org.apache.cassandra.index.sai.disk.io.BufferedChecksumIndexInput Maven / Gradle / Ivy
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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.cassandra.index.sai.disk.io;
import org.apache.lucene.store.ChecksumIndexInput;
import org.apache.lucene.store.IndexInput;
import java.io.IOException;
import java.util.zip.Checksum;
/**
* This implementation of {@link ChecksumIndexInput} is based on {@link org.apache.lucene.store.BufferedChecksumIndexInput}
* but uses custom checksum algorithm instead of the hardcoded {@code CRC32} in {@code BufferedChecksumIndexInput}.
*
* @see org.apache.cassandra.index.sai.disk.io.IndexFileUtils.ChecksummingWriter
*/
class BufferedChecksumIndexInput extends ChecksumIndexInput
{
final IndexInput delegate;
final Checksum digest;
public BufferedChecksumIndexInput(IndexInput delegate, Checksum digest)
{
super("BufferedChecksumIndexInput(" + delegate + ')');
this.delegate = delegate;
this.digest = digest;
}
public byte readByte() throws IOException
{
byte b = this.delegate.readByte();
this.digest.update(b);
return b;
}
public void readBytes(byte[] b, int offset, int len) throws IOException
{
this.delegate.readBytes(b, offset, len);
this.digest.update(b, offset, len);
}
public long getChecksum()
{
return this.digest.getValue();
}
public void close() throws IOException
{
this.delegate.close();
}
public long getFilePointer()
{
return this.delegate.getFilePointer();
}
public long length()
{
return this.delegate.length();
}
public IndexInput clone()
{
throw new UnsupportedOperationException();
}
public IndexInput slice(String sliceDescription, long offset, long length) throws IOException
{
throw new UnsupportedOperationException();
}
}