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package org.apache.lucene.util.encoding;
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import java.io.IOException;
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import java.io.InputStream;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* Decodes data which was encoded by {@link NOnesIntEncoder}. Uses a
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* {@link FourFlagsIntDecoder} to perform the actual encoding and translates the
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* values back as described in {@link NOnesIntEncoder}.
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* @see NOnesIntEncoder
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* @lucene.experimental
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public class NOnesIntDecoder extends FourFlagsIntDecoder {
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/** Number of consecutive '1's to generate upon decoding a '2'. */
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private int onesCounter;
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* Constructs a decoder with a given N (Number of consecutive '1's which are
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* translated into a single target value '2'.
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public NOnesIntDecoder(int n) {
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public long decode() throws IOException {
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// If we read '2', we should return n '1's.
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if (onesCounter > 0) {
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long decode = super.decode();
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return decode == EOS ? EOS : decode - 1;
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public void reInit(InputStream in) {
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public String toString() {
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return "NOnes (" + n + ") (" + super.toString() + ")";