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/*
* 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 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;
private static final int VERSION_ADD_ROOT = 2;
public RootInfo root;
public String getTitle() {
if (size() == 1 && root != null) {
return root.title;
} else if (size() > 1) {
return peek().displayName;
} else {
return null;
}
}
public boolean isRecents() {
return size() == 0;
}
@Override
public void reset() {
clear();
root = null;
}
@Override
public void read(DataInputStream in) throws IOException {
final int version = in.readInt();
switch (version) {
case VERSION_INIT:
throw new ProtocolException("Ignored upgrade");
case VERSION_ADD_ROOT:
if (in.readBoolean()) {
root = new RootInfo();
root.read(in);
}
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_ADD_ROOT);
if (root != null) {
out.writeBoolean(true);
root.write(out);
} else {
out.writeBoolean(false);
}
final int size = size();
out.writeInt(size);
for (int i = 0; i < size; i++) {
final DocumentInfo doc = get(i);
doc.write(out);
}
}
}
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