/**
* Copyright 2014 National University of Ireland, Galway.
*
* This file is part of the SIREn project. Project and contact information:
*
* https://github.com/rdelbru/SIREn
*
* Licensed 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.sindice.siren.index.codecs.block;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IntsRef;
import org.sindice.siren.index.codecs.block.AForFrameDecompressor.FrameDecompressor;
/**
* Implementation of {@link BlockDecompressor} based on the Adaptive Frame Of
* Reference algorithm.
*
* @see AForBlockCompressor
*/
public class AForBlockDecompressor extends BlockDecompressor {
protected final FrameDecompressor[] decompressors = AForFrameDecompressor.decompressors;
@Override
public void decompress(final BytesRef input, final IntsRef output) {
assert output.ints.length % 32 == 0;
final byte[] compressedArray = input.bytes;
while (input.offset < input.length) {
this.decompressors[compressedArray[input.offset]].decompress(input, output);
}
// flip buffer
input.offset = 0;
output.length = output.offset;
output.offset = 0;
}
@Override
public int getWindowSize() {
return AForBlockCompressor.MAX_FRAME_SIZE;
}
}