/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat, Inc. and/or its affiliates or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat, Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY 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
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.search.query.dsl.impl;
import java.util.ArrayList;
import java.util.List;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.hibernate.annotations.common.AssertionFailure;
import org.hibernate.search.query.dsl.BooleanJunction;
import org.hibernate.search.query.dsl.MustJunction;
/**
* @author Emmanuel Bernard
*/
class BooleanQueryBuilder implements MustJunction {
private final List<BooleanClause> clauses;
private final QueryCustomizer queryCustomizer;
BooleanQueryBuilder() {
clauses = new ArrayList<BooleanClause>(5);
queryCustomizer = new QueryCustomizer();
}
public BooleanJunction not() {
final int lastIndex = clauses.size() -1;
final BooleanClause last = clauses.get(lastIndex);
if ( ! last.getOccur().equals( BooleanClause.Occur.MUST ) ) {
throw new AssertionFailure( "Cannot negate class: " + last.getOccur() );
}
clauses.set( lastIndex, new BooleanClause( last.getQuery(), BooleanClause.Occur.MUST_NOT ) );
return this;
}
public BooleanJunction should(Query query) {
clauses.add( new BooleanClause( query, BooleanClause.Occur.SHOULD ) );
return this;
}
public MustJunction must(Query query) {
clauses.add( new BooleanClause( query, BooleanClause.Occur.MUST ) );
return this;
}
public MustJunction boostedTo(float boost) {
queryCustomizer.boostedTo( boost );
return this;
}
public MustJunction withConstantScore() {
queryCustomizer.withConstantScore();
return this;
}
public MustJunction filteredBy(Filter filter) {
queryCustomizer.filteredBy(filter);
return this;
}
public Query createQuery() {
final int nbrOfClauses = clauses.size();
if ( nbrOfClauses == 0) {
throw new AssertionFailure( "Cannot create an empty boolean query" );
}
else if ( nbrOfClauses == 1 ) {
final BooleanClause uniqueClause = clauses.get( 0 );
if ( uniqueClause.getOccur().equals( BooleanClause.Occur.MUST_NOT ) ) {
//FIXME We have two choices here, raise an exception or combine with an All query. #2 is done atm.
//TODO which normfield to use and how to pass it?
should( new MatchAllDocsQuery() );
}
else {
//optimize
return queryCustomizer.setWrappedQuery( uniqueClause.getQuery() ).createQuery();
}
}
BooleanQuery query = new BooleanQuery( );
for (BooleanClause clause : clauses) {
query.add( clause );
}
return queryCustomizer.setWrappedQuery( query ).createQuery();
}
}