/*******************************************************************************
 * Copyright (c) 2009, 2010 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.eclipselink.core.internal.context.java;

import org.eclipse.jpt.common.utility.internal.iterables.EmptyIterable;
import org.eclipse.jpt.jpa.core.JpaFactory;
import org.eclipse.jpt.jpa.core.context.java.DefaultJavaAttributeMappingDefinition;
import org.eclipse.jpt.jpa.core.context.java.JavaAttributeMapping;
import org.eclipse.jpt.jpa.core.context.java.JavaPersistentAttribute;
import org.eclipse.jpt.jpa.eclipselink.core.EclipseLinkMappingKeys;
import org.eclipse.jpt.jpa.eclipselink.core.internal.EclipseLinkJpaFactory;
import org.eclipse.jpt.jpa.eclipselink.core.resource.java.EclipseLinkVariableOneToOneAnnotation;

public class EclipseLinkJavaVariableOneToOneMappingDefinition
	implements DefaultJavaAttributeMappingDefinition
{
	// singleton
	private static final DefaultJavaAttributeMappingDefinition INSTANCE = new EclipseLinkJavaVariableOneToOneMappingDefinition();

	/**
	 * Return the singleton.
	 */
	public static DefaultJavaAttributeMappingDefinition instance() {
		return INSTANCE;
	}


	/**
	 * Enforce singleton usage
	 */
	private EclipseLinkJavaVariableOneToOneMappingDefinition() {
		super();
	}

	public String getKey() {
		return EclipseLinkMappingKeys.VARIABLE_ONE_TO_ONE_ATTRIBUTE_MAPPING_KEY;
	}

	public String getAnnotationName() {
		return EclipseLinkVariableOneToOneAnnotation.ANNOTATION_NAME;
	}

	public boolean isSpecified(JavaPersistentAttribute persistentAttribute) {
		return persistentAttribute.getResourcePersistentAttribute().getAnnotation(this.getAnnotationName()) != null;
	}

	public Iterable<String> getSupportingAnnotationNames() {
		return EmptyIterable.instance();
	}

	public JavaAttributeMapping buildMapping(JavaPersistentAttribute persistentAttribute, JpaFactory factory) {
		return ((EclipseLinkJpaFactory) factory).buildJavaEclipseLinkVariableOneToOneMapping(persistentAttribute);
	}

	public boolean isDefault(JavaPersistentAttribute persistentAttribute) {
		return ((JavaEclipseLinkPersistentAttribute) persistentAttribute).typeIsValidForVariableOneToOne();
	}

	@Override
	public String toString() {
		return this.getClass().getSimpleName();
	}
}