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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.io.ByteSource;
import java.io.Closeable;
import java.io.IOException;
/**
* Byte source that can be closed. Closing a byte source allows releasing any resources associated
* with it. This should not be confused with closing streams. For example, {@link ByteTracker} uses
* {@code CloseableByteSources} to know when the data associated with the byte source can be
* released.
*/
public abstract class CloseableByteSource extends ByteSource implements Closeable {
/**
* Has the source been closed?
*/
private boolean mClosed;
/**
* Creates a new byte source.
*/
public CloseableByteSource() {
mClosed = false;
}
@Override
public final synchronized void close() throws IOException {
if (mClosed) {
return;
}
try {
innerClose();
} finally {
mClosed = true;
}
}
/**
* Closes the by source. This method is only invoked once, even if {@link #close()} is
* called multiple times
* @throws IOException failed to close
*/
protected abstract void innerClose() throws IOException;
}
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