Hibernate example source code file (PluralAttributeImpl.java)

This example Hibernate source code file (PluralAttributeImpl.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

builder, builder, c, c, class, collection, collectionattributeimpl, collectiontype, e, e, io, listattributeimpl, pluralattributeimpl, pluralattributeimpl, reflection, type, util

The Hibernate PluralAttributeImpl.java source code

/*
 * Copyright (c) 2009, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.metamodel;
import java.io.Serializable;
import java.lang.reflect.Member;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.metamodel.CollectionAttribute;
import javax.persistence.metamodel.ListAttribute;
import javax.persistence.metamodel.MapAttribute;
import javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.SetAttribute;
import javax.persistence.metamodel.Type;
import org.hibernate.mapping.Property;

/**
 * @author Emmanuel Bernard
 * @author Steve Ebersole
 */
public abstract class PluralAttributeImpl<X, C, E>
		extends AbstractAttribute<X,C>
		implements PluralAttribute<X, C, E>, Serializable {

	private final Type<E> elementType;

	private PluralAttributeImpl(Builder<X,C,E,?> builder) {
		super(
				builder.property.getName(),
				builder.collectionClass,
				builder.type,
				builder.member,
				builder.persistentAttributeType
		);
		this.elementType = builder.attributeType;
	}

	public static class Builder<X, C, E, K> {
		private final Type<E> attributeType;
		private final AbstractManagedType<X> type;
		private Member member;
		private PersistentAttributeType persistentAttributeType;
		private Property property;
		private Class<C> collectionClass;
		private Type<K> keyType;


		private Builder(AbstractManagedType<X> ownerType, Type attrType, Class collectionClass, Type keyType) {
			this.type = ownerType;
			this.attributeType = attrType;
			this.collectionClass = collectionClass;
			this.keyType = keyType;
		}

		public Builder<X,C,E,K> member(Member member) {
			this.member = member;
			return this;
		}

		public Builder<X,C,E,K> property(Property property) {
			this.property = property;
			return this;
		}

		public Builder<X,C,E,K> persistentAttributeType(PersistentAttributeType attrType) {
			this.persistentAttributeType = attrType;
			return this;
		}

		@SuppressWarnings( "unchecked" )
		public <K> PluralAttributeImpl build() {
			//apply strict spec rules first
			if ( Map.class.equals( collectionClass ) ) {
				final Builder<X,Map builder = (Builder,E,K>) this;
				return ( PluralAttributeImpl<X, C, E> ) new MapAttributeImpl(
						builder
				);
			}
			else if ( Set.class.equals( collectionClass ) ) {
				final Builder<X,Set builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new SetAttributeImpl(
						builder
				);
			}
			else if ( List.class.equals( collectionClass ) ) {
				final Builder<X, List builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new ListAttributeImpl(
						builder
				);
			}
			else if ( Collection.class.equals( collectionClass ) ) {
				final Builder<X, Collection builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new CollectionAttributeImpl(
						builder
				);
			}

			//apply loose rules
			if ( Map.class.isAssignableFrom( collectionClass ) ) {
				final Builder<X,Map builder = (Builder,E,K>) this;
				return ( PluralAttributeImpl<X, C, E> ) new MapAttributeImpl(
						builder
				);
			}
			else if ( Set.class.isAssignableFrom( collectionClass ) ) {
				final Builder<X,Set builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new SetAttributeImpl(
						builder
				);
			}
			else if ( List.class.isAssignableFrom( collectionClass ) ) {
				final Builder<X, List builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new ListAttributeImpl(
						builder
				);
			}
			else if ( Collection.class.isAssignableFrom( collectionClass ) ) {
				final Builder<X, Collection builder = (Builder, E,?>) this;
				return ( PluralAttributeImpl<X, C, E> ) new CollectionAttributeImpl(
						builder
				);
			}
			throw new UnsupportedOperationException( "Unkown collection: " + collectionClass );
		}
	}

	public static <X,C,E,K> Builder create(
			AbstractManagedType<X> ownerType,
			Type<E> attrType,
			Class<C> collectionClass,
			Type<K> keyType) {
		return new Builder<X,C,E,K>(ownerType, attrType, collectionClass, keyType);
	}

	/**
	 * {@inheritDoc}
	 */
	public Type<E> getElementType() {
		return elementType;
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean isAssociation() {
		return true;
	}

	/**
	 * {@inheritDoc}
	 */
	public boolean isCollection() {
		return true;
	}

	/**
	 * {@inheritDoc}
	 */
	public BindableType getBindableType() {
		return BindableType.PLURAL_ATTRIBUTE;
	}

	/**
	 * {@inheritDoc}
	 */
	public Class<E> getBindableJavaType() {
		return elementType.getJavaType();
	}

	static class SetAttributeImpl<X,E> extends PluralAttributeImpl,E> implements SetAttribute {
		SetAttributeImpl(Builder<X,Set xceBuilder) {
			super( xceBuilder );
		}

		/**
		 * {@inheritDoc}
		 */
		public CollectionType getCollectionType() {
			return CollectionType.SET;
		}
	}

	static class CollectionAttributeImpl<X,E> extends PluralAttributeImpl,E> implements CollectionAttribute {
		CollectionAttributeImpl(Builder<X, Collection xceBuilder) {
			super( xceBuilder );
		}

		/**
		 * {@inheritDoc}
		 */
		public CollectionType getCollectionType() {
			return CollectionType.COLLECTION;
		}
	}

	static class ListAttributeImpl<X,E> extends PluralAttributeImpl,E> implements ListAttribute {
		ListAttributeImpl(Builder<X,List xceBuilder) {
			super( xceBuilder );
		}

		/**
		 * {@inheritDoc}
		 */
		public CollectionType getCollectionType() {
			return CollectionType.LIST;
		}
	}

	static class MapAttributeImpl<X,K,V> extends PluralAttributeImpl,V> implements MapAttribute {
		private final Type<K> keyType;

		MapAttributeImpl(Builder<X,Map xceBuilder) {
			super( xceBuilder );
			this.keyType = xceBuilder.keyType;
		}

		/**
		 * {@inheritDoc}
		 */
		public CollectionType getCollectionType() {
			return CollectionType.MAP;
		}

		/**
		 * {@inheritDoc}
		 */
		public Class<K> getKeyJavaType() {
			return keyType.getJavaType();
		}

		/**
		 * {@inheritDoc}
		 */
		public Type<K> getKeyType() {
			return keyType;
		}
	}
}