com.stratio.cassandra.lucene.search.condition.PrefixCondition Maven / Gradle / Ivy
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* See the NOTICE file distributed with this work for additional information
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* 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,
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*/
package com.stratio.cassandra.lucene.search.condition;
import com.google.common.base.Objects;
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}. If {@code null}, then {@link
* #DEFAULT_BOOST} is used as default.
* @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 query(SingleColumnMapper mapper, Analyzer analyzer) {
if (mapper.base == String.class) {
Term term = new Term(field, value);
Query query = new PrefixQuery(term);
query.setBoost(boost);
return query;
} else {
throw new IndexException("Prefix queries are not supported by mapper '%s' mapper", mapper);
}
}
/** {@inheritDoc} */
@Override
public String toString() {
return Objects.toStringHelper(this).add("field", field).add("value", value).toString();
}
}