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* the Apache License, Version 2.0 (the "License"); you may
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* 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
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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(SearchContextHighlight.Field field, FieldMapper<?> mapper, SearchContext searchContext, FetchSubPhase.HitContext hitContext) throws IOException {
//percolator needs to always load from source, thus it sets the global force source to true
boolean forceSource = searchContext.highlight().forceSource(field);
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(hitContext.getSourcePath(mapper.names().sourcePath()));
}
assert textsToHighlight != null;
return textsToHighlight;
}
static class Encoders {
static Encoder DEFAULT = new DefaultEncoder();
static Encoder HTML = new SimpleHTMLEncoder();
}
}