com.stratio.cassandra.lucene.search.condition.PrefixCondition Maven / Gradle / Ivy
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/*
* Copyright (C) 2014 Stratio (http://stratio.com)
*
* Licensed 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 com.stratio.cassandra.lucene.search.condition;
import com.google.common.base.MoreObjects;
import com.stratio.cassandra.lucene.IndexException;
import com.stratio.cassandra.lucene.schema.mapping.SingleColumnMapper;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
/**
* A {@link Condition} implementation that matches documents containing terms with a specified prefix.
*
* @author Andres de la Pena {@literal }
*/
public class PrefixCondition extends SingleColumnCondition {
/** The field prefix to be matched. */
public final String value;
/**
* Constructor using the field name and the value to be matched.
*
* @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}.
* @param field the name of the field to be matched
* @param value the field prefix to be matched
*/
public PrefixCondition(Float boost, String field, String value) {
super(boost, field);
if (value == null) {
throw new IndexException("Field value required");
}
this.value = value;
}
/** {@inheritDoc} */
@Override
public Query doQuery(SingleColumnMapper mapper, Analyzer analyzer) {
if (mapper.base == String.class) {
Term term = new Term(field, value);
return new PrefixQuery(term);
} else {
throw new IndexException("Prefix queries are not supported by mapper '{}'", mapper);
}
}
/** {@inheritDoc} */
@Override
public MoreObjects.ToStringHelper toStringHelper() {
return toStringHelper(this).add("value", value);
}
}