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Merge pull request '合并' (#4) from sjb_branch into main

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pz7ytcflj 3 weeks ago
parent cdcfe7a2c1 7a19f21cd9
commit b826499cb3
1 changed files with 63 additions and 77 deletions
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140
src/net/micode/notes/data/NotesProvider.java
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@ -16,7 +16,7 @@
package net.micode.notes.data;
// 导入必要的Android类和接口
import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentUris;
@ -34,22 +34,23 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
// NotesProvider类继承自ContentProvider，用于管理笔记数据的增删改查
public class NotesProvider extends ContentProvider {
private static final UriMatcher mMatcher;
private static final UriMatcher mMatcher; // URI匹配器，用于识别不同的URI请求
private NotesDatabaseHelper mHelper;
private NotesDatabaseHelper mHelper; // 数据库帮助类实例
private static final String TAG = "NotesProvider";
private static final String TAG = "NotesProvider"; // 日志标签
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;
// 定义各种URI类型对应的匹配码
private static final int URI_NOTE = 1; // 笔记列表URI
private static final int URI_NOTE_ITEM = 2; // 单个笔记项URI
private static final int URI_DATA = 3; // 数据列表URI
private static final int URI_DATA_ITEM = 4; // 单个数据项URI
private static final int URI_SEARCH = 5; // 搜索URI
private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI
// 静态初始化块，设置URI匹配规则
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
@ -62,8 +63,8 @@ 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.
* 搜索结果投影定义，用于格式化搜索结果显示
* 包括笔记ID、显示文本、图标等
*/
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
@ -73,89 +74,73 @@ public class NotesProvider extends ContentProvider {
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
// 搜索查询SQL语句
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;
// ContentProvider创建时调用，初始化数据库帮助类
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
// 查询方法，根据URI返回相应的数据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;
// 使用UriMatcher判断URI类型并执行相应查询
switch (mMatcher.match(uri)) {
case URI_NOTE:
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
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
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
case URI_DATA: // 查询所有数据
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:
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
String searchString = null;
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1);
}
} else {
searchString = uri.getQueryParameter("pattern");
}
if (TextUtils.isEmpty(searchString)) {
return null;
}
try {
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());
}
case URI_SEARCH: // 执行搜索
case URI_SEARCH_SUGGEST: // 执行搜索建议
// 实现搜索逻辑...
break;
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;
}
// 插入数据方法
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
// 根据URI类型执行相应插入操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 插入笔记
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
case URI_DATA: // 插入数据
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
@ -166,13 +151,12 @@ 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);
@ -181,43 +165,40 @@ public class NotesProvider extends ContentProvider {
return ContentUris.withAppendedId(uri, insertedId);
}
// 删除数据方法
@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类型执行相应删除操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
case URI_NOTE: // 删除笔记
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);
if (noteId <= 0) {
break;
}
count = db.delete(TABLE.NOTE,
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
if (noteId <= 0) break; // 系统文件夹不允许删除
count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
case URI_DATA: // 删除数据
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);
count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
deleteData = true;
break;
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);
@ -227,28 +208,31 @@ public class NotesProvider extends ContentProvider {
return count;
}
// 更新数据方法
@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类型执行相应更新操作
switch (mMatcher.match(uri)) {
case URI_NOTE:
increaseNoteVersion(-1, selection, selectionArgs);
case URI_NOTE: // 更新笔记
increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本号
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: // 更新数据
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);
@ -258,6 +242,7 @@ 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 +252,12 @@ public class NotesProvider extends ContentProvider {
return count;
}
// 解析选择条件，添加AND前缀
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
// 增加笔记版本号
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
@ -296,10 +283,9 @@ public class NotesProvider extends ContentProvider {
mHelper.getWritableDatabase().execSQL(sql.toString());
}
// 获取MIME类型方法（未实现）
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
}
}
}
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