OneToManyTableReferencePanel.java

/*******************************************************************************
 * Copyright (c) 1998, 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 API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.mappingsplugin.ui.mapping.relational;

import java.util.Iterator;

import org.eclipse.persistence.tools.workbench.framework.context.WorkbenchContextHolder;
import org.eclipse.persistence.tools.workbench.mappingsmodel.db.MWTable;
import org.eclipse.persistence.tools.workbench.mappingsmodel.descriptor.relational.MWRelationalDescriptor;
import org.eclipse.persistence.tools.workbench.mappingsmodel.mapping.relational.MWOneToManyMapping;
import org.eclipse.persistence.tools.workbench.uitools.app.PropertyValueModel;


/**
 * this is the panel used to pick (and/or build) the reference from the
 * reference descriptor's table(s) back to the mapping's "parent" descriptor
 */
final class OneToManyTableReferencePanel
    extends AbstractTableReferencePanel
{

    public OneToManyTableReferencePanel(PropertyValueModel subjectHolder, WorkbenchContextHolder contextHolder) {
        super(subjectHolder, contextHolder);
    }

    /**
     * the reference source is one of the "reference" descriptor's tables
     */
    protected MWTable defaultNewReferenceSourceTable() {
        MWRelationalDescriptor descriptor = (MWRelationalDescriptor) this.mapping().getReferenceDescriptor();
        if (descriptor == null) {
            return null;
        }
        Iterator candidateTables = descriptor.candidateTables();
        return candidateTables.hasNext() ? (MWTable) candidateTables.next() : null;
    }

    /**
     * the reference target is one of the "parent" descriptor's tables
     */
    protected MWTable defaultNewReferenceTargetTable() {
        Iterator candidateTables = this.mapping().getParentRelationalDescriptor().candidateTables();
        return candidateTables.hasNext() ? (MWTable) candidateTables.next() : null;
    }

    private MWOneToManyMapping mapping() {
        return (MWOneToManyMapping) this.subject();
    }

}