org.elasticsearch.common.lucene.store.BufferedChecksumIndexOutput Maven / Gradle / Ivy
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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
/*
* Licensed to ElasticSearch and Shay Banon 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.elasticsearch.common.lucene.store;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.store.OpenBufferedIndexOutput;
import java.io.IOException;
import java.util.zip.Checksum;
/**
*/
public class BufferedChecksumIndexOutput extends OpenBufferedIndexOutput {
private final IndexOutput out;
private final Checksum digest;
public BufferedChecksumIndexOutput(IndexOutput out, Checksum digest) {
// we add 8 to be bigger than the default BufferIndexOutput buffer size so any flush will go directly
// to the output without being copied over to the delegate buffer
super(OpenBufferedIndexOutput.DEFAULT_BUFFER_SIZE + 64);
this.out = out;
this.digest = digest;
}
public Checksum digest() {
return digest;
}
public IndexOutput underlying() {
return this.out;
}
// 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 {
super.close();
out.close();
}
@Override
protected void flushBuffer(byte[] b, int offset, int len) throws IOException {
out.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 {
super.flush();
out.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);
out.seek(pos);
}
@Override
public long length() throws IOException {
return out.length();
}
@Override
public void setLength(long length) throws IOException {
out.setLength(length);
}
@Override
public String toString() {
return out.toString();
}
}