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/*
* Copyright (C) 2012 Google Inc.
* Licensed to The Android Open Source Project.
*
* 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 com.android.mail.ui;
import android.os.Parcel;
import android.os.Parcelable;
import com.android.mail.providers.Folder;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
public class FolderOperation implements Parcelable {
/** An immutable, empty conversation list */
public static final Collection<FolderOperation> EMPTY = Collections.emptyList();
public final Folder mFolder;
public final boolean mAdd;
public FolderOperation(Folder folder, Boolean operation) {
mAdd = operation;
mFolder = folder;
}
/**
* Get all the unique folders associated with a set of folder operations.
* @param ops Operations to inspect
* @return ArrayList of Folder objects
*/
public static ArrayList<Folder> getFolders(Collection<FolderOperation> ops) {
HashSet<Folder> folders = new HashSet<Folder>();
for (FolderOperation op : ops) {
folders.add(op.mFolder);
}
return new ArrayList<Folder>(folders);
}
/**
* Returns a collection of a single FolderOperation. This method always
* returns a valid collection even if the input folder is null.
*
* @param in a FolderOperation, possibly null.
* @return a collection of the folder.
*/
public static Collection<FolderOperation> listOf(FolderOperation in) {
final Collection<FolderOperation> target = (in == null) ? EMPTY : ImmutableList.of(in);
return target;
}
/**
* Return if a set of folder operations removes the specified folder or adds
* inbox to a trashed conversation, making it a destructive operation.
*/
public static boolean isDestructive(Collection<FolderOperation> folderOps, Folder folder) {
for (FolderOperation op : folderOps) {
if (Objects.equal(op.mFolder, folder) && !op.mAdd) {
return true;
}
if (folder.isTrash() && op.mFolder.isInbox()) {
return true;
}
}
return false;
}
// implements Parcelable
FolderOperation(Parcel in) {
mAdd = in.readByte() != 0;
mFolder = in.readParcelable(getClass().getClassLoader());
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeByte((byte)(mAdd ? 1 : 0));
dest.writeParcelable(mFolder, 0);
}
public static final Creator<FolderOperation> CREATOR = new Creator<FolderOperation>() {
@Override
public FolderOperation createFromParcel(Parcel source) {
return new FolderOperation(source);
}
@Override
public FolderOperation[] newArray(int size) {
return new FolderOperation[size];
}
};
}
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