/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.criterion;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.TypedValue;
import org.hibernate.internal.util.StringHelper;
/**
* superclass for comparisons between two properties (with SQL binary operators)
* @author Gavin King
*/
public class PropertyExpression implements Criterion {
private final String propertyName;
private final String otherPropertyName;
private final String op;
private static final TypedValue[] NO_TYPED_VALUES = new TypedValue[0];
protected PropertyExpression(String propertyName, String otherPropertyName, String op) {
this.propertyName = propertyName;
this.otherPropertyName = otherPropertyName;
this.op = op;
}
public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
String[] xcols = criteriaQuery.findColumns(propertyName, criteria);
String[] ycols = criteriaQuery.findColumns(otherPropertyName, criteria);
String result = StringHelper.join(
" and ",
StringHelper.add( xcols, getOp(), ycols )
);
if (xcols.length>1) result = '(' + result + ')';
return result;
//TODO: get SQL rendering out of this package!
}
public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
return NO_TYPED_VALUES;
}
public String toString() {
return propertyName + getOp() + otherPropertyName;
}
public String getOp() {
return op;
}
}