| /* |
| * Copyright (C) 2013 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.documentsui.model; |
| |
| import com.android.documentsui.RootsCache; |
| |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.net.ProtocolException; |
| import java.util.LinkedList; |
| |
| /** |
| * Representation of a stack of {@link DocumentInfo}, usually the result of a |
| * user-driven traversal. |
| */ |
| public class DocumentStack extends LinkedList<DocumentInfo> implements Durable { |
| private static final int VERSION_INIT = 1; |
| |
| public RootInfo getRoot(RootsCache roots) { |
| return roots.findRoot(getLast().uri); |
| } |
| |
| public String getTitle(RootsCache roots) { |
| if (size() == 1) { |
| return getRoot(roots).title; |
| } else if (size() > 1) { |
| return peek().displayName; |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public void reset() { |
| clear(); |
| } |
| |
| @Override |
| public void read(DataInputStream in) throws IOException { |
| final int version = in.readInt(); |
| switch (version) { |
| case VERSION_INIT: |
| final int size = in.readInt(); |
| for (int i = 0; i < size; i++) { |
| final DocumentInfo doc = new DocumentInfo(); |
| doc.read(in); |
| add(doc); |
| } |
| break; |
| default: |
| throw new ProtocolException("Unknown version " + version); |
| } |
| } |
| |
| @Override |
| public void write(DataOutputStream out) throws IOException { |
| out.writeInt(VERSION_INIT); |
| final int size = size(); |
| out.writeInt(size); |
| for (int i = 0; i < size; i++) { |
| final DocumentInfo doc = get(i); |
| doc.write(out); |
| } |
| } |
| } |