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luchan 2 months ago
parent 7c4b800f5e
commit 5016300f96
1 changed files with 95 additions and 27 deletions
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122
src/Notes-master/app/src/main/java/net/micode/notes/data/NotesProvider.java
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@ -16,7 +16,6 @@
package net.micode.notes.data;
import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentUris;
@ -34,22 +33,25 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/**
* NotesProvider是一个内容提供者，用于管理小米便签应用的数据访问。
* 它通过统一的URI接口对外提供便签和文件夹的CRUD操作，并支持搜索功能。
*/
public class NotesProvider extends ContentProvider {
// URI匹配器，用于解析不同的URI请求类型
private static final UriMatcher mMatcher;
private NotesDatabaseHelper mHelper;
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匹配码常量
private static final int URI_NOTE = 1; // 匹配所有便签/文件夹
private static final int URI_NOTE_ITEM = 2; // 匹配单个便签/文件夹
private static final int URI_DATA = 3; // 匹配所有数据项
private static final int URI_DATA_ITEM = 4; // 匹配单个数据项
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
// 初始化URI匹配器
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
@ -62,8 +64,8 @@ public class NotesProvider extends ContentProvider {
}
/**
* 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.
* 便签搜索的投影列定义
* 用于将搜索结果转换为搜索框架所需的格式
*/
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
@ -73,28 +75,46 @@ public class NotesProvider extends ContentProvider {
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
/**
* 便签搜索的SQL查询语句
* 搜索便签内容并排除回收站中的便签
*/
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ContentProvider
* @return 初始化成功返回true
*/
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
/**
* 根据URI查询数据
* @param uri 查询的URI
* @param projection 需要返回的列
* @param selection 查询条件
* @param selectionArgs 查询条件参数
* @param sortOrder 排序方式
* @return 返回符合条件的Cursor
*/
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
// 根据不同的URI类型执行不同的查询操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
@ -102,8 +122,7 @@ public class NotesProvider extends ContentProvider {
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
@ -112,11 +131,13 @@ public class NotesProvider extends ContentProvider {
break;
case URI_SEARCH:
case URI_SEARCH_SUGGEST:
// 搜索功能不支持自定义排序和投影
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
// 提取搜索关键词
String searchString = null;
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
@ -126,14 +147,15 @@ public class NotesProvider extends ContentProvider {
searchString = uri.getQueryParameter("pattern");
}
// 关键词为空则返回空结果
if (TextUtils.isEmpty(searchString)) {
return null;
}
try {
// 执行模糊搜索
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
} catch (IllegalStateException ex) {
Log.e(TAG, "got exception: " + ex.toString());
}
@ -141,16 +163,26 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 设置通知URI，当数据变化时通知观察者
if (c != null) {
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;
}
/**
* 向指定URI插入数据
* @param uri 插入数据的目标URI
* @param values 要插入的数据
* @return 返回插入数据的URI
*/
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
// 根据不同的URI类型执行不同的插入操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
@ -166,13 +198,13 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
// 通知数据变化
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
@ -181,12 +213,21 @@ public class NotesProvider extends ContentProvider {
return ContentUris.withAppendedId(uri, insertedId);
}
/**
* 根据URI删除数据
* @param uri 删除数据的目标URI
* @param selection 删除条件
* @param selectionArgs 删除条件参数
* @return 返回删除的行数
*/
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
String id = null;
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean deleteData = false;
// 根据不同的URI类型执行不同的删除操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
@ -194,10 +235,7 @@ public class NotesProvider extends ContentProvider {
break;
case URI_NOTE_ITEM:
id = uri.getPathSegments().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
// 不允许删除系统文件夹
long noteId = Long.valueOf(id);
if (noteId <= 0) {
break;
@ -218,6 +256,8 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 通知数据变化
if (count > 0) {
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
@ -227,12 +267,22 @@ public class NotesProvider extends ContentProvider {
return count;
}
/**
* 根据URI更新数据
* @param uri 更新数据的目标URI
* @param values 要更新的数据
* @param selection 更新条件
* @param selectionArgs 更新条件参数
* @return 返回更新的行数
*/
@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;
// 根据不同的URI类型执行不同的更新操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
@ -258,6 +308,7 @@ public class NotesProvider extends ContentProvider {
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 通知数据变化
if (count > 0) {
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
@ -267,10 +318,21 @@ public class NotesProvider extends ContentProvider {
return count;
}
/**
* 解析查询条件，处理条件为空的情况
* @param selection 原始查询条件
* @return 处理后的查询条件
*/
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
/**
* 增加便签的版本号，用于数据同步
* @param id 便签ID，如果为-1则更新所有符合条件的便签
* @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 ");
@ -279,6 +341,7 @@ public class NotesProvider extends ContentProvider {
sql.append(NoteColumns.VERSION);
sql.append("=" + NoteColumns.VERSION + "+1 ");
// 构建WHERE子句
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");
}
@ -293,13 +356,18 @@ public class NotesProvider extends ContentProvider {
sql.append(selectString);
}
// 执行SQL语句
mHelper.getWritableDatabase().execSQL(sql.toString());
}
/**
* 获取URI对应的数据类型
* @param uri 目标URI
* @return 返回数据类型的MIME类型
*/
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}
}
}
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