|
|
/*
|
|
|
* 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;
|
|
|
|
|
|
/**
|
|
|
* 便签应用的内容提供者（ContentProvider）
|
|
|
* 负责管理便签数据的CRUD操作，包括搜索功能
|
|
|
*/
|
|
|
public class NotesProvider extends ContentProvider {
|
|
|
/**
|
|
|
* URI匹配器，用于匹配不同的URI请求，根据URI类型执行相应的操作
|
|
|
*/
|
|
|
private static final UriMatcher mMatcher;
|
|
|
|
|
|
/**
|
|
|
* 数据库帮助类实例，用于获取数据库连接
|
|
|
*/
|
|
|
private NotesDatabaseHelper mHelper;
|
|
|
|
|
|
/**
|
|
|
* 日志标签，用于日志输出
|
|
|
*/
|
|
|
private static final String TAG = "NotesProvider";
|
|
|
|
|
|
/**
|
|
|
* URI匹配类型常量定义，用于区分不同的URI请求类型
|
|
|
*/
|
|
|
private static final int URI_NOTE = 1; // 操作便签表（所有记录）
|
|
|
private static final int URI_NOTE_ITEM = 2; // 操作便签表（单条记录）
|
|
|
private static final int URI_DATA = 3; // 操作数据表（所有记录）
|
|
|
private static final int URI_DATA_ITEM = 4; // 操作数据表（单条记录）
|
|
|
private static final int URI_SEARCH = 5; // 搜索操作
|
|
|
private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议操作
|
|
|
|
|
|
/**
|
|
|
* 静态初始化块，配置URI匹配规则
|
|
|
* 为不同类型的URI请求配置对应的匹配类型
|
|
|
*/
|
|
|
static {
|
|
|
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
|
|
|
// 匹配便签表的URI
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
|
|
|
// 匹配数据表的URI
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
|
|
|
// 匹配搜索相关的URI
|
|
|
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
|
|
|
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
|
|
|
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 搜索查询的投影（列）定义
|
|
|
* x'0A' 在SQLite中代表 '\n' 字符
|
|
|
* 对于搜索结果中的标题和内容，我们将修剪 '\n' 和空白字符以显示更多信息
|
|
|
*/
|
|
|
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;
|
|
|
|
|
|
/**
|
|
|
* 便签片段搜索查询的SQL语句
|
|
|
* 搜索条件：便签片段包含关键词，且不在回收站中，类型为普通便签
|
|
|
*/
|
|
|
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;
|
|
|
|
|
|
/**
|
|
|
* 初始化内容提供者
|
|
|
* @return 如果初始化成功返回true，否则返回false
|
|
|
*/
|
|
|
@Override
|
|
|
public boolean onCreate() {
|
|
|
mHelper = NotesDatabaseHelper.getInstance(getContext());
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 查询数据
|
|
|
* @param uri 要查询的URI
|
|
|
* @param projection 要返回的列，null表示所有列
|
|
|
* @param selection 查询条件，null表示无条件
|
|
|
* @param selectionArgs 查询条件参数
|
|
|
* @param sortOrder 排序方式，null表示默认排序
|
|
|
* @return 包含查询结果的Cursor对象
|
|
|
*/
|
|
|
@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类型执行不同的查询操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE:
|
|
|
// 查询所有便签
|
|
|
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
|
|
|
sortOrder);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM:
|
|
|
// 查询单条便签记录
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
|
|
|
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_DATA:
|
|
|
// 查询所有数据记录
|
|
|
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
|
|
|
sortOrder);
|
|
|
break;
|
|
|
case URI_DATA_ITEM:
|
|
|
// 查询单条数据记录
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
|
|
|
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
|
|
|
break;
|
|
|
case URI_SEARCH:
|
|
|
case URI_SEARCH_SUGGEST:
|
|
|
// 处理搜索和搜索建议请求
|
|
|
if (sortOrder != null || projection != null) {
|
|
|
throw new IllegalArgumentException(
|
|
|
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
|
|
|
}
|
|
|
|
|
|
String searchString = null;
|
|
|
// 根据URI类型获取搜索关键词
|
|
|
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
|
|
|
if (uri.getPathSegments().size() > 1) {
|
|
|
searchString = uri.getPathSegments().get(1);
|
|
|
}
|
|
|
} else {
|
|
|
searchString = uri.getQueryParameter("pattern");
|
|
|
}
|
|
|
|
|
|
// 如果搜索关键词为空，返回null
|
|
|
if (TextUtils.isEmpty(searchString)) {
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
try {
|
|
|
// 构造模糊查询字符串
|
|
|
searchString = String.format("%%%s%%", searchString);
|
|
|
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);
|
|
|
}
|
|
|
|
|
|
// 设置内容观察者，以便在数据变化时通知相关组件
|
|
|
if (c != null) {
|
|
|
c.setNotificationUri(getContext().getContentResolver(), uri);
|
|
|
}
|
|
|
return c;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 插入数据
|
|
|
* @param uri 要插入数据的URI
|
|
|
* @param values 要插入的数据值
|
|
|
* @return 新插入数据的URI
|
|
|
*/
|
|
|
@Override
|
|
|
public Uri insert(Uri uri, ContentValues values) {
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
