StructMetadata.java

/*******************************************************************************
 * Copyright (c) 2011, 2015 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 v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial implementation
 *     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.structures;

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

import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor;
import org.eclipse.persistence.internal.jpa.metadata.ORMetadata;
import org.eclipse.persistence.internal.jpa.metadata.accessors.MetadataAccessor;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotation;
import org.eclipse.persistence.mappings.structures.ObjectRelationalDataTypeDescriptor;

/**
 * Defines the metadata for the @Struct annotation for mapping
 * ObjectRelationshipDataTypeDescriptor.
 *
 * 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 initialized in the
 *   initXMLObject 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 James Sutherland
 * @since EclipseLink 2.3
 */
public class StructMetadata extends ORMetadata {
    private String name;
    private List<String> fields = new ArrayList<String>();

    /**
     * INTERNAL:
     * Used for XML loading.
     */
    public StructMetadata() {
        super("<struct>");
    }

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

        this.name = struct.getAttributeString("name");

        for (Object field : struct.getAttributeArray("fields")) {
            this.fields.add((String)field);
        }
    }

    /**
     * INTERNAL:
     * Used for xml merging.
     */
    @Override
    public boolean equals(Object objectToCompare) {
        if (objectToCompare instanceof StructMetadata) {
            StructMetadata struct = (StructMetadata) objectToCompare;
            if (! valuesMatch(this.fields, struct.getFields())) {
                return false;
            }
            return valuesMatch(this.name, ((StructMetadata) objectToCompare).getName());
        }

        return false;
    }

    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (fields != null ? fields.hashCode() : 0);
        return result;
    }

    /**
     * INTERNAL:
     * Switch the descriptor to the correct type and set the structure name and
     * properties.
     */
    public void process(MetadataDescriptor descriptor) {
        ClassDescriptor oldDesriptor = descriptor.getClassDescriptor();
        ObjectRelationalDataTypeDescriptor newDescriptor = new ObjectRelationalDataTypeDescriptor();
        newDescriptor.setJavaClassName(oldDesriptor.getJavaClassName());
        newDescriptor.setStructureName(getName());
        for (String field : this.fields) {
            newDescriptor.addFieldOrdering(field);
        }
        newDescriptor.setAlias("");
        // This is the default, set it in case no existence-checking is set.
        newDescriptor.getQueryManager().checkDatabaseForDoesExist();
        if (oldDesriptor.isAggregateDescriptor()) {
            newDescriptor.descriptorIsAggregate();
        }
        descriptor.setDescriptor(newDescriptor);
        // Also need to switch the descriptor in the project.
        descriptor.getProject().getProject().getOrderedDescriptors().remove(oldDesriptor);
        descriptor.getProject().getProject().getOrderedDescriptors().add(newDescriptor);
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public List<String> getFields() {
        return fields;
    }

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

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setFields(List<String> fields) {
        this.fields = fields;
    }

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