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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
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 * 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,
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 */

package com.sun.msv.reader.xmlschema;

import com.sun.msv.reader.AbortException;
import com.sun.msv.reader.ChildlessState;

/**
 * used to parse <import> element.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class ImportState extends ChildlessState {
    
    protected void startSelf() {
        super.startSelf();
        final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
        
        // TODO: @schemaLocation is optional.
        String namespace = startTag.getAttribute("namespace");
        if( namespace==null )   namespace="";
        
        if( namespace.equals(reader.currentSchema.targetNamespace) ) {
            reader.reportError( XMLSchemaReader.ERR_IMPORTING_SAME_NAMESPACE );
            return;
        }
        
        if( reader.isSchemaDefined( reader.getOrCreateSchema(namespace) ) )
            // this grammar is already defined.
            // so ignore it.
            return;
                
        try {
            reader.switchSource( this,
                new RootIncludedSchemaState(reader.sfactory.schemaHead(namespace)) );
        } catch( AbortException e ) {
            // recover by ignoring the error
        }
    }
}




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