long dataId = 0, noteId = 0, insertedId = 0;
|
|
|
|
|
|
// 根据URI类型执行不同的插入操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE:
|
|
|
// 插入便签数据
|
|
|
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
|
|
|
break;
|
|
|
case URI_DATA:
|
|
|
// 插入数据表记录
|
|
|
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);
|
|
|
}
|
|
|
|
|
|
// 通知便签URI的数据变化
|
|
|
if (noteId > 0) {
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
|
|
|
}
|
|
|
|
|
|
// 通知数据URI的数据变化
|
|
|
if (dataId > 0) {
|
|
|
getContext().getContentResolver().notifyChange(
|
|
|
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
|
|
|
}
|
|
|
|
|
|
// 返回新插入数据的URI
|
|
|
return ContentUris.withAppendedId(uri, insertedId);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 删除数据
|
|
|
* @param uri 要删除数据的URI
|
|
|
* @param selection 删除条件，null表示无条件
|
|
|
* @param selectionArgs 删除条件参数
|
|
|
* @return 被删除的行数
|
|
|
*/
|
|
|
@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类型执行不同的删除操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE:
|
|
|
// 删除便签记录（不删除ID小于0的系统文件夹）
|
|
|
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
|
|
|
count = db.delete(TABLE.NOTE, selection, selectionArgs);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM:
|
|
|
// 删除单条便签记录
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
/**
|
|
|
* ID小于0的是系统文件夹，不允许删除（移动到回收站）
|
|
|
*/
|
|
|
long noteId = Long.valueOf(id);
|
|
|
if (noteId <= 0) {
|
|
|
break;
|
|
|
}
|
|
|
count = db.delete(TABLE.NOTE,
|
|
|
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
break;
|
|
|
case URI_DATA:
|
|
|
// 删除数据记录
|
|
|
count = db.delete(TABLE.DATA, selection, selectionArgs);
|
|
|
deleteData = true;
|
|
|
break;
|
|
|
case URI_DATA_ITEM:
|
|
|
// 删除单条数据记录
|
|
|
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);
|
|
|
}
|
|
|
|
|
|
// 如果成功删除数据，发送数据变化通知
|
|
|
if (count > 0) {
|
|
|
if (deleteData) {
|
|
|
// 如果删除的是数据表记录，通知便签URI数据变化
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
}
|
|
|
// 通知当前URI数据变化
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
}
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 更新数据
|
|
|
* @param uri 要更新数据的URI
|
|
|
* @param values 更新的数据值
|
|
|
* @param selection 更新条件，null表示无条件
|
|
|
* @param selectionArgs 更新条件参数
|
|
|
* @return 被更新的行数
|
|
|
*/
|
|
|
@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类型执行不同的更新操作
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
case URI_NOTE:
|
|
|
// 更新便签记录，增加版本号
|
|
|
increaseNoteVersion(-1, selection, selectionArgs);
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
|
|
|
break;
|
|
|
case URI_NOTE_ITEM:
|
|
|
// 更新单条便签记录，增加版本号
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
break;
|
|
|
case URI_DATA:
|
|
|
// 更新数据记录
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);
|
|
|
updateData = true;
|
|
|
break;
|
|
|
case URI_DATA_ITEM:
|
|
|
// 更新单条数据记录
|
|
|
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);
|
|
|
}
|
|
|
|
|
|
// 如果成功更新数据，发送数据变化通知
|
|
|
if (count > 0) {
|
|
|
if (updateData) {
|
|
|
// 如果更新的是数据表记录，通知便签URI数据变化
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
}
|
|
|
// 通知当前URI数据变化
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
}
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 解析查询/更新条件
|
|
|
* 将原始条件转换为SQL语句中的AND条件
|
|
|
* @param selection 原始条件字符串
|
|
|
* @return 格式化后的条件字符串
|
|
|
*/
|
|
|
private String parseSelection(String selection) {
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 增加便签版本号
|
|
|
* 当便签被修改时，调用此方法增加版本号
|
|
|
* @param id 便签ID，如果id>0则更新指定便签，否则更新所有匹配条件的便签
|
|
|
* @param selection 更新条件
|
|
|
* @param selectionArgs 更新条件参数
|
|
|
*/
|
|
|
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 ");
|
|
|
|
|
|
// 构造WHERE子句
|
|
|
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;
|
|
|
// 替换预编译语句中的占位符
|
|
|
for (String args : selectionArgs) {
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
}
|
|
|
sql.append(selectString);
|
|
|
}
|
|
|
|
|
|
// 执行SQL语句更新版本号
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 返回指定URI的MIME类型
|
|
|
* @param uri 要获取MIME类型的URI
|
|
|
* @return MIME类型字符串
|
|
|
*/
|
|
|
@Override
|
|
|
public String getType(Uri uri) {
|
|
|
// TODO: 实现此方法，返回合适的MIME类型
|
|
|
return null;
|
|
|
}
|
|
|
} |
