diff --git a/tool/DataUtils.java b/tool/DataUtils.java index 2a14982..df7a068 100644 --- a/tool/DataUtils.java +++ b/tool/DataUtils.java @@ -1,43 +1,8 @@ -/* - * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - package net.micode.notes.tool; - -import android.content.ContentProviderOperation; -import android.content.ContentProviderResult; -import android.content.ContentResolver; -import android.content.ContentUris; -import android.content.ContentValues; -import android.content.OperationApplicationException; -import android.database.Cursor; -import android.os.RemoteException; -import android.util.Log; - -import net.micode.notes.data.Notes; -import net.micode.notes.data.Notes.CallNote; -import net.micode.notes.data.Notes.NoteColumns; -import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute; - -import java.util.ArrayList; -import java.util.HashSet; - - + public class DataUtils { public static final String TAG = "DataUtils"; - public static boolean batchDeleteNotes(ContentResolver resolver, HashSet ids) { + public static boolean batchDeleteNotes(ContentResolver resolver, HashSet ids) { //直接删除多个笔记 if (ids == null) { Log.d(TAG, "the ids is null"); return true; @@ -46,19 +11,20 @@ public class DataUtils { Log.d(TAG, "no id is in the hashset"); return true; } - - ArrayList operationList = new ArrayList(); + + ArrayList operationList = new ArrayList(); //提供一个任务列表 for (long id : ids) { if(id == Notes.ID_ROOT_FOLDER) { Log.e(TAG, "Don't delete system folder root"); continue; - } + } //如果发现是根文件夹，则不删除 ContentProviderOperation.Builder builder = ContentProviderOperation - .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); - operationList.add(builder.build()); + .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //用newDelete实现删除功能 + operationList.add(builder.build()); // } try { - ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); + ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//主机名（或叫Authority）用于唯一标识这个ContentProvider，外部调用者可以根据这个标识来找到它。 + //数据库事务，数据库事务是由一组数据库操作序列组成，事务作为一个整体被执行 if (results == null || results.length == 0 || results[0] == null) { Log.d(TAG, "delete notes failed, ids:" + ids.toString()); return false; @@ -71,33 +37,33 @@ public class DataUtils { } return false; } - + public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) { ContentValues values = new ContentValues(); values.put(NoteColumns.PARENT_ID, desFolderId); values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId); values.put(NoteColumns.LOCAL_MODIFIED, 1); - resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); + resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); //对需要移动的便签进行数据更新，然后用update实现 } - + public static boolean batchMoveToFolder(ContentResolver resolver, HashSet ids, long folderId) { if (ids == null) { Log.d(TAG, "the ids is null"); return true; } - + ArrayList operationList = new ArrayList(); for (long id : ids) { ContentProviderOperation.Builder builder = ContentProviderOperation - .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); + .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //通过withAppendedId方法，为该Uri加上ID builder.withValue(NoteColumns.PARENT_ID, folderId); builder.withValue(NoteColumns.LOCAL_MODIFIED, 1); operationList.add(builder.build()); - } - + }//将ids里包含的每一列的数据逐次加入到operationList中，等待最后的批量处理 + try { - ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); + ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); //applyBatch一次性处理一个操作列表 if (results == null || results.length == 0 || results[0] == null) { Log.d(TAG, "delete notes failed, ids:" + ids.toString()); return false; @@ -110,7 +76,7 @@ public class DataUtils { } return false; } - + /** * Get the all folder count except system folders {@link Notes#TYPE_SYSTEM}} */ @@ -119,13 +85,13 @@ public class DataUtils { new String[] { "COUNT(*)" }, NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?", new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)}, - null); - + null); //筛选条件：源文件不为trash folder + int count = 0; if(cursor != null) { if(cursor.moveToFirst()) { try { - count = cursor.getInt(0); + count = cursor.getInt(0); } catch (IndexOutOfBoundsException e) { Log.e(TAG, "get folder count failed:" + e.toString()); } finally { @@ -134,29 +100,29 @@ public class DataUtils { } } return