/*******************************************************************************
 *
 * Copyright (c) 2011 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *
 *    Anton Kozak
 *
 *******************************************************************************/
package org.eclipse.hudson.model.project.property;

import hudson.scm.NullSCM;
import hudson.scm.SCM;
import org.eclipse.hudson.api.model.ICascadingJob;

/**
 * Represents {@link SCM} property.
 * <p/>
 * Date: 10/11/11
 *
 * @author Anton Kozak
 */
public class SCMProjectProperty extends BaseProjectProperty<SCM> {

    public SCMProjectProperty(ICascadingJob job) {
        super(job);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public SCM getDefaultValue() {
        return new NullSCM();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected boolean returnOriginalValue() {
        return isOverridden() || (null != getOriginalValue() && !getDefaultValue().equals(getOriginalValue()));
    }
    
    @Override
    protected boolean updateOriginalValue(SCM value, SCM cascadingValue) {
        if ((value instanceof NullSCM) && !(cascadingValue instanceof NullSCM)) {
            value = null;
            clearOriginalValue(value);
            return false;
        } else {
            return super.updateOriginalValue(value, cascadingValue);
        }
    }
}