/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
* third-party contributors as indicated by either @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.ejb.criteria.expression;
import java.io.Serializable;
import javax.persistence.criteria.Expression;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.CriteriaQueryCompiler;
import org.hibernate.ejb.criteria.ParameterRegistry;
import org.hibernate.ejb.criteria.Renderable;
/**
* A string concatenation.
*
* @author Steve Ebersole
*/
public class ConcatExpression extends ExpressionImpl<String> implements Serializable {
private Expression<String> string1;
private Expression<String> string2;
public ConcatExpression(
CriteriaBuilderImpl criteriaBuilder,
Expression<String> expression1,
Expression<String> expression2) {
super( criteriaBuilder, String.class );
this.string1 = expression1;
this.string2 = expression2;
}
public ConcatExpression(
CriteriaBuilderImpl criteriaBuilder,
Expression<String> string1,
String string2) {
this( criteriaBuilder, string1, wrap( criteriaBuilder, string2) );
}
private static Expression<String> wrap(CriteriaBuilderImpl criteriaBuilder, String string) {
return new LiteralExpression<String>( criteriaBuilder, string );
}
public ConcatExpression(
CriteriaBuilderImpl criteriaBuilder,
String string1,
Expression<String> string2) {
this( criteriaBuilder, wrap( criteriaBuilder, string1), string2 );
}
public Expression<String> getString1() {
return string1;
}
public Expression<String> getString2() {
return string2;
}
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getString1(), registry );
Helper.possibleParameter( getString2(), registry );
}
public String render(CriteriaQueryCompiler.RenderingContext renderingContext) {
return ( (Renderable) getString1() ).render( renderingContext )
+ " || "
+ ( (Renderable) getString2() ).render( renderingContext );
}
public String renderProjection(CriteriaQueryCompiler.RenderingContext renderingContext) {
return render( renderingContext );
}
}