org.hibernate.query.criteria.internal.expression.ConcatExpression Maven / Gradle / Ivy

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Hibernate's core ORM functionality

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.query.criteria.internal.expression;

import java.io.Serializable;
import javax.persistence.criteria.Expression;

import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.Renderable;
import org.hibernate.query.criteria.internal.compile.RenderingContext;

/**
 * A string concatenation.
 *
 * @author Steve Ebersole
 */
public class ConcatExpression extends ExpressionImpl implements Serializable {
	private Expression string1;
	private Expression string2;

	public ConcatExpression(
			CriteriaBuilderImpl criteriaBuilder,
			Expression expression1,
			Expression expression2) {
		super( criteriaBuilder, String.class );
		this.string1 = expression1;
		this.string2 = expression2;
	}

	public ConcatExpression(
			CriteriaBuilderImpl criteriaBuilder,
			Expression string1, 
			String string2) {
		this( criteriaBuilder, string1, wrap( criteriaBuilder, string2) );
	}

	private static Expression wrap(CriteriaBuilderImpl criteriaBuilder, String string) {
		return new LiteralExpression( criteriaBuilder, string );
	}

	public ConcatExpression(
			CriteriaBuilderImpl criteriaBuilder,
			String string1,
			Expression string2) {
		this( criteriaBuilder, wrap( criteriaBuilder, string1), string2 );
	}

	public Expression getString1() {
		return string1;
	}

	public Expression getString2() {
		return string2;
	}

	public void registerParameters(ParameterRegistry registry) {
		Helper.possibleParameter( getString1(), registry );
		Helper.possibleParameter( getString2(), registry );
	}

	public String render(RenderingContext renderingContext) {
		return  '(' + ((Renderable) getString1() ).render( renderingContext )
				+ " || "
				+ ( (Renderable) getString2() ).render( renderingContext ) + ')' ;
	}
}