~ubuntu-branches/ubuntu/wily/libhibernate3-java/wily-proposed

//$Id: ElementPropertyMapping.java 6179 2005-03-23 15:41:48Z steveebersole $

package org.hibernate.persister.collection;

 

import org.hibernate.MappingException;

 

import org.hibernate.QueryException;

 

import org.hibernate.persister.entity.PropertyMapping;

 

import org.hibernate.type.Type;

 

import org.hibernate.util.StringHelper;

 

/**

 * @author Gavin King

 */

public class ElementPropertyMapping implements PropertyMapping {

 

        private final String[] elementColumns;

        private final Type type;

 

        public ElementPropertyMapping(String[] elementColumns, Type type)

        throws MappingException {

                this.elementColumns = elementColumns;

                this.type = type;

        }

 

        public Type toType(String propertyName) throws QueryException {

                if ( propertyName==null || "id".equals(propertyName) ) {

                        return type;

                }

                else {

                        throw new QueryException("cannot dereference scalar collection element: " + propertyName);

                }

        }

 

        public String[] toColumns(String alias, String propertyName) throws QueryException {

                if (propertyName==null || "id".equals(propertyName) ) {

                        return StringHelper.qualify(alias, elementColumns);

                }

                else {

                        throw new QueryException("cannot dereference scalar collection element: " + 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 type;

        }

 

}