+++ /dev/null
-package org.apache.lucene.util.encoding;
-
-import java.io.IOException;
-import java.io.OutputStream;
-
-/**
- * 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 IntEncoderFilter} which ensures only unique values are encoded. The
- * implementation assumes the values given to {@link #encode(int)} are sorted.
- * If this is not the case, you can chain this encoder with
- * {@link SortingIntEncoder}.
- *
- * @lucene.experimental
- */
-public final class UniqueValuesIntEncoder extends IntEncoderFilter {
-
- /**
- * Denotes an illegal value which we can use to init 'prev' to. Since all
- * encoded values are integers, this value is init to MAX_INT+1 and is of type
- * long. Therefore we are guaranteed not to get this value in encode.
- */
- private static final long ILLEGAL_VALUE = Integer.MAX_VALUE + 1;
-
- private long prev = ILLEGAL_VALUE;
-
- /** Constructs a new instance with the given encoder. */
- public UniqueValuesIntEncoder(IntEncoder encoder) {
- super(encoder);
- }
-
- @Override
- public void encode(int value) throws IOException {
- if (prev != value) {
- encoder.encode(value);
- prev = value;
- }
- }
-
- @Override
- public IntDecoder createMatchingDecoder() {
- return encoder.createMatchingDecoder();
- }
-
- @Override
- public void reInit(OutputStream out) {
- super.reInit(out);
- prev = ILLEGAL_VALUE;
- }
-
- @Override
- public String toString() {
- return "Unique (" + encoder.toString() + ")";
- }
-
-}