//$Id: PropertyExpression.java 5685 2005-02-12 07:19:50Z steveebersole $
package org.hibernate.criterion;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.engine.TypedValue;
import org.hibernate.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.getColumnsUsingProjection(criteria, propertyName);
String[] ycols = criteriaQuery.getColumnsUsingProjection(criteria, otherPropertyName);
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;
}
}
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