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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.phrase;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Terms;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.script.CompiledScript;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.search.suggest.DirectSpellcheckerSettings;
import org.elasticsearch.search.suggest.SuggestionSearchContext.SuggestionContext;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
class PhraseSuggestionContext extends SuggestionContext {
static final boolean DEFAULT_COLLATE_PRUNE = false;
static final boolean DEFAULT_REQUIRE_UNIGRAM = true;
static final float DEFAULT_CONFIDENCE = 1.0f;
static final int DEFAULT_GRAM_SIZE = 1;
static final float DEFAULT_RWE_ERRORLIKELIHOOD = 0.95f;
static final float DEFAULT_MAX_ERRORS = 0.5f;
static final String DEFAULT_SEPARATOR = " ";
static final WordScorer.WordScorerFactory DEFAULT_SCORER = (IndexReader reader, Terms terms, String field, double realWordLikelyhood,
BytesRef separator) -> new StupidBackoffScorer(reader, terms, field, realWordLikelyhood, separator, 0.4f);
private float maxErrors = DEFAULT_MAX_ERRORS;
private BytesRef separator = new BytesRef(DEFAULT_SEPARATOR);
private float realworldErrorLikelihood = DEFAULT_RWE_ERRORLIKELIHOOD;
private int gramSize = DEFAULT_GRAM_SIZE;
private float confidence = DEFAULT_CONFIDENCE;
private int tokenLimit = NoisyChannelSpellChecker.DEFAULT_TOKEN_LIMIT;
private boolean requireUnigram = DEFAULT_REQUIRE_UNIGRAM;
private BytesRef preTag;
private BytesRef postTag;
private Function