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zgx
zgx 2 months ago
parent 738d89a51c
commit ce39d8c133
1 changed files with 104 additions and 58 deletions
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162
src/net/micode/notes/data/NotesProvider.java
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@ -34,22 +34,26 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/**
* 笔记内容提供者，提供标准ContentProvider接口管理笔记数据
* 功能包括：基础CRUD操作、搜索建议支持、数据变更通知
*/
public class NotesProvider extends ContentProvider {
// URI匹配器，用于路由不同数据请求
private static final UriMatcher mMatcher;
private NotesDatabaseHelper mHelper;
private static final String TAG = "NotesProvider";
private NotesDatabaseHelper mHelper;// 数据库帮助类实例
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 String TAG = "NotesProvider";// 日志标签
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
private static final int URI_NOTE = 1;// 笔记集合操作
private static final int URI_NOTE_ITEM = 2; // 单个笔记操作
private static final int URI_DATA = 3;// 数据项集合操作
private static final int URI_DATA_ITEM = 4;// 单个数据项操作
private static final int URI_SEARCH = 5; // 全文搜索
private static final int URI_SEARCH_SUGGEST = 6;// 搜索建议
// 初始化URI匹配规则
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
@ -57,30 +61,37 @@ public class NotesProvider extends ContentProvider {
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
// 系统搜索建议标准URI
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
}
/**
* 搜索建议投影映射：
* - 将数据库字段映射到系统搜索建议需要的字段
* - x'0A'代表SQLite中的换行符，去除换行和空格以优化显示
*/
/**
* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
* we will trim '\n' and white space in order to show more information.
*/
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 final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","// 原始ID
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","// 建议项携带数据
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","// 主文本
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 副文本
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","// 建议图标
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","// 点击动作
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 数据类型
// 笔记片段搜索SQL查询（排除回收站且类型为普通笔记）
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;
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"// 模糊查询
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER// 过滤回收站
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 仅普通笔记类型
@Override
public boolean onCreate() {
// 初始化数据库帮助类（单例模式）
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
@ -91,47 +102,53 @@ public class NotesProvider extends ContentProvider {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
// 根据URI类型路由处理
switch (mMatcher.match(uri)) {
case URI_NOTE:
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:
case URI_NOTE_ITEM:// 查询单个笔记
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id// 从URI路径获取ID
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
case URI_DATA:// 查询所有数据项
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM:
case URI_DATA_ITEM:// 查询单个数据项
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:
case URI_SEARCH:// 处理搜索请求
case URI_SEARCH_SUGGEST: // 处理搜索建议请求
// 验证参数完整性
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
// 解析搜索关键词
String searchString = null;
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
// 从建议URI路径获取：content://auth/search_suggest_query/关键词
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1);
}
} else {
// 从查询参数获取：content://auth/search?pattern=关键词
searchString = uri.getQueryParameter("pattern");
}
if (TextUtils.isEmpty(searchString)) {
return null;
return null; // 空搜索直接返回
}
try {
// 构造模糊查询参数（前后加%）
searchString = String.format("%%%s%%", searchString);
// 执行原始SQL查询（参数化防止注入）
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
} catch (IllegalStateException ex) {
@ -141,21 +158,27 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 设置数据变更通知URI（重要：使CursorLoader能自动刷新）
if (c != null) {
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;
}
/**
* 插入新数据项
* @param uri 目标URI（note或data表）
* @param values 要插入的数据值
* @return 新创建项的URI
*/
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 插入新笔记
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
case URI_DATA: // 插入笔记关联数据
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
@ -166,50 +189,55 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
if (noteId > 0) {
// Notify the note uri// 发送数据变更通知
if (noteId > 0) {// 通知笔记URI变更（触发CursorLoader刷新）
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
// Notify the data uri// 通知数据URI变更
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
}
// 返回新创建项的完整URI（如content://auth/note/123）
return ContentUris.withAppendedId(uri, insertedId);
}
/**
* 删除数据项
* @param uri 目标URI（可指定单个项或集合）
* @return 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;
boolean deleteData = false;// 标记是否删除的是data表数据
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE:// 删除多个笔记
// 防止删除系统文件夹（ID>0的条件）
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
case URI_NOTE_ITEM:// 删除单个笔记
id = uri.getPathSegments().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
long noteId = Long.valueOf(id);
long noteId = Long.valueOf(id); // 系统文件夹（ID<=0）不允许删除
if (noteId <= 0) {
break;
}
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
case URI_DATA:// 删除多个数据项
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
case URI_DATA_ITEM:// 删除单个数据项
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
@ -218,37 +246,44 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 发送通知（数据变更可能影响笔记显示）
if (count > 0) {
if (deleteData) {
// 数据变更需要通知笔记列表更新
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
} // 通知当前URI对应的数据变更
getContext().getContentResolver().notifyChange(uri, null);
}
return count;
}
/**
* 更新数据项
* @param uri 目标URI
* @param values 新数据值
* @return 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;
boolean updateData = false;// 标记是否更新data表
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 批量更新笔记
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
case URI_NOTE_ITEM: // 更新单个笔记
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:
case URI_DATA: // 更新多个数据项
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
case URI_DATA_ITEM:// 更新单个数据项
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
@ -257,20 +292,31 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 发送数据变更通知
if (count > 0) {
if (updateData) {
// 数据变更需要更新关联笔记
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
}
return count;
}
/**
* 合并基本选择条件
* @param selection 原始选择条件
* @return 格式化后的条件语句
*/
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
/**
* 增加笔记版本号（实现乐观锁机制）
* @param id 笔记ID（-1表示批量更新）
* @param selection 选择条件
* @param selectionArgs 条件参数
*/
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
@ -278,13 +324,13 @@ public class NotesProvider extends ContentProvider {
sql.append(" SET ");
sql.append(NoteColumns.VERSION);
sql.append("=" + NoteColumns.VERSION + "+1 ");
// 构造WHERE条件
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");
}
if (id > 0) {
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
}
} // 处理选择条件（手动替换参数防止注入）
if (!TextUtils.isEmpty(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
@ -292,13 +338,13 @@ public class NotesProvider extends ContentProvider {
}
sql.append(selectString);
}
// 执行原生SQL更新（绕过常规更新流程）
mHelper.getWritableDatabase().execSQL(sql.toString());
}
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub// 根据URI返回MIME类型（当前未实现）
return null;
}

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