/*
 * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.query.criteria.internal.expression;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Tuple;
import javax.persistence.criteria.CompoundSelection;
import javax.persistence.criteria.Selection;

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.TupleElementImplementor;
import org.hibernate.query.criteria.internal.ValueHandlerFactory;
import org.hibernate.query.criteria.internal.compile.RenderingContext;

The Hibernate implementation of the JPA CompoundSelection contract.
Author:Steve Ebersole
/** * The Hibernate implementation of the JPA {@link CompoundSelection} * contract. * * @author Steve Ebersole */
public class CompoundSelectionImpl<X> extends SelectionImpl<X> implements CompoundSelection<X>, Renderable, Serializable { private final boolean isConstructor; private List<Selection<?>> selectionItems; public CompoundSelectionImpl( CriteriaBuilderImpl criteriaBuilder, Class<X> javaType, List<Selection<?>> selectionItems) { super( criteriaBuilder, javaType ); this.isConstructor = !javaType.isArray() && !Tuple.class.isAssignableFrom( javaType ); this.selectionItems = selectionItems; } @Override public boolean isCompoundSelection() { return true; } @Override public List<Selection<?>> getCompoundSelectionItems() { return selectionItems; } @Override public List<ValueHandlerFactory.ValueHandler> getValueHandlers() { if ( isConstructor ) { return null; } boolean foundHandlers = false; ArrayList<ValueHandlerFactory.ValueHandler> valueHandlers = new ArrayList<ValueHandlerFactory.ValueHandler>(); for ( Selection selection : getCompoundSelectionItems() ) { ValueHandlerFactory.ValueHandler valueHandler = ( (TupleElementImplementor) selection ).getValueHandler(); valueHandlers.add( valueHandler ); foundHandlers = foundHandlers || valueHandler != null; } return foundHandlers ? null : valueHandlers; } public void registerParameters(ParameterRegistry registry) { for ( Selection selectionItem : getCompoundSelectionItems() ) { Helper.possibleParameter(selectionItem, registry); } } public String render(RenderingContext renderingContext) { StringBuilder buff = new StringBuilder(); if ( isConstructor ) { buff.append( "new " ).append( getJavaType().getName() ).append( '(' ); } String sep = ""; for ( Selection selection : selectionItems ) { buff.append( sep ) .append( ( (Renderable) selection ).renderProjection( renderingContext ) ); sep = ", "; } if ( isConstructor ) { buff.append( ')' ); } return buff.toString(); } }