|
|
/*
|
|
|
* 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.data;
|
|
|
|
|
|
import android.app.SearchManager;
|
|
|
import android.content.ContentProvider;
|
|
|
import android.content.ContentUris;
|
|
|
import android.content.ContentValues;
|
|
|
import android.content.Intent;
|
|
|
import android.content.UriMatcher;
|
|
|
import android.database.Cursor;
|
|
|
import android.database.sqlite.SQLiteDatabase;
|
|
|
import android.net.Uri;
|
|
|
import android.text.TextUtils;
|
|
|
import android.util.Log;
|
|
|
|
|
|
import net.micode.notes.R;
|
|
|
import net.micode.notes.data.Notes.DataColumns;
|
|
|
import net.micode.notes.data.Notes.NoteColumns;
|
|
|
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
|
|
|
|
|
|
/**
|
|
|
* NotesProvider是内容提供者类，负责提供与笔记数据的增删改查功能。
|
|
|
* 它通过SQLite数据库进行数据存储，并使用UriMatcher来解析URI请求。
|
|
|
*/
|
|
|
public class NotesProvider extends ContentProvider {
|
|
|
|
|
|
// 定义UriMatcher对象，用于匹配不同类型的URI
|
|
|
private static final UriMatcher mMatcher;
|
|
|
|
|
|
// Notes数据库帮助类，用于操作数据库
|
|
|
private NotesDatabaseHelper mHelper;
|
|
|
|
|
|
// 日志TAG
|
|
|
private static final String TAG = "NotesProvider";
|
|
|
|
|
|
// 定义不同的URI匹配码
|
|
|
private static final int URI_NOTE = 1; // 匹配所有笔记
|
|
|
private static final int URI_NOTE_ITEM = 2; // 匹配单个笔记
|
|
|
private static final int URI_DATA = 3; // 匹配所有数据
|
|
|
private static final int URI_DATA_ITEM = 4; // 匹配单个数据
|
|
|
private static final int URI_SEARCH = 5; // 匹配搜索请求
|
|
|
private static final int URI_SEARCH_SUGGEST = 6; // 匹配搜索建议请求
|
|
|
|
|
|
// 静态代码块，用于初始化UriMatcher
|
|
|
static {
|
|
|
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配笔记URI
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配具体的笔记
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配数据URI
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配具体的数据
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索
|
|
|
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议
|
|
|
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* SQL查询片段，用于从笔记中搜索，删除换行符并裁剪空格，以显示更多信息。
|
|
|
*/
|
|
|
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
|
|
|
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
|
|
|
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
|
|
|
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
|
|
|
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
|
|
|
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
|
|
|
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
|
|
|
|
|
|
// SQL查询，用于搜索笔记内容中的摘要
|
|
|
private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
|
|
|
+ " FROM " + TABLE.NOTE
|
|
|
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
|
|
|
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
|
|
|
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
|
|
|
|
|
|
/**
|
|
|
* 创建ContentProvider实例时调用。
|
|
|
* 主要用于初始化数据库帮助类实例。
|
|
|
*/
|
|
|
@Override
|
|
|
public boolean onCreate() {
|
|
|
mHelper = NotesDatabaseHelper.getInstance(getContext());
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 处理查询请求。
|
|
|
*
|
|
|
* @param uri 查询的URI
|
|
|
* @param projection 查询的列
|
|
|
* @param selection 查询的条件
|
|
|
* @param selectionArgs 查询条件的参数
|
|
|
* @param sortOrder 排序方式
|
|
|
* @return 返回Cursor，表示查询结果
|
|
|
*/
|
|
|
@Override
|
|
|
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
|
|
|
Cursor c = null;
|
|
|
SQLiteDatabase db = mHelper.getReadableDatabase();
|
|
|
String id = null;
|
|
|
|
|
|
// 根据URI匹配码执行不同的查询操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE: // 查询所有笔记
|
|
|
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM: // 查询单个笔记
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_DATA: // 查询所有数据
|
|
|
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_DATA_ITEM: // 查询单个数据
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_SEARCH: // 搜索笔记
|
|
|
case URI_SEARCH_SUGGEST: // 搜索建议
|
|
|
if (sortOrder != null || projection != null) {
|
|
|
throw new IllegalArgumentException("do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
|
|
|
}
|
|
|
String searchString = null;
|
|
|
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
|
|
|
if (uri.getPathSegments().size() > 1) {
|
|
|
searchString = uri.getPathSegments().get(1);
|
|
|
}
|
|
|
} else {
|
|
|
searchString = uri.getQueryParameter("pattern");
|
|
|
}
|
|
|
if (TextUtils.isEmpty(searchString)) {
|
|
|
return null;
|
|
|
}
|
|
|
try {
|
|
|
searchString = String.format("%%%s%%", searchString); // 添加通配符进行模糊查询
|
|
|
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
|
|
|
} catch (IllegalStateException ex) {
|
|
|
Log.e(TAG, "got exception: " + ex.toString());
|
|
|
}
|
|
|
break;
|
|
|
default:
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
|
|
|
}
|
|
|
|
|
|
// 如果Cursor不为空，设置通知URI，监听数据变化
|
|
|
if (c != null) {
|
|
|
c.setNotificationUri(getContext().getContentResolver(), uri);
|
|
|
}
|
|
|
return c;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 处理插入请求。
|
