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LuLanjian0916 11 months ago
parent ff8ca8cf71
commit 8453880029
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MiNotes-master/app/src/main/java/net/micode/notes/data/NotesProvider.java
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@ -14,6 +14,8 @@
* limitations under the License.
*/
package net.micode.notes.data;
@ -35,89 +37,114 @@ import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/**
* 笔记内容提供器（实现Android ContentProvider接口）
* 负责处理数据的增删改查操作，并支持搜索建议功能
*/
public class NotesProvider extends ContentProvider {
// URI匹配器（用于解析不同的URI请求）
private static final UriMatcher mMatcher;
// 数据库帮助类实例（用于操作数据库）
private NotesDatabaseHelper mHelper;
// 日志标签
private static final String TAG = "NotesProvider";
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;
// URI匹配器常量（对应不同的操作类型）
private static final int URI_NOTE = 1; // 笔记列表URI
private static final int URI_NOTE_ITEM = 2; // 单个笔记URI
private static final int URI_DATA = 3; // 数据项列表URI（如附件）
private static final int URI_DATA_ITEM = 4; // 单个数据项URI
private static final int URI_SEARCH = 5; // 搜索请求URI
private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI
// 静态代码块：初始化URI匹配器
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// 匹配笔记列表URI：content://micode_notes/note
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
// 匹配单个笔记URI：content://micode_notes/note/123
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
// 匹配数据项列表URI：content://micode_notes/data
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
// 匹配单个数据项URI：content://micode_notes/data/456
mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
// 匹配搜索URI：content://micode_notes/search
mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
// 匹配搜索建议URI（带查询词）：content://micode_notes/suggest_query/xxx
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' 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.
* 搜索投影定义（用于构建搜索结果的字段）
* - 替换换行符x'0A'为空格，并修剪空白字符
* - 关联SearchManager所需的字段（如搜索建议文本、图标、意图等）
*/
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;
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 传递笔记ID到意图
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 搜索建议第一行文本
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 搜索建议第二行文本
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 搜索结果图标资源ID
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 点击后的动作（查看笔记）
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 意图数据类型
// 搜索查询语句（查询包含关键词的笔记内容，排除回收站和非笔记类型）
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 ?" // 模糊匹配搜索词
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站中的笔记
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 仅查询普通笔记类型
// ContentProvider初始化方法（创建数据库帮助类实例）
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库帮助类单例
return true;
}
// 查询数据方法（处理不同URI的查询请求）
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库
String id = null; // 用于存储URI中的ID部分
switch (mMatcher.match(uri)) {
case URI_NOTE:
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
// 查询笔记列表
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
break;
case URI_NOTE_ITEM:
// 查询单个笔记（从URI路径中提取ID）
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
c = db.query(TABLE.NOTE, projection,
NoteColumns.ID + "=" + id + parseSelection(selection), // 添加ID条件和附加查询条件
selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
// 查询数据项列表（如附件）
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
break;
case URI_DATA_ITEM:
// 查询单个数据项（从URI路径中提取ID）
id = uri.getPathSegments().get(1);
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
c = db.query(TABLE.DATA, projection,
DataColumns.ID + "=" + id + parseSelection(selection), // 添加ID条件和附加查询条件
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");
"搜索查询不支持排序或投影参数");
}
String searchString = null;
// 从URI中提取搜索词（根据不同的URI类型）
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1);
@ -127,179 +154,186 @@ public class NotesProvider extends ContentProvider {
}
if (TextUtils.isEmpty(searchString)) {
return null;
return null; // 空搜索词返回空结果
}
try {
// 构造模糊查询参数（前后添加通配符）
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
// 执行原生SQL查询（使用预定义的搜索语句）
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
} catch (IllegalStateException ex) {
Log.e(TAG, "got exception: " + ex.toString());
Log.e(TAG, "搜索查询异常: " + ex.toString());
}
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
throw new IllegalArgumentException("未知URI: " + uri);
