标(必须包含PROJECTION_DATA指定字段)
|
|
|
* 初始化状态：
|
|
|
* - 标记为更新状态(mIsCreate=false)
|
|
|
* - 从游标加载现有数据
|
|
|
*/
|
|
|
public SqlData(Context context, Cursor c) {
|
|
|
mContentResolver = context.getContentResolver();
|
|
|
mIsCreate = false;
|
|
|
loadFromCursor(c);
|
|
|
mDiffDataValues = new ContentValues();
|
|
|
}
|
|
|
|
|
|
private void loadFromCursor(Cursor c) {
|
|
|
mDataId = c.getLong(DATA_ID_COLUMN);
|
|
|
mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
|
|
|
mDataContent = c.getString(DATA_CONTENT_COLUMN);
|
|
|
mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
|
|
|
mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
|
|
|
}
|
|
|
/**
|
|
|
* 从JSON设置内容(反序列化)
|
|
|
* @param js 包含数据的JSON对象
|
|
|
* 实现机制：
|
|
|
* - 比较新旧值，将变化的字段存入mDiffDataValues
|
|
|
* - 对于新建记录，所有字段都视为有变化
|
|
|
*/
|
|
|
public void setContent(JSONObject js) throws JSONException {
|
|
|
long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
|
|
|
if (mIsCreate || mDataId != dataId) {
|
|
|
mDiffDataValues.put(DataColumns.ID, dataId);
|
|
|
}
|
|
|
mDataId = dataId;
|
|
|
|
|
|
String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
|
|
|
: DataConstants.NOTE;
|
|
|
if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
|
|
|
mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
|
|
|
}
|
|
|
mDataMimeType = dataMimeType;
|
|
|
|
|
|
String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
|
|
|
if (mIsCreate || !mDataContent.equals(dataContent)) {
|
|
|
mDiffDataValues.put(DataColumns.CONTENT, dataContent);
|
|
|
}
|
|
|
mDataContent = dataContent;
|
|
|
|
|
|
long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
|
|
|
if (mIsCreate || mDataContentData1 != dataContentData1) {
|
|
|
mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
|
|
|
}
|
|
|
mDataContentData1 = dataContentData1;
|
|
|
|
|
|
String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
|
|
|
if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
|
|
|
mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
|
|
|
}
|
|
|
mDataContentData3 = dataContentData3;
|
|
|
}
|
|
|
/**
|
|
|
* 获取JSON格式内容(序列化)
|
|
|
* @return 包含当前数据的JSON对象
|
|
|
* @throws JSONException 序列化异常
|
|
|
* 注意：
|
|
|
* - 新建状态不能调用此方法
|
|
|
*/
|
|
|
public JSONObject getContent() throws JSONException {
|
|
|
if (mIsCreate) {
|
|
|
Log.e(TAG, "it seems that we haven't created this in database yet");
|
|
|
return null;
|
|
|
}
|
|
|
JSONObject js = new JSONObject();
|
|
|
js.put(DataColumns.ID, mDataId);
|
|
|
js.put(DataColumns.MIME_TYPE, mDataMimeType);
|
|
|
js.put(DataColumns.CONTENT, mDataContent);
|
|
|
js.put(DataColumns.DATA1, mDataContentData1);
|
|
|
js.put(DataColumns.DATA3, mDataContentData3);
|
|
|
return js;
|
|
|
}
|
|
|
/**
|
|
|
* 提交数据到数据库
|
|
|
* @param noteId 关联的笔记ID
|
|
|
* @param validateVersion 是否验证版本
|
|
|
* @param version 预期版本号
|
|
|
* 处理逻辑：
|
|
|
* - 新建记录：执行insert操作
|
|
|
* - 更新记录：根据validateVersion决定是否校验版本
|
|
|
* - 只提交有变化的字段(mDiffDataValues)
|
|
|
*/
|
|
|
public void commit(long noteId, boolean validateVersion, long version) {
|
|
|
|
|
|
if (mIsCreate) {
|
|
|
if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
|
|
|
mDiffDataValues.remove(DataColumns.ID);
|
|
|
}
|
|
|
|
|
|
mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
|
|
|
Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
|
|
|
try {
|
|
|
mDataId = Long.valueOf(uri.getPathSegments().get(1));
|
|
|
} catch (NumberFormatException e) {
|
|
|
Log.e(TAG, "Get note id error :" + e.toString());
|
|
|
throw new ActionFailureException("create note failed");
|
|
|
}
|
|
|
} else {
|
|
|
if (mDiffDataValues.size() > 0) {
|
|
|
int result = 0;
|
|
|
if (!validateVersion) {
|
|
|
result = mContentResolver.update(ContentUris.withAppendedId(
|
|
|
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
|
|
|
} else {
|
|
|
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");
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
mDiffDataValues.clear();
|
|
|
mIsCreate = false;
|
|
|
}
|
|
|
|
|
|
public long getId() {
|
|
|
return mDataId;
|
|
|
}
|
|
|
}
|
