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/*
* Copyright (C) 2016 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.apkzlib.zip.utils;
import com.google.common.hash.HashCode;
import com.google.common.hash.HashFunction;
import com.google.common.io.ByteProcessor;
import com.google.common.io.ByteSink;
import com.google.common.io.ByteSource;
import com.google.common.io.CharSource;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Closeable byte source that delegates to another byte source.
*/
public class CloseableDelegateByteSource extends CloseableByteSource {
/**
* The byte source we delegate all operations to. {@code null} if disposed.
*/
@Nullable
private ByteSource inner;
/**
* Size of the byte source. This is the same as {@code inner.size()} (when {@code inner}
* is not {@code null}), but we keep it separate to avoid calling {@code inner.size()}
* because it might throw {@code IOException}.
*/
private final long mSize;
/**
* Creates a new byte source.
*
* @param inner the inner byte source
* @param size the size of the source
*/
public CloseableDelegateByteSource(@Nonnull ByteSource inner, long size) {
this.inner = inner;
mSize = size;
}
/**
* Obtains the inner byte source. Will throw an exception if the inner by byte source has
* been disposed of.
*
* @return the inner byte source
*/
@Nonnull
private synchronized ByteSource get() {
if (inner == null) {
throw new ByteSourceDisposedException();
}
return inner;
}
/**
* Mark the byte source as disposed.
*/
@Override
protected synchronized void innerClose() throws IOException {
if (inner == null) {
return;
}
inner = null;
}
/**
* Obtains the size of this byte source. Equivalent to {@link #size()} but not throwing
* {@code IOException}.
*
* @return the size of the byte source
*/
public long sizeNoException() {
return mSize;
}
@Override
public CharSource asCharSource(Charset charset) {
return get().asCharSource(charset);
}
@Override
public InputStream openBufferedStream() throws IOException {
return get().openBufferedStream();
}
@Override
public ByteSource slice(long offset, long length) {
return get().slice(offset, length);
}
@Override
public boolean isEmpty() throws IOException {
return get().isEmpty();
}
@Override
public long size() throws IOException {
return get().size();
}
@Override
public long copyTo(@Nonnull OutputStream output) throws IOException {
return get().copyTo(output);
}
@Override
public long copyTo(@Nonnull ByteSink sink) throws IOException {
return get().copyTo(sink);
}
@Override
public byte[] read() throws IOException {
return get().read();
}
@Override
public <T> T read(@Nonnull ByteProcessor<T> processor) throws IOException {
return get().read(processor);
}
@Override
public HashCode hash(HashFunction hashFunction) throws IOException {
return get().hash(hashFunction);
}
@Override
public boolean contentEquals(@Nonnull ByteSource other) throws IOException {
return get().contentEquals(other);
}
@Override
public InputStream openStream() throws IOException {
return get().openStream();
}
/**
* Exception thrown when trying to use a byte source that has been disposed.
*/
private static class ByteSourceDisposedException extends RuntimeException {
/**
* Creates a new exception.
*/
private ByteSourceDisposedException() {
super("Byte source was created by a ByteTracker and is now disposed. If you see "
+ "this message, then there is a bug.");
}
}
}
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