1 /* 2 * Copyright (C) 2012 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 18 package com.android.mail.ui; 19 20 import com.android.mail.providers.Folder; 21 import com.google.common.base.Objects; 22 import com.google.common.collect.ImmutableList; 23 24 import java.util.ArrayList; 25 import java.util.Collection; 26 import java.util.Collections; 27 import java.util.HashSet; 28 29 public class FolderOperation { 30 /** An immutable, empty conversation list */ 31 public static final Collection<FolderOperation> EMPTY = Collections.emptyList(); 32 public Folder mFolder; 33 public boolean mAdd; 34 35 public FolderOperation(Folder folder, Boolean operation) { 36 mAdd = operation; 37 mFolder = folder; 38 } 39 40 /** 41 * Get all the unique folders associated with a set of folder operations. 42 * @param ops 43 * @return 44 */ 45 public final static ArrayList<Folder> getFolders(Collection<FolderOperation> ops) { 46 HashSet<Folder> folders = new HashSet<Folder>(); 47 for (FolderOperation op : ops) { 48 folders.add(op.mFolder); 49 } 50 return new ArrayList<Folder>(folders); 51 } 52 53 /** 54 * Returns a collection of a single FolderOperation. This method always 55 * returns a valid collection even if the input folder is null. 56 * 57 * @param in a FolderOperation, possibly null. 58 * @return a collection of the folder. 59 */ 60 public static Collection<FolderOperation> listOf(FolderOperation in) { 61 final Collection<FolderOperation> target = (in == null) ? EMPTY : ImmutableList.of(in); 62 return target; 63 } 64 65 /** 66 * Return if a set of folder operations removes the specified folder or adds 67 * inbox to a trashed conversation, making it a destructive operation. 68 */ 69 public static boolean isDestructive(Collection<FolderOperation> folderOps, Folder folder) { 70 for (FolderOperation op : folderOps) { 71 if (Objects.equal(op.mFolder, folder) && !op.mAdd) { 72 return true; 73 } 74 if (folder.isTrash() && op.mFolder.isInbox()) { 75 return true; 76 } 77 } 78 return false; 79 } 80 } 81
