1 /******************************************************************************* 2 * Copyright (C) 2013 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 *******************************************************************************/ 17 package com.android.mail.browse; 18 19 import android.database.Cursor; 20 import android.database.CursorWrapper; 21 22 public interface ConversationCursorOperationListener { 23 /** 24 * Marks all contents of this cursor as seen. 25 */ 26 void markContentsSeen(); 27 28 /** 29 * Empties the folder of all messages, if possible. 30 */ 31 void emptyFolder(); 32 33 public class OperationHelper { 34 /** 35 * Invokes {@link ConversationCursorOperationListener#markContentsSeen(Cursor)} on the 36 * specified {@link Cursor}, recursively calls {@link #markContentsSeen(Cursor)} on a 37 * wrapped cursor, or returns. 38 */ 39 public static void markContentsSeen(final Cursor cursor) { 40 if (cursor == null) { 41 return; 42 } 43 44 if (cursor instanceof ConversationCursorOperationListener) { 45 ((ConversationCursorOperationListener) cursor).markContentsSeen(); 46 } else if (cursor instanceof CursorWrapper) { 47 markContentsSeen(((CursorWrapper) cursor).getWrappedCursor()); 48 } 49 } 50 51 /** 52 * Invokes {@link ConversationCursorOperationListener#emptyFolder(Cursor)} on the 53 * specified {@link Cursor}, recursively calls {@link #emptyFolder(Cursor)} on a 54 * wrapped cursor, or returns. 55 */ 56 public static void emptyFolder(final Cursor cursor) { 57 if (cursor == null) { 58 return; 59 } 60 61 if (cursor instanceof ConversationCursorOperationListener) { 62 ((ConversationCursorOperationListener) cursor).emptyFolder(); 63 } else if (cursor instanceof CursorWrapper) { 64 emptyFolder(((CursorWrapper) cursor).getWrappedCursor()); 65 } 66 } 67 } 68 } 69
