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HighlightUtils.java
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HighlightUtils.java
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/*
* Licensed to ElasticSearch and Shay Banon 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.highlight;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import org.apache.lucene.search.highlight.DefaultEncoder;
import org.apache.lucene.search.highlight.Encoder;
import org.apache.lucene.search.highlight.SimpleHTMLEncoder;
import org.elasticsearch.index.fieldvisitor.CustomFieldsVisitor;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.lookup.SearchLookup;
import java.io.IOException;
import java.util.List;
public final class HighlightUtils {
//U+2029 PARAGRAPH SEPARATOR (PS): each value holds a discrete passage for highlighting (postings highlighter)
public static final char PARAGRAPH_SEPARATOR = 8233;
private HighlightUtils() {
}
static List<Object> loadFieldValues(FieldMapper<?> mapper, SearchContext searchContext, FetchSubPhase.HitContext hitContext, boolean forceSource) throws IOException {
List<Object> textsToHighlight;
if (!forceSource && mapper.fieldType().stored()) {
CustomFieldsVisitor fieldVisitor = new CustomFieldsVisitor(ImmutableSet.of(mapper.names().indexName()), false);
hitContext.reader().document(hitContext.docId(), fieldVisitor);
textsToHighlight = fieldVisitor.fields().get(mapper.names().indexName());
if (textsToHighlight == null) {
// Can happen if the document doesn't have the field to highlight
textsToHighlight = ImmutableList.of();
}
} else {
SearchLookup lookup = searchContext.lookup();
lookup.setNextReader(hitContext.readerContext());
lookup.setNextDocId(hitContext.docId());
textsToHighlight = lookup.source().extractRawValues(mapper.names().sourcePath());
}
assert textsToHighlight != null;
return textsToHighlight;
}
static class Encoders {
static Encoder DEFAULT = new DefaultEncoder();
static Encoder HTML = new SimpleHTMLEncoder();
}
}