count; - } - + } + public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) { - Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), + Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), //通过withAppendedId方法，为该Uri加上ID null, NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER, - new String [] {String.valueOf(type)}, - null); - + new String [] {String.valueOf(type)}, + null); //查询条件：type符合，且不属于垃圾文件夹 + boolean exist = false; if (cursor != null) { - if (cursor.getCount() > 0) { + if (cursor.getCount() > 0) {//用getcount函数判断cursor是否为空 exist = true; } cursor.close(); } return exist; } - + public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null, null, null, null); - + boolean exist = false; if (cursor != null) { if (cursor.getCount() > 0) { @@ -166,11 +132,11 @@ public class DataUtils { } return exist; } - + public static boolean existInDataDatabase(ContentResolver resolver, long dataId) { Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null, null, null, null); - + boolean exist = false; if (cursor != null) { if (cursor.getCount() > 0) { @@ -180,13 +146,14 @@ public class DataUtils { } return exist; } - + public static boolean checkVisibleFolderName(ContentResolver resolver, String name) { Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null, NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + " AND " + NoteColumns.SNIPPET + "=?", new String[] { name }, null); + //通过名字查询文件是否存在 boolean exist = false; if(cursor != null) { if(cursor.getCount() > 0) { @@ -196,14 +163,14 @@ public class DataUtils { } return exist; } - + public static HashSet getFolderNoteWidget(ContentResolver resolver, long folderId) { Cursor c = resolver.query(Notes.CONTENT_NOTE_URI, new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE }, NoteColumns.PARENT_ID + "=?", new String[] { String.valueOf(folderId) }, - null); - + null); //查询条件：父ID是传入的folderId; + HashSet set = null; if (c != null) { if (c.moveToFirst()) { @@ -211,26 +178,26 @@ public class DataUtils { do { try { AppWidgetAttribute widget = new AppWidgetAttribute(); - widget.widgetId = c.getInt(0); - widget.widgetType = c.getInt(1); + widget.widgetId = c.getInt(0); //0对应的NoteColumns.WIDGET_ID + widget.widgetType = c.getInt(1); //1对应的NoteColumns.WIDGET_TYPE set.add(widget); } catch (IndexOutOfBoundsException e) { Log.e(TAG, e.toString()); } - } while (c.moveToNext()); + } while (c.moveToNext()); //查询下一条 } c.close(); } return set; } - + public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI, new String [] { CallNote.PHONE_NUMBER }, CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?", new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE }, null); - + if (cursor != null && cursor.moveToFirst()) { try { return cursor.getString(0); @@ -242,7 +209,7 @@ public class DataUtils { } return ""; } - + public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) { Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI, new String [] { CallNote.NOTE_ID }, @@ -250,11 +217,12 @@ public class DataUtils { + CallNote.PHONE_NUMBER + ",?)", new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber }, null); - + //通过数据库操作，查询条件是（callDate和phoneNumber匹配传入参数的值） + if (cursor != null) { if (cursor.moveToFirst()) { try { - return cursor.getLong(0); + return cursor.getLong(0); //0对应的CallNote.NOTE_ID } catch (IndexOutOfBoundsException e) { Log.e(TAG, "Get call note id fails " + e.toString()); } @@ -263,14 +231,14 @@ public class DataUtils { } return 0; } - + public static String getSnippetById(ContentResolver resolver, long noteId) { Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, new String [] { NoteColumns.SNIPPET }, NoteColumns.ID + "=?", new String [] { String.valueOf(noteId)}, - null); - + null);//查询条件：noteId + if (cursor != null) { String snippet = ""; if (cursor.moveToFirst()) { @@ -281,8 +249,7 @@ public class DataUtils { } throw new IllegalArgumentException("Note is not found with id: " + noteId); } - - public static String getFormattedSnippet(String snippet) { + public static String getFormattedSnippet(String snippet) { //对字符串进行格式处理，将字符串两头的空格去掉，同时将换行符去掉 if (snippet != null) { snippet = snippet.trim(); int index = snippet.indexOf('\n'); @@ -292,4 +259,5 @@ public class DataUtils { } return snippet; } -} + +} \ No newline at end of file