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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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public class SqlData {//公开类， 数据库类
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private static final String TAG = SqlData.class.getSimpleName();
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//调用getSimpleName ()函数来得到类的简写名称存入字符串TAG中
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private static final int INVALID_ID = -99999;
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public static final String[] PROJECTION_DATA = new String[] {//新建一个字符串数组，集合了 interface DataColumns 中所有SF常量
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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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//代码块：与sqlNote中定义的常量是相类似的，是一些列的序号
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public static final int DATA_ID_COLUMN = 0;
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//数据列的这一行表示的项的mime类型
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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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private ContentResolver mContentResolver;
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//定义以下8个内部变量
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private boolean mIsCreate;
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//判断是否直接用Content生成，是为true，否则为false
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private long mDataId;
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private String mDataMimeType;
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//数据mime类型
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private String mDataContent;
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//数据内容
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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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//contenvalues只能存储基本类型的数据，像string，int之类的
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public SqlData(Context context) {//构造函数，初始化数据，参数类型为Context
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mContentResolver = context.getContentResolver();
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mIsCreate = true;//mIsCreate为TRUE是这种构造方式的标志
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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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//第二种SqlData的构造方式，通过cursor来获取数据
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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) {//构造函数，初始化数据，参数类型分别为 Context 和 Cursor
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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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public void setContent(JSONObject js) throws JSONException {//设置用于共享的数据，并提供异常抛出与处理机制，其中很多if 条件语句的判断，某些条件下某些特定的操作
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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)//如果传入的JSONObject对象有DataColumns.MIME_TYPE一项，则设置dataMimeType为这个，否则设为SqlData.java
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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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//以原有数据文本类型为基础，修改共享数据文本类型
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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;//共享数据同步后，共享1类型数据等于该1类型数据
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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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//获取共享数据内容及提供异常抛出与处理机制
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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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//将当前数据提交到数据库
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public void commit(long noteId, boolean validateVersion, long version) {
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//commit 函数用于把当前所做的修改保存到数据库
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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);//更新共享数据，键为NOTE_ID，值为noteId
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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) {//如果版本还没确认，则结果记录下的只是data的ID，还有data内容
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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(//若版本号确认，则对对应id进行更新，
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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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});//更新不存在，可能是用户在同步时已更新
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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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}//如果更新不存在（或许用户在同步时已经完成更新），则报错c
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}
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}
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mDiffDataValues.clear();//回到初始化，清空，表示已经更新
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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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}//获取当前id
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}
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