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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.apache.lucene.store;
import java.io.IOException;
import java.util.zip.Checksum;
/**
*/
public class BufferedChecksumIndexOutput extends BufferedIndexOutput {
private final IndexOutput delegate;
private final BufferedIndexOutput bufferedDelegate;
private final Checksum digest;
public BufferedChecksumIndexOutput(IndexOutput delegate, Checksum digest) {
super(delegate instanceof BufferedIndexOutput ? ((BufferedIndexOutput) delegate).getBufferSize() : BufferedIndexOutput.DEFAULT_BUFFER_SIZE);
if (delegate instanceof BufferedIndexOutput) {
bufferedDelegate = (BufferedIndexOutput) delegate;
this.delegate = delegate;
} else {
this.delegate = delegate;
bufferedDelegate = null;
}
this.digest = digest;
}
public Checksum digest() {
return digest;
}
public IndexOutput underlying() {
return this.delegate;
}
// don't override it, base class method simple reads from input and writes to this output
// @Override public void copyBytes(IndexInput input, long numBytes) throws IOException {
// delegate.copyBytes(input, numBytes);
// }
@Override
public void close() throws IOException {
try {
super.close();
} finally {
delegate.close();
}
}
@Override
protected void flushBuffer(byte[] b, int offset, int len) throws IOException {
if (bufferedDelegate != null) {
bufferedDelegate.flushBuffer(b, offset, len);
} else {
delegate.writeBytes(b, offset, len);
}
digest.update(b, offset, len);
}
// don't override it, base class method simple reads from input and writes to this output
// @Override public void copyBytes(IndexInput input, long numBytes) throws IOException {
// delegate.copyBytes(input, numBytes);
// }
@Override
public void flush() throws IOException {
try {
super.flush();
} finally {
delegate.flush();
}
}
@Override
public void seek(long pos) throws IOException {
// seek might be called on files, which means that the checksum is not file checksum
// but a checksum of the bytes written to this stream, which is the same for each
// type of file in lucene
super.seek(pos);
delegate.seek(pos);
}
@Override
public long length() throws IOException {
return delegate.length();
}
@Override
public void setLength(long length) throws IOException {
delegate.setLength(length);
}
@Override
public String toString() {
return delegate.toString();
}
}
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