jpa/org.eclipse.persistence.jpa/src/main/java/org/eclipse/persistence/internal/jpa/metadata/accessors/mappings/ManyToOneAccessor.java

/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
//     05/16/2008-1.0M8 Guy Pelletier
//       - 218084: Implement metadata merging functionality between mapping files
//     02/06/2009-2.0 Guy Pelletier
//       - 248293: JPA 2.0 Element Collections (part 2)
//     03/27/2009-2.0 Guy Pelletier
//       - 241413: JPA 2.0 Add EclipseLink support for Map type attributes
//     04/24/2009-2.0 Guy Pelletier
//       - 270011: JPA 2.0 MappedById support
//     11/02/2009-2.0 Michael O'Brien
//       - 266912: JPA 2.0 Metamodel support for m:1 as m:m in DI 96
//     04/27/2010-2.1 Guy Pelletier
//       - 309856: MappedSuperclasses from XML are not being initialized properly
//     06/14/2010-2.2 Guy Pelletier
//       - 264417: Table generation is incorrect for JoinTables in AssociationOverrides
//     03/24/2011-2.3 Guy Pelletier
//       - 337323: Multi-tenant with shared schema support (part 1)
//     11/19/2012-2.5 Guy Pelletier
//       - 389090: JPA 2.1 DDL Generation Support (foreign key metadata support)
package org.eclipse.persistence.internal.jpa.metadata.accessors.mappings;

import org.eclipse.persistence.internal.jpa.metadata.MetadataLogger;

import org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotatedElement;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotation;

import org.eclipse.persistence.mappings.ManyToOneMapping;
import org.eclipse.persistence.mappings.ObjectReferenceMapping;

/**
 * INTERNAL:
 * A many to one relationship accessor.
 *
 * Key notes:
 * - any metadata mapped from XML to this class must be compared in the
 *   equals method.
 * - any metadata mapped from XML to this class must be handled in the merge
 *   method. (merging is done at the accessor/mapping level)
 * - any metadata mapped from XML to this class must be initialized in the
 *   initXMLObject  method.
 * - methods should be preserved in alphabetical order.
 *
 * @author Guy Pelletier
 * @since TopLink EJB 3.0 Reference Implementation
 */
public class ManyToOneAccessor extends ObjectAccessor {
    /**
     * INTERNAL:
     */
    public ManyToOneAccessor() {
        super("<many-to-one>");
    }

    /**
     * INTERNAL:
     */
    public ManyToOneAccessor(MetadataAnnotation manyToOne, MetadataAnnotatedElement annotatedElement, ClassAccessor classAccessor) {
        super(manyToOne, annotatedElement, classAccessor);
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean equals(Object objectToCompare) {
        return super.equals(objectToCompare) && objectToCompare instanceof ManyToOneAccessor;
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

    /**
     * INTERNAL:
     * Return the logging context for this accessor.
     */
    @Override
    protected String getLoggingContext() {
        return MetadataLogger.MANY_TO_ONE_MAPPING_REFERENCE_CLASS;
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean isManyToOne() {
        return true;
    }

    /**
     * INTERNAL:
     * A PrivateOwned setting on a ManyToOne is ignored. A log warning is
     * issued.
     */
    @Override
    public boolean isPrivateOwned() {
        if (super.isPrivateOwned()) {
            getLogger().logWarningMessage(MetadataLogger.IGNORE_PRIVATE_OWNED_ANNOTATION, this);
        }

        return false;
    }

    /**
     * INTERNAL:
     * Process a many to one setting into an EclipseLink OneToOneMapping.
     */
    @Override
    public void process() {
        super.process();

        // Initialize our mapping now with what we found.
        ObjectReferenceMapping mapping = initManyToOneMapping();

        if (mapping instanceof ManyToOneMapping) {
            // Process the owning keys for this mapping.
            processOwningMappingKeys((ManyToOneMapping) mapping);
        } else {
            processForeignKeyRelationship(mapping);
        }
    }
}