/**
* 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.avro.file.codec;
import org.apache.avro.file.Codec;
import java.io.IOException;
import java.nio.*;
/**
* Simple Custom Codec to validate making Codec Public
* Compress and Decompress operations are just bitwise-NOT of data
*/
public class CustomCodec extends Codec {
private static final String CODECNAME = "CUSTOMCODEC";
@Override
public String getName() {
return CODECNAME;
}
@Override
public ByteBuffer compress(ByteBuffer in) throws IOException {
ByteBuffer out = ByteBuffer.allocate(in.remaining());
while (in.position() < in.capacity())
out.put((byte) ~in.get());
return out;
}
@Override
public ByteBuffer decompress(ByteBuffer in) throws IOException {
ByteBuffer out = ByteBuffer.allocate(in.remaining());
while (in.position() < in.capacity())
out.put((byte) ~in.get());
return out;
}
@Override
public boolean equals(Object other) {
if (this == other)
return true;
if (other instanceof Codec) {
ByteBuffer original = ByteBuffer.allocate(getName().getBytes().length);
original.put(getName().getBytes());
original.rewind();
try {
return compareDecompress((Codec) other, original);
} catch (IOException e) {
return false;
}
} else
return false;
}
/**
* Codecs must implement an equals() method. Two codecs, A and B are equal
* if: the result of A and B decompressing content compressed by A is the same
* AND the retult of A and B decompressing content compressed by B is the same
*/
private boolean compareDecompress(Codec other, ByteBuffer original) throws IOException {
ByteBuffer compressedA = this.compress(original);
original.rewind();
ByteBuffer compressedB = other.compress(original);
if (this.decompress(compressedA).equals(other.decompress((ByteBuffer) compressedA.rewind())) &&
this.decompress(compressedB).equals(other.decompress((ByteBuffer) compressedB.rewind()))
) {
return true;
}
return false;
}
@Override
public int hashCode() {
return getName().hashCode();
}
}