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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.apache.lucene.search.vectorhighlight;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.queries.FilterClause;
import org.apache.lucene.queries.TermFilter;
import org.apache.lucene.search.*;
import org.apache.lucene.search.spans.SpanTermQuery;
import org.apache.lucene.util.Version;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.common.lucene.search.MultiPhrasePrefixQuery;
import org.elasticsearch.common.lucene.search.XBooleanFilter;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.lucene.search.function.FiltersFunctionScoreQuery;
import org.elasticsearch.common.lucene.search.function.FunctionScoreQuery;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.List;
/**
*
*/
// LUCENE MONITOR
public class CustomFieldQuery extends FieldQuery {
private static Field multiTermQueryWrapperFilterQueryField;
static {
try {
multiTermQueryWrapperFilterQueryField = MultiTermQueryWrapperFilter.class.getDeclaredField("query");
multiTermQueryWrapperFilterQueryField.setAccessible(true);
} catch (NoSuchFieldException e) {
// ignore
}
}
public static final ThreadLocal<Boolean> highlightFilters = new ThreadLocal<Boolean>();
public CustomFieldQuery(Query query, IndexReader reader, FastVectorHighlighter highlighter) throws IOException {
this(query, reader, highlighter.isPhraseHighlight(), highlighter.isFieldMatch());
}
public CustomFieldQuery(Query query, IndexReader reader, boolean phraseHighlight, boolean fieldMatch) throws IOException {
super(query, reader, phraseHighlight, fieldMatch);
highlightFilters.remove();
}
@Override
void flatten(Query sourceQuery, IndexReader reader, Collection<Query> flatQueries) throws IOException {
if (sourceQuery instanceof SpanTermQuery) {
super.flatten(new TermQuery(((SpanTermQuery) sourceQuery).getTerm()), reader, flatQueries);
} else if (sourceQuery instanceof ConstantScoreQuery) {
ConstantScoreQuery constantScoreQuery = (ConstantScoreQuery) sourceQuery;
if (constantScoreQuery.getFilter() != null) {
flatten(constantScoreQuery.getFilter(), reader, flatQueries);
} else {
flatten(constantScoreQuery.getQuery(), reader, flatQueries);
}
} else if (sourceQuery instanceof FunctionScoreQuery) {
flatten(((FunctionScoreQuery) sourceQuery).getSubQuery(), reader, flatQueries);
} else if (sourceQuery instanceof FilteredQuery) {
flatten(((FilteredQuery) sourceQuery).getQuery(), reader, flatQueries);
flatten(((FilteredQuery) sourceQuery).getFilter(), reader, flatQueries);
} else if (sourceQuery instanceof XFilteredQuery) {
flatten(((XFilteredQuery) sourceQuery).getQuery(), reader, flatQueries);
flatten(((XFilteredQuery) sourceQuery).getFilter(), reader, flatQueries);
} else if (sourceQuery instanceof MultiPhrasePrefixQuery) {
flatten(sourceQuery.rewrite(reader), reader, flatQueries);
} else if (sourceQuery instanceof FiltersFunctionScoreQuery) {
flatten(((FiltersFunctionScoreQuery) sourceQuery).getSubQuery(), reader, flatQueries);
} else if (sourceQuery instanceof MultiPhraseQuery) {
MultiPhraseQuery q = ((MultiPhraseQuery) sourceQuery);
convertMultiPhraseQuery(0, new int[q.getTermArrays().size()] , q, q.getTermArrays(), q.getPositions(), reader, flatQueries);
} else {
super.flatten(sourceQuery, reader, flatQueries);
}
}
private void convertMultiPhraseQuery(int currentPos, int[] termsIdx, MultiPhraseQuery orig, List<Term[]> terms, int[] pos, IndexReader reader, Collection<Query> flatQueries) throws IOException {
if (currentPos == 0) {
// if we have more than 16 terms
int numTerms = 0;
for (Term[] currentPosTerm : terms) {
numTerms += currentPosTerm.length;
}
if (numTerms > 16) {
for (Term[] currentPosTerm : terms) {
for (Term term : currentPosTerm) {
super.flatten(new TermQuery(term), reader, flatQueries);
}
}
return;
}
}
/*
* we walk all possible ways and for each path down the MPQ we create a PhraseQuery this is what FieldQuery supports.
* It seems expensive but most queries will pretty small.
*/
if (currentPos == terms.size()) {
PhraseQuery query = new PhraseQuery();
query.setBoost(orig.getBoost());
query.setSlop(orig.getSlop());
for (int i = 0; i < termsIdx.length; i++) {
query.add(terms.get(i)[termsIdx[i]], pos[i]);
}
this.flatten(query, reader, flatQueries);
} else {
Term[] t = terms.get(currentPos);
for (int i = 0; i < t.length; i++) {
termsIdx[currentPos] = i;
convertMultiPhraseQuery(currentPos+1, termsIdx, orig, terms, pos, reader, flatQueries);
}
}
}
void flatten(Filter sourceFilter, IndexReader reader, Collection<Query> flatQueries) throws IOException {
Boolean highlight = highlightFilters.get();
if (highlight == null || highlight.equals(Boolean.FALSE)) {
return;
}
if (sourceFilter instanceof TermFilter) {
flatten(new TermQuery(((TermFilter) sourceFilter).getTerm()), reader, flatQueries);
} else if (sourceFilter instanceof MultiTermQueryWrapperFilter) {
if (multiTermQueryWrapperFilterQueryField != null) {
try {
flatten((Query) multiTermQueryWrapperFilterQueryField.get(sourceFilter), reader, flatQueries);
} catch (IllegalAccessException e) {
// ignore
}
}
} else if (sourceFilter instanceof XBooleanFilter) {
XBooleanFilter booleanFilter = (XBooleanFilter) sourceFilter;
for (FilterClause clause : booleanFilter.clauses()) {
if (clause.getOccur() == BooleanClause.Occur.MUST || clause.getOccur() == BooleanClause.Occur.SHOULD) {
flatten(clause.getFilter(), reader, flatQueries);
}
}
}
}
}
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