Hibernate example source code file (CompoundSelectionImpl.java)

This example Hibernate source code file (CompoundSelectionImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

class, compoundselectionimpl, criteriabuilderimpl, io, list, list, override, override, renderable, selection, selection, string, string, stringbuilder, tupleelementimplementor, util

The Hibernate CompoundSelectionImpl.java source code

/*
 * 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 java.util.ArrayList;
import java.util.List;
import javax.persistence.Tuple;
import javax.persistence.criteria.CompoundSelection;
import javax.persistence.criteria.Selection;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.CriteriaQueryCompiler;
import org.hibernate.ejb.criteria.ParameterRegistry;
import org.hibernate.ejb.criteria.Renderable;
import org.hibernate.ejb.criteria.TupleElementImplementor;
import org.hibernate.ejb.criteria.ValueHandlerFactory;

/**
 * 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();
		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(CriteriaQueryCompiler.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();
	}

	public String renderProjection(CriteriaQueryCompiler.RenderingContext renderingContext) {
		return render( renderingContext );
	}
}