jpa/org.eclipse.persistence.jpa/src/main/java/org/eclipse/persistence/internal/jpa/metadata/copypolicy/CustomCopyPolicyMetadata.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:
//     tware - March 28/2008 - 1.0M7 - Initial implementation
//     05/16/2008-1.0M8 Guy Pelletier
//       - 218084: Implement metadata merging functionality between mapping files
//     04/27/2010-2.1 Guy Pelletier
//       - 309856: MappedSuperclasses from XML are not being initialized properly
//     03/24/2011-2.3 Guy Pelletier
//       - 337323: Multi-tenant with shared schema support (part 1)
package org.eclipse.persistence.internal.jpa.metadata.copypolicy;

import org.eclipse.persistence.descriptors.copying.CopyPolicy;
import org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor;

import org.eclipse.persistence.internal.jpa.metadata.accessors.MetadataAccessor;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAccessibleObject;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotation;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataClass;

import org.eclipse.persistence.internal.jpa.metadata.xml.XMLEntityMappings;

/**
 * Used to store information about CopyPolicy as it is read from XML or
 * annotations
 *
 * Key notes:
 * - any metadata mapped from XML to this class must be compared in the
 *   equals method.
 * - when loading from annotations, the constructor accepts the metadata
 *   accessor this metadata was loaded from. Used it to look up any
 *   'companion' annotation needed for processing.
 * - methods should be preserved in alphabetical order.
 *
 * @see org.eclipse.persistence.annotations.CopyPolicy
 * @author tware
 */
public class CustomCopyPolicyMetadata extends CopyPolicyMetadata {
    private String copyPolicyClassName;
    private MetadataClass copyPolicyClass;

    /**
     * INTERNAL:
     * Used for XML loading.
     */
    public CustomCopyPolicyMetadata() {
        super("<copy-policy");
    }

    /**
     * INTERNAL:
     * Used for annotation loading.
     */
    public CustomCopyPolicyMetadata(MetadataAnnotation copyPolicy, MetadataAccessor accessor) {
        super(copyPolicy, accessor);

        this.copyPolicyClass = getMetadataClass(copyPolicy.getAttributeString("value"));
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean equals(Object objectToCompare) {
        if (super.equals(objectToCompare) && objectToCompare instanceof CustomCopyPolicyMetadata) {
            CustomCopyPolicyMetadata customCopyPoliy = (CustomCopyPolicyMetadata) objectToCompare;
            return valuesMatch(copyPolicyClassName, customCopyPoliy.getCopyPolicyClassName());
        }

        return false;
    }

    @Override
    public int hashCode() {
        return copyPolicyClassName != null ? copyPolicyClassName.hashCode() : 0;
    }

    /**
     * INTERNAL:
     */
    @Override
    public CopyPolicy getCopyPolicy(){
        assert(false); // we should never get here
        return null;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public String getCopyPolicyClassName(){
        return copyPolicyClassName;
    }

    /**
     * INTERNAL:
     */
    @Override
    public void initXMLObject(MetadataAccessibleObject accessibleObject, XMLEntityMappings entityMappings) {
        super.initXMLObject(accessibleObject, entityMappings);

        copyPolicyClass = initXMLClassName(copyPolicyClassName);
    }

    /**
     * INTERNAL:
     */
    @Override
    public void process(MetadataDescriptor descriptor) {
        descriptor.setHasCopyPolicy();
        descriptor.getClassDescriptor().setCopyPolicyClassName(copyPolicyClass.getName());
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setCopyPolicyClassName(String copyPolicyClassName) {
        this.copyPolicyClassName = copyPolicyClassName;
    }
}