| /* |
| * Copyright 2011 Google Inc. |
| * |
| * 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.google.gwt.dev.util; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| |
| /** |
| * Wrapper around a {@link DiskCache} token that allows easy serialization. |
| */ |
| public class DiskCacheToken implements Serializable { |
| |
| private transient DiskCache diskCache; |
| private transient long token; |
| |
| /** |
| * Create a wrapper for a token associated with {@link DiskCache#INSTANCE}. |
| */ |
| public DiskCacheToken(long token) { |
| this(DiskCache.INSTANCE, token); |
| } |
| |
| /** |
| * Create a wrapper for a token associated with the given diskCache. |
| */ |
| DiskCacheToken(DiskCache diskCache, long token) { |
| assert token >= 0; |
| this.diskCache = diskCache; |
| this.token = token; |
| } |
| |
| /** |
| * Retrieve the underlying bytes. |
| * |
| * @return the bytes that were written |
| */ |
| public synchronized byte[] readByteArray() { |
| return diskCache.readByteArray(token); |
| } |
| |
| /** |
| * Deserialize the underlying bytes as an object. |
| * |
| * @param <T> the type of the object to deserialize |
| * @param type the type of the object to deserialize |
| * @return the deserialized object |
| */ |
| public <T> T readObject(Class<T> type) { |
| return diskCache.readObject(token, type); |
| } |
| |
| private void readObject(ObjectInputStream inputStream) throws IOException { |
| diskCache = DiskCache.INSTANCE; |
| token = diskCache.transferFromStream(inputStream); |
| } |
| |
| private void writeObject(ObjectOutputStream outputStream) throws IOException { |
| diskCache.transferToStream(token, outputStream); |
| } |
| } |