com.stratio.cassandra.lucene.search.condition.BooleanCondition Maven / Gradle / Ivy
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* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. The STRATIO (C) 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
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package com.stratio.cassandra.lucene.search.condition;
import com.google.common.base.Objects;
import com.stratio.cassandra.lucene.schema.Schema;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.LinkedList;
import java.util.List;
import static org.apache.lucene.search.BooleanClause.Occur.*;
/**
* A {@link Condition} that matches documents matching boolean combinations of other queries, e.g. {@link
* MatchCondition}s, {@link RangeCondition}s or other {@link BooleanCondition}s.
*
* @author Andres de la Pena {@literal }
*/
public class BooleanCondition extends Condition {
private static final Logger logger = LoggerFactory.getLogger(BooleanCondition.class);
/** The mandatory conditions. */
public final List must;
/** The optional conditions. */
public final List should;
/** The mandatory not conditions. */
public final List not;
/**
* Returns a new {@link BooleanCondition} compound by the specified {@link Condition}s.
*
* @param boost The boost for this query clause. Documents matching this clause will (in addition to the normal
* weightings) have their score multiplied by {@code boost}. If {@code null}, then {@link
* #DEFAULT_BOOST} is used as default.
* @param must the mandatory {@link Condition}s.
* @param should the optional {@link Condition}s.
* @param not the mandatory not {@link Condition}s.
*/
public BooleanCondition(Float boost, List must, List should, List not) {
super(boost);
this.must = must == null ? new LinkedList() : must;
this.should = should == null ? new LinkedList() : should;
this.not = not == null ? new LinkedList() : not;
}
/** {@inheritDoc} */
@Override
public Query query(Schema schema) {
BooleanQuery.Builder builder = new BooleanQuery.Builder();
for (Condition condition : must) {
builder.add(condition.query(schema), MUST);
}
for (Condition condition : should) {
builder.add(condition.query(schema), SHOULD);
}
for (Condition condition : not) {
builder.add(condition.query(schema), MUST_NOT);
}
if (must.isEmpty() && should.isEmpty() && !not.isEmpty()) {
logger.warn("Performing resource-intensive pure negation search");
builder.add(new MatchAllDocsQuery(), FILTER);
}
Query query = builder.build();
query.setBoost(boost);
return query;
}
/** {@inheritDoc} */
@Override
public String toString() {
return Objects.toStringHelper(this)
.add("boost", boost)
.add("must", must)
.add("should", should)
.add("not", not)
.toString();
}
}