package org.apache.lucene.util.encoding;
import java.io.IOException;
import java.io.InputStream;
/*
* 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.
*/
/**
* An {@link IntDecoder} which wraps another {@link IntDecoder} and reverts the
* d-gap that was encoded by {@link DGapIntEncoder}. The wrapped decoder
* performs the actual decoding, while this class simply adds the decoded value
* to the previous value.
*
* @lucene.experimental
*/
public class DGapIntDecoder extends IntDecoder {
private final IntDecoder decoder;
private int prev = 0;
public DGapIntDecoder(IntDecoder decoder) {
this.decoder = decoder;
}
@Override
public long decode() throws IOException {
long decode = decoder.decode();
if (decode == EOS) {
return EOS;
}
return prev += decode;
}
@Override
public void reInit(InputStream in) {
decoder.reInit(in);
prev = 0;
}
@Override
public String toString() {
return "DGap (" + decoder.toString() + ")";
}
}