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维护noteprovider

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laimaxgg 4 months ago
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commit 25fe9a4dca
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src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesProvider.java
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/*
* 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.
* 这个类为笔记应用提供了一个内容提供者，用于管理数据。
* 它通过 CRUD 操作与底层的 SQLite 数据库进行交互。
*/
package net.micode.notes.data;
package net.micode.notes.data; // 包名，表示该类属于数据层
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 android.app.SearchManager; // 导入搜索管理器类
import android.content.ContentProvider; // 导入内容提供者类
import android.content.ContentUris; // 导入内容URI处理类
import android.content.ContentValues; // 导入内容值类
import android.content.Intent; // 导入意图类
import android.content.UriMatcher; // 导入URI匹配器类
import android.database.Cursor; // 导入游标类
import android.database.sqlite.SQLiteDatabase; // 导入SQLite数据库类
import android.net.Uri; // 导入URI类
import android.text.TextUtils; // 导入文本工具类
import android.util.Log; // 导入日志工具类
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;
import net.micode.notes.R; // 导入资源类
import net.micode.notes.data.Notes.DataColumns; // 导入数据列类
import net.micode.notes.data.Notes.NoteColumns; // 导入笔记列类
import net.micode.notes.data.NotesDatabaseHelper.TABLE; // 导入数据库表类
public class NotesProvider extends ContentProvider {
// 定义用于 URI 匹配的常量
private static final UriMatcher mMatcher;
public class NotesProvider extends ContentProvider { // 笔记内容提供者类
private static final UriMatcher mMatcher; // URI匹配器实例
// 数据库帮助类实例
private NotesDatabaseHelper mHelper;
private NotesDatabaseHelper mHelper; // 数据库助手实例
// 日志标签
private static final String TAG = "NotesProvider";
private static final String TAG = "NotesProvider"; // 日志标签
private static final int URI_NOTE = 1; // 笔记URI常量
private static final int URI_NOTE_ITEM = 2; // 笔记项URI常量
private static final int URI_DATA = 3; // 数据URI常量
private static final int URI_DATA_ITEM = 4; // 数据项URI常量
private static final int URI_SEARCH = 5; // 搜索URI常量
private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI常量
// URI 代码
private static final int URI_NOTE = 1;
private static final int URI_NOTE_ITEM = 2;
private static final int URI_DATA = 3;
private static final int URI_DATA_ITEM = 4;
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
// 初始化 UriMatcher
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH); // 初始化URI匹配器
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 添加笔记URI
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 添加笔记项URI
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 添加数据URI
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 添加数据项URI
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 添加搜索URI
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 添加搜索建议URI
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 添加搜索建议URI
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
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);
}
/**
* x'0A' 表示 sqlite 中的 '\n' 字符。为了在搜索结果中显示更多信息，
* 我们将修剪 '\n' 和空格。
*/
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," // 笔记ID
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 笔记ID作为额外数据
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 修剪后的摘要作为文本1
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 修剪后的摘要作为文本2
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 搜索结果图标
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 意图动作为查看
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 意图数据类型
// 用于搜索建议的投影
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;
private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION // 笔记摘要搜索查询
+ " FROM " + TABLE.NOTE // 从笔记表中选择
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 摘要匹配条件
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除垃圾箱
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 笔记类型条件
// 用于搜索笔记的 SQL 查询
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;
// onCreate 方法
@Override
public boolean onCreate() { // 创建内容提供者
mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库助手实例
return true; // 返回成功
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
// 查询方法
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, // 查询方法
String sortOrder) {
Cursor c = null; // 游标初始化
SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库
String id = null; // ID初始化
switch (mMatcher.match(uri)) { // 根据URI匹配
case URI_NOTE: // 笔记查询
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, // 查询笔记表
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
switch (mMatcher.match(uri)) {
// 处理笔记的查询
case URI_NOTE:
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_NOTE_ITEM: // 笔记项查询
id = uri.getPathSegments().get(1); // 获取笔记ID
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id // 查询特定笔记
// 处理特定笔记的查询
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA: // 数据查询
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, // 查询数据表
// 处理数据的查询
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM: // 数据项查询
id = uri.getPathSegments().get(1); // 获取数据ID
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id // 查询特定数据
// 处理特定数据项的查询
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_SEARCH: // 搜索查询
case URI_SEARCH_SUGGEST: // 搜索建议查询
if (sortOrder != null || projection != null) { // 不允许指定排序或投影
// 处理搜索查询
case URI_SEARCH:
case URI_SEARCH_SUGGEST:
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
String searchString = null; // 搜索字符串初始化
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { // 如果是搜索建议
// 提取搜索查询字符串
String searchString = null;
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1); // 获取搜索字符串
searchString = uri.getPathSegments().get(1);
}
} else {
searchString = uri.getQueryParameter("pattern"); // 从查询参数获取搜索字符串
searchString = uri.getQueryParameter("pattern");
}
if (TextUtils.isEmpty(searchString)) { // 如果搜索字符串为空
return null; // 返回空
if (TextUtils.isEmpty(searchString)) {
return null;
}
// 执行搜索查询
try {
searchString = String.format("%%%s%%", searchString); // 格式化搜索字符串
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, // 执行搜索查询
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
} catch (IllegalStateException ex) { // 捕获异常
Log.e(TAG, "got exception: " + ex.toString()); // 记录错误日志
} catch (IllegalStateException ex) {
Log.e(TAG, "got exception: " + ex.toString());
}
break;
default: // 未知URI处理
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (c != null) { // 如果游标不为空
c.setNotificationUri(getContext().getContentResolver(), uri); // 设置通知URI
if (c != null) {
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c; // 返回游标
return c;
}
// 插入方法
@Override
public Uri insert(Uri uri, ContentValues values) { // 插入方法
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
long dataId = 0, noteId = 0, insertedId = 0; // ID初始化
switch (mMatcher.match(uri)) { // 根据URI匹配
case URI_NOTE: // 插入笔记
insertedId = noteId = db.insert(TABLE.NOTE, null, values); // 插入笔记表
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
switch (mMatcher.match(uri)) {
// 处理笔记的插入
case URI_NOTE:
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA: // 插入数据
if (values.containsKey(DataColumns.NOTE_ID)) { // 如果包含笔记ID
noteId = values.getAsLong(DataColumns.NOTE_ID); // 获取笔记ID
// 处理数据的插入
case URI_DATA:
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
Log.d(TAG, "Wrong data format without note id:" + values.toString()); // 记录错误日志
Log.d(TAG, "Wrong data format without note id:" + values.toString());
}
insertedId = dataId = db.insert(TABLE.DATA, null, values); // 插入数据表
insertedId = dataId = db.insert(TABLE.DATA, null, values);
break;
default: // 未知URI处理
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 通知笔记URI
//
// 通知内容解析器有变化
if (noteId > 0) {
getContext().getContentResolver().notifyChange( // 通知内容解析器
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// 通知数据URI
// 通知数据 URI 有变化
if (dataId > 0) {
getContext().getContentResolver().notifyChange( // 通知内容解析器
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
}
return ContentUris.withAppendedId(uri, insertedId); // 返回插入的URI
return ContentUris.withAppendedId(uri, insertedId);
}
// 删除方法
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) { // 删除方法
int count = 0; // 删除计数
String id = null; // ID初始化
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean deleteData = false; // 数据删除标志
switch (mMatcher.match(uri)) { // 根据URI匹配
case URI_NOTE: // 删除笔记
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 添加条件
count = db.delete(TABLE.NOTE, selection, selectionArgs); // 删除笔记表
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean deleteData = false;
switch (mMatcher.match(uri)) {
// 处理笔记的删除
case URI_NOTE:
