LuceneLikePredicate.java

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
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 * Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors
 * as indicated by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
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 *
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 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License,
 * v.2.1 along with this distribution; if not, write to the Free Software
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 */
package org.hibernate.hql.lucene.internal.builder.predicate;

import java.util.regex.Pattern;

import org.apache.lucene.search.Query;
import org.hibernate.hql.ast.spi.predicate.LikePredicate;
import org.hibernate.search.bridge.FieldBridge;
import org.hibernate.search.query.dsl.QueryBuilder;

/**
 * Lucene-based {@code LIKE} predicate.
 *
 * @author Gunnar Morling
 */
public class LuceneLikePredicate extends LikePredicate<Query> {

	private static final String LUCENE_SINGLE_CHARACTER_WILDCARD = "?";
	private static final String LUCENE_MULTIPLE_CHARACTERS_WILDCARD = "*";

	private static final Pattern MULTIPLE_CHARACTERS_WILDCARD_PATTERN = Pattern.compile( "%" );
	private static final Pattern SINGLE_CHARACTER_WILDCARD_PATTERN = Pattern.compile( "_" );

	private final MatchingContextSupport matchingContextSupport;

	public LuceneLikePredicate(QueryBuilder builder, FieldBridge fieldBridge, String propertyName, String patternValue) {
		super( propertyName, patternValue, null );
		this.matchingContextSupport = new MatchingContextSupport( builder, fieldBridge, propertyName );
	}

	@Override
	public Query getQuery() {
		String patternValue = MULTIPLE_CHARACTERS_WILDCARD_PATTERN.matcher( this.patternValue ).replaceAll( LUCENE_MULTIPLE_CHARACTERS_WILDCARD );
		patternValue = SINGLE_CHARACTER_WILDCARD_PATTERN.matcher( patternValue ).replaceAll( LUCENE_SINGLE_CHARACTER_WILDCARD );

		return matchingContextSupport.wildcardTermMatchingContext().matching( patternValue ).createQuery();
	}
}