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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.suggest;
import org.apache.lucene.search.spell.DirectSpellChecker;
import org.apache.lucene.search.spell.StringDistance;
import org.apache.lucene.search.spell.SuggestMode;
import org.apache.lucene.search.spell.SuggestWord;
import org.apache.lucene.search.spell.SuggestWordFrequencyComparator;
import org.apache.lucene.search.spell.SuggestWordQueue;
import org.apache.lucene.util.automaton.LevenshteinAutomata;
import java.util.Comparator;
public class DirectSpellcheckerSettings {
// NB: If this changes, make sure to change the default in TermBuilderSuggester
public static SuggestMode DEFAULT_SUGGEST_MODE = SuggestMode.SUGGEST_WHEN_NOT_IN_INDEX;
public static float DEFAULT_ACCURACY = 0.5f;
public static SortBy DEFAULT_SORT = SortBy.SCORE;
// NB: If this changes, make sure to change the default in TermBuilderSuggester
public static StringDistance DEFAULT_STRING_DISTANCE = DirectSpellChecker.INTERNAL_LEVENSHTEIN;
public static int DEFAULT_MAX_EDITS = LevenshteinAutomata.MAXIMUM_SUPPORTED_DISTANCE;
public static int DEFAULT_MAX_INSPECTIONS = 5;
public static float DEFAULT_MAX_TERM_FREQ = 0.01f;
public static int DEFAULT_PREFIX_LENGTH = 1;
public static int DEFAULT_MIN_WORD_LENGTH = 4;
public static float DEFAULT_MIN_DOC_FREQ = 0f;
private SuggestMode suggestMode = DEFAULT_SUGGEST_MODE;
private float accuracy = DEFAULT_ACCURACY;
private SortBy sort = DEFAULT_SORT;
private StringDistance stringDistance = DEFAULT_STRING_DISTANCE;
private int maxEdits = DEFAULT_MAX_EDITS;
private int maxInspections = DEFAULT_MAX_INSPECTIONS;
private float maxTermFreq = DEFAULT_MAX_TERM_FREQ;
private int prefixLength = DEFAULT_PREFIX_LENGTH;
private int minWordLength = DEFAULT_MIN_WORD_LENGTH;
private float minDocFreq = DEFAULT_MIN_DOC_FREQ;
private static final Comparator<SuggestWord> LUCENE_FREQUENCY = new SuggestWordFrequencyComparator();
private static final Comparator<SuggestWord> SCORE_COMPARATOR = SuggestWordQueue.DEFAULT_COMPARATOR;
public SuggestMode suggestMode() {
return suggestMode;
}
public void suggestMode(SuggestMode suggestMode) {
this.suggestMode = suggestMode;
}
public float accuracy() {
return accuracy;
}
public void accuracy(float accuracy) {
this.accuracy = accuracy;
}
public SortBy sort() {
return sort;
}
public void sort(SortBy sort) {
this.sort = sort;
}
public StringDistance stringDistance() {
return stringDistance;
}
public void stringDistance(StringDistance distance) {
this.stringDistance = distance;
}
public int maxEdits() {
return maxEdits;
}
public void maxEdits(int maxEdits) {
this.maxEdits = maxEdits;
}
public int maxInspections() {
return maxInspections;
}
public void maxInspections(int maxInspections) {
this.maxInspections = maxInspections;
}
public float maxTermFreq() {
return maxTermFreq;
}
public void maxTermFreq(float maxTermFreq) {
this.maxTermFreq = maxTermFreq;
}
public int prefixLength() {
return prefixLength;
}
public void prefixLength(int prefixLength) {
this.prefixLength = prefixLength;
}
public int minWordLength() {
return minWordLength;
}
public void minWordLength(int minWordLength) {
this.minWordLength = minWordLength;
}
public float minDocFreq() {
return minDocFreq;
}
public void minDocFreq(float minDocFreq) {
this.minDocFreq = minDocFreq;
}
public DirectSpellChecker createDirectSpellChecker() {
DirectSpellChecker directSpellChecker = new DirectSpellChecker();
directSpellChecker.setAccuracy(accuracy());
Comparator<SuggestWord> comparator;
switch (sort()) {
case SCORE:
comparator = SCORE_COMPARATOR;
break;
case FREQUENCY:
comparator = LUCENE_FREQUENCY;
break;
default:
throw new IllegalArgumentException("Illegal suggest sort: " + sort());
}
directSpellChecker.setComparator(comparator);
directSpellChecker.setDistance(stringDistance());
directSpellChecker.setMaxEdits(maxEdits());
directSpellChecker.setMaxInspections(maxInspections());
directSpellChecker.setMaxQueryFrequency(maxTermFreq());
directSpellChecker.setMinPrefix(prefixLength());
directSpellChecker.setMinQueryLength(minWordLength());
directSpellChecker.setThresholdFrequency(minDocFreq());
directSpellChecker.setLowerCaseTerms(false);
return directSpellChecker;
}
@Override
public String toString() {
return "[" +
"suggestMode=" + suggestMode +
",sort=" + sort +
",stringDistance=" + stringDistance +
",accuracy=" + accuracy +
",maxEdits=" + maxEdits +
",maxInspections=" + maxInspections +
",maxTermFreq=" + maxTermFreq +
",prefixLength=" + prefixLength +
",minWordLength=" + minWordLength +
",minDocFreq=" + minDocFreq +
"]";
}
}
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