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM: // 删除笔记项
id = uri.getPathSegments().get(1); // 获取笔记ID
// 处理特定笔记的删除
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
/**
* ID 小于 0 的是系统文件夹，不允许删除
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
long noteId = Long.valueOf(id); // 转换ID
if (noteId <= 0) { // 如果ID小于等于0
break; // 退出
long noteId = Long.valueOf(id);
if (noteId <= 0) {
break;
}
count = db.delete(TABLE.NOTE, // 删除特定笔记
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); // 删除数据表
deleteData = true; // 设置数据删除标志
// 处理数据的删除
case URI_DATA:
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM: // 删除数据项
id = uri.getPathSegments().get(1); // 获取数据ID
count = db.delete(TABLE.DATA, // 删除特定数据
// 处理特定数据项的删除
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
deleteData = true; // 设置数据删除标志
deleteData = true;
break;
default: // 未知URI处理
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) { // 如果删除成功
if (deleteData) { // 如果删除的是数据
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI
if (count > 0) {
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI
getContext().getContentResolver().notifyChange(uri, null);
}
return count; // 返回删除计数
return count;
}
// 更新方法
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { // 更新方法
int count = 0; // 更新计数
String id = null; // ID初始化
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean updateData = false; // 数据更新标志
switch (mMatcher.match(uri)) { // 根据URI匹配
case URI_NOTE: // 更新笔记
increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本
count = db.update(TABLE.NOTE, values, selection, selectionArgs); // 更新笔记表
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean updateData = false;
switch (mMatcher.match(uri)) {
// 处理笔记的更新
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM: // 更新笔记项
id = uri.getPathSegments().get(1); // 获取笔记ID
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加笔记版本
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id // 更新特定笔记
// 处理特定笔记的更新
case URI_NOTE_ITEM:
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
count = db.update(TABLE.DATA, values, selection, selectionArgs); // 更新数据表
updateData = true; // 设置数据更新标志
// 处理数据的更新
case URI_DATA:
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM: // 更新数据项
id = uri.getPathSegments().get(1); // 获取数据ID
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id // 更新特定数据
// 处理特定数据项的更新
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
updateData = true; // 设置数据更新标志
updateData = true;
break;
default: // 未知URI处理
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
if (count > 0) { // 如果更新成功
if (updateData) { // 如果更新的是数据
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记URI
if (count > 0) {
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI
getContext().getContentResolver().notifyChange(uri, null);
}
return count; // 返回更新计数
return count;
}
private String parseSelection(String selection) { // 解析选择条件
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); // 返回条件
// 解析选择方法
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { // 增加笔记版本
StringBuilder sql = new StringBuilder(120); // SQL语句构建器
sql.append("UPDATE "); // 更新语句
sql.append(TABLE.NOTE); // 更新笔记表
sql.append(" SET "); // 设置字段
sql.append(NoteColumns.VERSION); // 笔记版本字段
sql.append("=" + NoteColumns.VERSION + "+1 "); // 增加版本
// 增加笔记版本方法
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)) { // 如果有ID或选择条件
sql.append(" WHERE "); // 添加WHERE条件
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");
}
if (id > 0) { // 如果有ID
sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 添加ID条件
if (id > 0) {
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
}
if (!TextUtils.isEmpty(selection)) { // 如果有选择条件
String selectString = id > 0 ? parseSelection(selection) : selection; // 解析选择条件
for (String args : selectionArgs) { // 替换参数
if (!TextUtils.isEmpty(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
selectString = selectString.replaceFirst("\\?", args);
}
sql.append(selectString); // 添加选择条件
sql.append(selectString);
}
mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL语句
mHelper.getWritableDatabase().execSQL(sql.toString());
}
// 获取类型方法
@Override
public String getType(Uri uri) { // 获取类型方法
// TODO Auto-generated method stub
return null; // 返回空
public String getType(Uri uri) {
// 暂不实现
return null;
}
}
}

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