Hibernate example source code file (CollectionPropertyMapping.java)

This example Hibernate source code file (CollectionPropertyMapping.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

collectionpropertymapping, collectionpropertymapping, propertymapping, queryablecollection, queryexception, queryexception, references, sql, string, string, type, unsupportedoperationexception, unsupportedoperationexception

The Hibernate CollectionPropertyMapping.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @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.persister.collection;

import org.hibernate.QueryException;
import org.hibernate.persister.entity.PropertyMapping;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;

/**
 * @author Gavin King
 */
public class CollectionPropertyMapping implements PropertyMapping {

	private final QueryableCollection memberPersister;

	public CollectionPropertyMapping(QueryableCollection memberPersister) {
		this.memberPersister = memberPersister;
	}

	public Type toType(String propertyName) throws QueryException {
		if ( propertyName.equals(CollectionPropertyNames.COLLECTION_ELEMENTS) ) {
			return memberPersister.getElementType();
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_INDICES) ) {
			if ( !memberPersister.hasIndex() ) throw new QueryException("unindexed collection before indices()");
			return memberPersister.getIndexType();
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_SIZE) ) {
			return StandardBasicTypes.INTEGER;
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MAX_INDEX) ) {
			return memberPersister.getIndexType();
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MIN_INDEX) ) {
			return memberPersister.getIndexType();
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MAX_ELEMENT) ) {
			return memberPersister.getElementType();
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MIN_ELEMENT) ) {
			return memberPersister.getElementType();
		}
		else {
			//return memberPersister.getPropertyType(propertyName);
			throw new QueryException("illegal syntax near collection: " + propertyName);
		}
	}

	public String[] toColumns(String alias, String propertyName) throws QueryException {
		if ( propertyName.equals(CollectionPropertyNames.COLLECTION_ELEMENTS) ) {
			return memberPersister.getElementColumnNames(alias);
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_INDICES) ) {
			if ( !memberPersister.hasIndex() ) throw new QueryException("unindexed collection in indices()");
			return memberPersister.getIndexColumnNames(alias);
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_SIZE) ) {
			String[] cols = memberPersister.getKeyColumnNames();
			return new String[] { "count(" + alias + '.' + cols[0] + ')' };
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MAX_INDEX) ) {
			if ( !memberPersister.hasIndex() ) throw new QueryException("unindexed collection in maxIndex()");
			String[] cols = memberPersister.getIndexColumnNames(alias);
			if ( cols.length!=1 ) throw new QueryException("composite collection index in maxIndex()");
			return new String[] { "max(" + cols[0] + ')' };
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MIN_INDEX) ) {
			if ( !memberPersister.hasIndex() ) throw new QueryException("unindexed collection in minIndex()");
			String[] cols = memberPersister.getIndexColumnNames(alias);
			if ( cols.length!=1 ) throw new QueryException("composite collection index in minIndex()");
			return new String[] { "min(" + cols[0] + ')' };
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MAX_ELEMENT) ) {
			String[] cols = memberPersister.getElementColumnNames(alias);
			if ( cols.length!=1 ) throw new QueryException("composite collection element in maxElement()");
			return new String[] { "max(" + cols[0] + ')' };
		}
		else if ( propertyName.equals(CollectionPropertyNames.COLLECTION_MIN_ELEMENT) ) {
			String[] cols = memberPersister.getElementColumnNames(alias);
			if ( cols.length!=1 ) throw new QueryException("composite collection element in minElement()");
			return new String[] { "min(" + cols[0] + ')' };
		}
		else {
			//return memberPersister.toColumns(alias, propertyName);
			throw new QueryException("illegal syntax near collection: " + propertyName);
		}
	}

	/**
	 * Given a property path, return the corresponding column name(s).
	 */
	public String[] toColumns(String propertyName) throws QueryException, UnsupportedOperationException {
		throw new UnsupportedOperationException( "References to collections must be define a SQL alias" );
	}

	public Type getType() {
		//return memberPersister.getType();
		return memberPersister.getCollectionType();
	}

}