/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/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 packager/legal/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.bind.xmlschema;

import com.sun.msv.grammar.ChoiceNameClass;
import com.sun.msv.grammar.DifferenceNameClass;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.ExpressionPool;
import com.sun.msv.grammar.Grammar;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.grammar.trex.ElementPattern;

/**
 * Plug that implements the semantics of the lax wildcard of XML Schema.
 * 
 * @since JAXB1.0
 * @author
 * 	Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class LaxWildcardPlug extends StrictWildcardPlug {
    
    /**
     * Union of all the name classes found so far.
     */
    private NameClass found;
    
    
    /**
     * Constructor for LaxWildcardPlug.
     * @param namespaces
     */
    public LaxWildcardPlug(NameClass namespaces) {
        super(namespaces);
    }

    public void connect(ExpressionPool pool, Grammar[] others) {
        found = null;
        super.connect(pool,others);
        
        NameClass rest = new DifferenceNameClass(namespaces,found).simplify();
        // build up lax content model
        ReferenceExp r = new ReferenceExp("lax");
        r.exp = pool.createZeroOrMore(pool.createChoice(
            pool.createAnyString(),
            pool.createChoice(
                pool.createAttribute(NameClass.ALL),
                new ElementPattern(NameClass.ALL,r))));
        
        
        this.exp = pool.createChoice( this.exp,
            new ElementPattern(rest,r));            
    }
    
    protected void onElementFound( ElementExp elem ) {
        super.onElementFound(elem);
        
        // record what are found
        if(found==null)     found = elem.getNameClass();
        else                found = new ChoiceNameClass(found,elem.getNameClass());
    }

}
