/*
 * @(#)$Id: IncludeMergeState.java,v 1.9 2002/03/04 02:12:04 kk122374 Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.reader.trex;

import com.sun.msv.reader.AbortException;
import com.sun.msv.reader.State;
import com.sun.msv.reader.SimpleState;
import com.sun.msv.util.StartTagInfo;

/**
 * <include> element as an immediate child of <grammar> element.
 * 
 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class IncludeMergeState extends SimpleState {
	
	protected State createChildState( StartTagInfo tag ) {
		// no child element is allowed by default.
		return null;
	}
	
	protected void endSelf() {
		// For RELAX NG, inclusion has to be done at the endSelf method,
		// not in the startSelf method.
		final String href = startTag.getAttribute("href");

		if(href==null)
		{// name attribute is required.
			reader.reportError( TREXBaseReader.ERR_MISSING_ATTRIBUTE,
				"include","href");
			// recover by ignoring this include element
		}
		else
            try {
			    // parse specified file
			    reader.switchSource(this,href,new RootMergedGrammarState());
            } catch( AbortException e ) {
                // recover by ignoring the error
            }
		
		super.endSelf();
	}
}