/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.xsom.impl;

import com.sun.xml.xsom.XSAttGroupDecl;
import com.sun.xml.xsom.XSAttributeDecl;
import com.sun.xml.xsom.XSComplexType;
import com.sun.xml.xsom.XSContentType;
import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSIdentityConstraint;
import com.sun.xml.xsom.XSSimpleType;
import com.sun.xml.xsom.XSTerm;
import com.sun.xml.xsom.XSType;

/**
 * Reference to other schema components.
 * 
 * <p>
 * There are mainly two different types of references. One is
 * the direct reference, which is only possible when schema components
 * are already available when references are made.
 * The other is the lazy reference, which keeps references by names
 * and later look for the component by name.
 * 
 * <p>
 * This class defines interfaces that define the behavior of such
 * references and classes that implement direct reference semantics.
 * 
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public abstract class Ref {
    
    public static interface Term {
        /** Obtains a reference as a term. */
        XSTerm getTerm();
    }

    public static interface Type {
        /** Obtains a reference as a type. */
        XSType getType();
    }

    public static interface ContentType {
        XSContentType getContentType();
    }
    
    public static interface SimpleType extends Ref.Type {
        public XSSimpleType getType();
    }
    
    public static interface ComplexType extends Ref.Type {
        public XSComplexType getType();
    }
    
    public static interface Attribute {
        XSAttributeDecl getAttribute();
    }

    public static interface AttGroup {
        XSAttGroupDecl get();
    }
    
    public static interface Element extends Term {
        XSElementDecl get();
    }

    public static interface IdentityConstraint {
        XSIdentityConstraint get();
    }
//
//    
//    private static void _assert( boolean b ) {
//        if(!b)
//            throw new InternalError("assertion failed");
//    }
}
