Base.java

/*
 * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package com.sun.xml.internal.rngom.parse.host;

import com.sun.xml.internal.rngom.ast.builder.Annotations;
import com.sun.xml.internal.rngom.ast.om.Location;

/**
 * 
 * @author
 *      Kohsuke Kawaguchi (kk@kohsuke.org)
 */
public class Base {
    protected AnnotationsHost cast( Annotations ann ) {
        if(ann==null)
            return nullAnnotations;
        else
            return (AnnotationsHost)ann;
    }
    
    protected LocationHost cast( Location loc ) {
        if(loc==null)
            return nullLocation;
        else
            return (LocationHost)loc;
    }
    
    private static final AnnotationsHost nullAnnotations = new AnnotationsHost(null,null);
    private static final LocationHost nullLocation = new LocationHost(null,null);
}