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Update NotesProvider.java

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master
pasky49wx 1 month ago
parent d064374713
commit 7d13b2c3cb
1 changed files with 81 additions and 14 deletions
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95
源程序代码-小米便签-Notes-master/Notes-master/src/net/micode/notes/data/NotesProvider.java
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@ -34,7 +34,10 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
/**
* NotesProvider 是小米便签应用的内容提供者，负责管理便签数据的访问。
* 它实现了对便签和便签数据的CRUD操作，并支持搜索功能。
*/
public class NotesProvider extends ContentProvider {
private static final UriMatcher mMatcher;
@ -42,15 +45,16 @@ public class NotesProvider extends ContentProvider {
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_NOTE = 1; // 匹配所有便签
private static final int URI_NOTE_ITEM = 2; // 匹配单个便签
private static final int URI_DATA = 3; // 匹配所有便签数据
private static final int URI_DATA_ITEM = 4; // 匹配单个便签数据
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
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
static {
// 初始化URI匹配器，用于识别不同的URI请求
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
@ -72,19 +76,31 @@ public class NotesProvider extends ContentProvider {
+ 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;
// 便签搜索查询语句，用于搜索便签摘要中包含特定关键词的便签
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，创建数据库帮助类实例
* @return 初始化成功返回true，否则返回false
*/
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
}
/**
* 查询便签数据
* @param uri 查询的URI
* @param projection 返回的列
* @param selection 选择条件
* @param selectionArgs 选择条件参数
* @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) {
@ -93,25 +109,30 @@ public class NotesProvider extends ContentProvider {
String id = null;
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 查询所有便签
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_NOTE_ITEM:
// 查询单个便签
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
// 查询所有便签数据
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM:
// 查询单个便签数据
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:
// 处理搜索请求
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
@ -131,6 +152,7 @@ public class NotesProvider extends ContentProvider {
}
try {
// 执行搜索查询
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
@ -141,21 +163,29 @@ 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;
}
/**
* 插入新的便签或便签数据
* @param uri 插入的URI
* @param values 要插入的数据
* @return 返回插入后的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:
// 插入新便签
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
// 插入新便签数据
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
@ -181,6 +211,13 @@ public class NotesProvider extends ContentProvider {
return ContentUris.withAppendedId(uri, insertedId);
}
/**
* 删除便签或便签数据
* @param uri 删除的URI
* @param selection 选择条件
* @param selectionArgs 选择条件参数
* @return 返回删除的行数
*/
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int count = 0;
@ -189,10 +226,12 @@ public class NotesProvider extends ContentProvider {
boolean deleteData = false;
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 删除便签
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
// 删除单个便签
id = uri.getPathSegments().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
@ -206,10 +245,12 @@ public class NotesProvider extends ContentProvider {
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
// 删除便签数据
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
// 删除单个便签数据
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
@ -218,6 +259,7 @@ 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);
@ -226,7 +268,14 @@ public class NotesProvider extends ContentProvider {
}
return count;
}
/**
* 更新便签或便签数据
* @param uri 更新的URI
* @param values 要更新的数据
* @param selection 选择条件
* @param selectionArgs 选择条件参数
* @return 返回更新的行数
*/
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
int count = 0;
@ -235,20 +284,24 @@ public class NotesProvider extends ContentProvider {
boolean updateData = false;
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 更新便签
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
// 更新单个便签
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:
// 更新便签数据
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
// 更新单个便签数据
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
@ -257,7 +310,7 @@ public class NotesProvider extends ContentProvider {
default:
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);
@ -266,11 +319,20 @@ public class NotesProvider extends ContentProvider {
}
return count;
}
/**
* 解析选择条件，添加额外的条件
* @param selection 原始选择条件
* @return 解析后的选择条件
*/
private String parseSelection(String selection) {
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
/**
* 增加便签版本号，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 选择条件
* @param selectionArgs 选择条件参数
*/
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
@ -296,6 +358,11 @@ public class NotesProvider extends ContentProvider {
mHelper.getWritableDatabase().execSQL(sql.toString());
}
/**
* 获取URI对应的MIME类型
* @param uri 请求的URI
* @return 返回对应的MIME类型
*/
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub

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