|
|
*
|
|
|
* @param uri 插入的URI
|
|
|
* @param values 要插入的数据
|
|
|
* @return 返回新插入记录的URI
|
|
|
*/
|
|
|
@Override
|
|
|
public Uri insert(Uri uri, ContentValues values) {
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
long dataId = 0, noteId = 0, insertedId = 0;
|
|
|
|
|
|
// 根据URI匹配码执行不同的插入操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE: // 插入一条笔记
|
|
|
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
|
|
|
break;
|
|
|
case URI_DATA: // 插入一条数据
|
|
|
if (values.containsKey(DataColumns.NOTE_ID)) {
|
|
|
noteId = values.getAsLong(DataColumns.NOTE_ID);
|
|
|
} else {
|
|
|
Log.d(TAG, "Wrong data format without note id:" + values.toString());
|
|
|
}
|
|
|
insertedId = dataId = db.insert(TABLE.DATA, null, values);
|
|
|
break;
|
|
|
default:
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
|
|
|
}
|
|
|
|
|
|
// 通知数据改变
|
|
|
if (noteId > 0) {
|
|
|
getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
|
|
|
}
|
|
|
if (dataId > 0) {
|
|
|
getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
|
|
|
}
|
|
|
return ContentUris.withAppendedId(uri, insertedId); // 返回新记录的URI
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 处理删除请求。
|
|
|
*
|
|
|
* @param uri 删除的URI
|
|
|
* @param selection 删除的条件
|
|
|
* @param selectionArgs 删除条件的参数
|
|
|
* @return 返回删除的记录数
|
|
|
*/
|
|
|
@Override
|
|
|
public int delete(Uri uri, String selection, String[] selectionArgs) {
|
|
|
int count = 0;
|
|
|
String id = null;
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
boolean deleteData = false;
|
|
|
|
|
|
// 根据URI匹配码执行不同的删除操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE: // 删除笔记
|
|
|
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
|
|
|
count = db.delete(TABLE.NOTE, selection, selectionArgs);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM: // 删除单个笔记
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
long noteId = Long.valueOf(id);
|
|
|
if (noteId <= 0) { // 如果笔记ID小于等于0，不允许删除
|
|
|
break;
|
|
|
}
|
|
|
count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
break;
|
|
|
case URI_DATA: // 删除数据
|
|
|
count = db.delete(TABLE.DATA, selection, selectionArgs);
|
|
|
deleteData = true;
|
|
|
break;
|
|
|
case URI_DATA_ITEM: // 删除单个数据
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
deleteData = true;
|
|
|
break;
|
|
|
default:
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
|
|
|
}
|
|
|
|
|
|
// 如果删除成功，通知数据变化
|
|
|
if (count > 0) {
|
|
|
if (deleteData) {
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
}
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
}
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 处理更新请求。
|
|
|
*
|
|
|
* @param uri 更新的URI
|
|
|
* @param values 更新的内容
|
|
|
* @param selection 更新的条件
|
|
|
* @param selectionArgs 更新条件的参数
|
|
|
* @return 返回更新的记录数
|
|
|
*/
|
|
|
@Override
|
|
|
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
|
|
|
int count = 0;
|
|
|
String id = null;
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
boolean updateData = false;
|
|
|
|
|
|
// 根据URI匹配码执行不同的更新操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE: // 更新笔记
|
|
|
increaseNoteVersion(-1, selection, selectionArgs); // 更新笔记版本
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM: // 更新单个笔记
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 更新指定笔记版本
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
break;
|
|
|
case URI_DATA: // 更新数据
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);
|
|
|
updateData = true;
|
|
|
break;
|
|
|
case URI_DATA_ITEM: // 更新单个数据
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
updateData = true;
|
|
|
break;
|
|
|
default:
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
|
|
|
}
|
|
|
|
|
|
// 如果更新成功，通知数据变化
|
|
|
if (count > 0) {
|
|
|
if (updateData) {
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
}
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
}
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 辅助方法，解析选择条件。
|
|
|
*
|
|
|
* @param selection 选择条件
|
|
|
* @return 返回解析后的选择条件
|
|
|
*/
|
|
|
private String parseSelection(String selection) {
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 更新笔记的版本号。
|
|
|
*
|
|
|
* @param id 笔记ID
|
|
|
* @param selection 选择条件
|
|
|
* @param selectionArgs 选择条件参数
|
|
|
*/
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
sql.append("UPDATE ");
|
|
|
sql.append(TABLE.NOTE);
|
|
|
sql.append(" SET ");
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
sql.append(" WHERE ");
|
|
|
}
|
|
|
if (id > 0) {
|
|
|
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
|
|
|
}
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
for (String args : selectionArgs) {
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
}
|
|
|
sql.append(selectString);
|
|
|
}
|
|
|
|
|
|
// 执行SQL更新版本
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
}
|
|
|
|
|
|
@Override
|
|
|
public String getType(Uri uri) {
|
|
|
// TODO Auto-generated method stub
|
|
|
return null;
|
|
|
}
|
|
|
}
|
