org.fusesource.hawtbuf.codec.VarSignedIntegerCodec Maven / Gradle / Ivy
/**
* 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.fusesource.hawtbuf.codec;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* Implementation of a variable length Codec for a signed Integer
*
*/
public class VarSignedIntegerCodec extends VarIntegerCodec {
public static final VarSignedIntegerCodec INSTANCE = new VarSignedIntegerCodec();
public void encode(Integer value, DataOutput dataOut) throws IOException {
super.encode(encodeZigZag(value), dataOut);
}
public Integer decode(DataInput dataIn) throws IOException {
return decodeZigZag(super.decode(dataIn));
}
private static int decodeZigZag(int n) {
return (n >>> 1) ^ -(n & 1);
}
private static int encodeZigZag(int n) {
return (n << 1) ^ (n >> 31);
}
public int estimatedSize(Integer value) {
return super.estimatedSize(encodeZigZag(value));
}
}