}
if (c != null) {
// 设置内容变更通知（当数据变化时通知观察者）
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;
}
// 插入数据方法（处理不同URI的插入请求）
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
long dataId = 0, noteId = 0, insertedId = 0; // 插入记录的ID
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 插入新笔记
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
// 插入新数据项（需关联笔记ID）
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
noteId = values.getAsLong(DataColumns.NOTE_ID); // 从参数中获取所属笔记ID
} else {
Log.d(TAG, "Wrong data format without note id:" + values.toString());
Log.d(TAG, "错误：数据项未包含笔记ID: " + values.toString());
}
insertedId = dataId = db.insert(TABLE.DATA, null, values);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
throw new IllegalArgumentException("未知URI: " + uri);
}
// Notify the note uri
// 通知内容变更（根据插入的是笔记还是数据项）
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); // 通知笔记URI变更
}
// Notify the data uri
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); // 通知数据项URI变更
}
return ContentUris.withAppendedId(uri, insertedId);
return ContentUris.withAppendedId(uri, insertedId); // 返回插入记录的URI
}
// 删除数据方法（处理不同URI的删除请求）
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean deleteData = false;
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean deleteData = false; // 是否删除的是数据项（用于通知逻辑）
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 删除笔记列表（添加条件：ID>0，排除系统文件夹）
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
// 删除单个笔记（从URI中提取ID，排除系统文件夹）
id = uri.getPathSegments().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
long noteId = Long.valueOf(id);
if (noteId <= 0) {
if (noteId <= 0) { // 系统文件夹ID为负数或0，不允许删除
break;
}
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
// 删除数据项（标记为删除数据项类型）
count = db.delete(TABLE.DATA,
(uri.getPathSegments().size() > 1 ? DataColumns.ID + "=" + uri.getPathSegments().get(1) : selection)
+ parseSelection(selection), selectionArgs);
deleteData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
throw new IllegalArgumentException("未知URI: " + uri);
}
if (count > 0) {
// 通知内容变更（数据项删除时需通知笔记列表，因为可能影响笔记内容）
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI变更
}
return count;
}
// 更新数据方法（处理不同URI的更新请求）
@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;
SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
boolean updateData = false; // 是否更新的是数据项（用于通知逻辑）
switch (mMatcher.match(uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
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);
// 更新笔记时增加版本号（用于数据同步或乐观锁）
increaseNoteVersion(uri.getPathSegments().size() > 1 ?
Long.valueOf(uri.getPathSegments().get(1)) : -1, selection, selectionArgs);
// 执行更新操作
count = db.update(TABLE.NOTE, values,
(uri.getPathSegments().size() > 1 ? NoteColumns.ID + "=" + uri.getPathSegments().get(1) : selection)
+ parseSelection(selection), selectionArgs);
break;
case URI_DATA:
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
// 更新数据项（标记为更新数据项类型）
count = db.update(TABLE.DATA, values,
(uri.getPathSegments().size() > 1 ? DataColumns.ID + "=" + uri.getPathSegments().get(1) : selection)
+ parseSelection(selection), selectionArgs);
updateData = true;
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
throw new IllegalArgumentException("未知URI: " + uri);
}
if (count > 0) {
// 通知内容变更（数据项更新时需通知笔记列表，因为可能影响笔记内容）
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI变更
}
return count;
}
// 解析附加查询条件（在主条件后添加AND子句）
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
// 增加笔记版本号（用于数据变更跟踪，支持单条记录或批量更新）
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 ");
sql.append("UPDATE " + TABLE.NOTE + " SET " + NoteColumns.VERSION + "=" + NoteColumns.VERSION + "+1 ");
// 构建WHERE条件（支持按ID或自定义条件更新）
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);
if (id > 0) {
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
}
if (!TextUtils.isEmpty(selection)) {
// 替换占位符?为实际参数值（简化处理，仅适用于简单场景）
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
selectString = selectString.replaceFirst("\\?", args);
}
sql.append(selectString);
}
sql.append(selectString);
}
mHelper.getWritableDatabase().execSQL(sql.toString());
mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL语句
}
// 获取数据类型（未实现，可根据需求返回MIME类型）
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
// TODO: 根据URI返回对应的MIME类型（如vnd.android.cursor.dir/note）
return null;
}
}
}
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