MWNullArgument.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.mappingsmodel.query.relational;

import org.eclipse.persistence.expressions.Expression;
import org.eclipse.persistence.expressions.ExpressionBuilder;
import org.eclipse.persistence.oxm.XMLDescriptor;

public class MWNullArgument extends MWArgument {

    public static XMLDescriptor buildDescriptor()
    {
        XMLDescriptor descriptor = new XMLDescriptor();
        descriptor.setJavaClass(MWNullArgument.class);
        descriptor.getInheritancePolicy().setParentClass(MWArgument.class);

        return descriptor;
    }

    private MWNullArgument() {
        super();
    }

    MWNullArgument(MWBasicExpression expression) {
        super(expression);
    }

    public String getType() {
        return null;
    }

    Expression runtimeExpression(ExpressionBuilder builder) {
        return null;
    }

    public void undoChange(String propertyName, Object oldValue, Object newValue) {

    }

    public String displayString() {
        return "";
    }

}