jpa/org.eclipse.persistence.jpa/src/main/java/org/eclipse/persistence/internal/jpa/metadata/tables/CollectionTableMetadata.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 file
//     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)
//     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.tables;

import java.util.ArrayList;
import java.util.List;

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.columns.PrimaryKeyJoinColumnMetadata;
import org.eclipse.persistence.internal.jpa.metadata.xml.XMLEntityMappings;
import org.eclipse.persistence.internal.jpa.metadata.MetadataLogger;

/**
 * INTERNAL:
 * Object to hold onto a collection table metadata in an EclipseLink
 * database table.
 *
 * 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.
 *
 * @author Guy Pelletier
 * @since TopLink 11g
 */
public class CollectionTableMetadata extends RelationalTableMetadata {
    private List<PrimaryKeyJoinColumnMetadata> m_primaryKeyJoinColumns = new ArrayList<PrimaryKeyJoinColumnMetadata>();

    /**
     * INTERNAL:
     * Used for XML loading.
     */
    public CollectionTableMetadata() {
        super("<collection-table>");
    }

    /**
     * INTERNAL:
     * Used for defaulting.
     */
    public CollectionTableMetadata(MetadataAccessor accessor) {
        super(null, accessor);
    }

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

        if (collectionTable != null) {
            for (Object primaryKeyJoinColumn : collectionTable.getAttributeArray("primaryKeyJoinColumns")) {
                m_primaryKeyJoinColumns.add(new PrimaryKeyJoinColumnMetadata((MetadataAnnotation) primaryKeyJoinColumn, accessor));
            }
        }
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean equals(Object objectToCompare) {
        if (super.equals(objectToCompare)&& objectToCompare instanceof CollectionTableMetadata) {
            CollectionTableMetadata collectionTable = (CollectionTableMetadata) objectToCompare;

            return valuesMatch(m_primaryKeyJoinColumns, collectionTable.getPrimaryKeyJoinColumns());
        }

        return false;
    }

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

    /**
     * INTERNAL:
     */
    @Override
    public String getCatalogContext() {
        return MetadataLogger.COLLECTION_TABLE_CATALOG;
    }

    /**
     * INTERNAL:
     */
    @Override
    public String getNameContext() {
        return MetadataLogger.COLLECTION_TABLE_NAME;
    }

    /**
     * INTERNAL:
     */
    public List<PrimaryKeyJoinColumnMetadata> getPrimaryKeyJoinColumns() {
        return m_primaryKeyJoinColumns;
    }

    /**
     * INTERNAL:
     */
    @Override
    public String getSchemaContext() {
        return MetadataLogger.COLLECTION_TABLE_SCHEMA;
    }

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

        // Initialize lists of ORMetadata objects.
        initXMLObjects(m_primaryKeyJoinColumns, accessibleObject);
    }

    /**
     * INTERNAL:
     */
    public void setPrimaryKeyJoinColumns(List<PrimaryKeyJoinColumnMetadata> primaryKeyJoinColumns) {
        m_primaryKeyJoinColumns = primaryKeyJoinColumns;
    }
}