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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
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 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

package com.sun.msv.reader.trex;

import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.AbortException;
import com.sun.msv.reader.ExpressionOwner;
import com.sun.msv.reader.ExpressionWithoutChildState;

/**
 * <include> element in the pattern. (<externalRef> of RELAX NG).
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class IncludePatternState extends ExpressionWithoutChildState implements ExpressionOwner
{
    protected Expression included = Expression.nullSet;
    // assign a default value just in case something goes wrong and onEndChild is not called.
    
    public void onEndChild( Expression included ) {
        this.included = included;
    }
    
    protected Expression makeExpression() {
        final String href = startTag.getAttribute("href");
        
        if(href==null)
        {// name attribute is required.
            reader.reportError( TREXBaseReader.ERR_MISSING_ATTRIBUTE,
                startTag.localName,"href");
            // recover by returning something that can be interpreted as Pattern
            return Expression.nullSet;
        }
        
        try {
            reader.switchSource(this,href,new RootIncludedPatternState(this));
        } catch( AbortException e ) {} // recover by ignoring an error
        
        // onEndChild method is called inside the above function call and
        // included will be set.
        
        return included;
    }
}