org.apache.lucene.search.spell.SuggestWordFrequencyComparator.java Source code

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Here is the source code for org.apache.lucene.search.spell.SuggestWordFrequencyComparator.java

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/*
 * 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.apache.lucene.search.spell;

import java.util.Comparator;

/**
 *  Frequency first, then score.
 *
 **/
public class SuggestWordFrequencyComparator implements Comparator<SuggestWord> {

    /**
     * Creates a new comparator that will compare by {@link SuggestWord#freq},
     * then by {@link SuggestWord#score}, then by {@link SuggestWord#string}.
     */
    public SuggestWordFrequencyComparator() {
    }

    @Override
    public int compare(SuggestWord first, SuggestWord second) {
        // first criteria: the frequency
        if (first.freq > second.freq) {
            return 1;
        }
        if (first.freq < second.freq) {
            return -1;
        }

        // second criteria (if first criteria is equal): the score
        if (first.score > second.score) {
            return 1;
        }
        if (first.score < second.score) {
            return -1;
        }
        // third criteria: term text
        return second.string.compareTo(first.string);
    }
}