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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [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
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 */
package com.sun.tools.xjc.reader.internalizer;

import java.io.IOException;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;

import com.sun.istack.SAXParseException2;

import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.XMLFilterImpl;

/**
 * XMLFilter that finds references to other schema files from
 * SAX events.
 * 
 * This implementation is a base implementation for typical case
 * where we just need to look for a particular attribute which
 * contains an URL to another schema file.
 * 
 * @author
 *  Kohsuke Kawaguchi ([email protected])
 */
public abstract class AbstractReferenceFinderImpl extends XMLFilterImpl {
    protected final DOMForest parent;
        
    protected AbstractReferenceFinderImpl( DOMForest _parent ) {
        this.parent = _parent;
    }
    
    /**
     * IF the given element contains a reference to an external resource,
     * return its URL.
     * 
     * @param nsURI
     *      Namespace URI of the current element
     * @param localName
     *      Local name of the current element
     * @return
     *      It's OK to return a relative URL.
     */
    protected abstract String findExternalResource( String nsURI, String localName, Attributes atts);
    
    public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
        throws SAXException {
        super.startElement(namespaceURI, localName, qName, atts);
        
        String relativeRef = findExternalResource(namespaceURI,localName,atts);
        if(relativeRef==null)   return; // non found
        
        try {
            // absolutize URL.
            String ref = new URI(locator.getSystemId()).resolve(new URI(relativeRef)).toString();

            // then parse this schema as well,
            // but don't mark this document as a root.
            parent.parse(ref,false);
        } catch( URISyntaxException e ) {
            String msg = e.getMessage();
            if(new File(relativeRef).exists()) {
                msg = Messages.format(Messages.ERR_FILENAME_IS_NOT_URI)+' '+msg;
            }

            SAXParseException spe = new SAXParseException2(
                Messages.format(Messages.ERR_UNABLE_TO_PARSE,relativeRef, msg),
                locator, e );

            fatalError(spe);
            throw spe;
        } catch( IOException e ) {
            SAXParseException spe = new SAXParseException2(
                Messages.format(Messages.ERR_UNABLE_TO_PARSE,relativeRef,e.getMessage()),
                locator, e );

            fatalError(spe);
            throw spe;
        }
    }
        
    private Locator locator;
        
    public void setDocumentLocator(Locator locator) {
        super.setDocumentLocator(locator);
        this.locator = locator;
    }
};