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CastFunction.java
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CastFunction.java
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/*
* 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.function;
import java.io.Serializable;
import org.hibernate.ejb.criteria.ParameterRegistry;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.CriteriaQueryCompiler;
import org.hibernate.ejb.criteria.expression.ExpressionImpl;
/**
* Models a <tt>CAST</tt> function.
*
* @param <T> The cast result type.
* @param <Y> The type of the expression to be cast.
*
* @author Steve Ebersole
*/
public class CastFunction<T,Y>
extends BasicFunctionExpression<T>
implements FunctionExpression<T>, Serializable {
public static final String CAST_NAME = "cast";
private final ExpressionImpl<Y> castSource;
public CastFunction(
CriteriaBuilderImpl criteriaBuilder,
Class<T> javaType,
ExpressionImpl<Y> castSource) {
super( criteriaBuilder, javaType, CAST_NAME );
this.castSource = castSource;
}
public ExpressionImpl<Y> getCastSource() {
return castSource;
}
@Override
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getCastSource(), registry );
}
@Override
public String render(CriteriaQueryCompiler.RenderingContext renderingContext) {
return CAST_NAME + '(' +
castSource.render( renderingContext ) +
" as " +
renderingContext.getCastType( getJavaType() ) +
')';
}
}