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/* RelaxNGSchemaFactory.java --

   Copyright (C) 2006  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.xml.validation.relaxng;

import java.io.IOException;

import java.net.URL;

import javax.xml.XMLConstants;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.Source;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamSource;

import javax.xml.validation.Schema;

import javax.xml.validation.SchemaFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import org.w3c.dom.ls.LSResourceResolver;

import org.xml.sax.ErrorHandler;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

/**

 * Schema factory for RELAX NG grammars.

 *

 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

public class RELAXNGSchemaFactory

  extends SchemaFactory

{

  LSResourceResolver resourceResolver;

  ErrorHandler errorHandler;

  public LSResourceResolver getResourceResolver()

  {

    return resourceResolver;

  }

  public void setResourceResolver(LSResourceResolver resourceResolver)

  {

    this.resourceResolver = resourceResolver;

  }

  public ErrorHandler getErrorHandler()

  {

    return this.errorHandler;

  }

  public void setErrorHandler(ErrorHandler errorHandler)

  {

    this.errorHandler = errorHandler;

  }

  public boolean isSchemaLanguageSupported(String schemaLanguage)

  {

    return XMLConstants.RELAXNG_NS_URI.equals(schemaLanguage);

  }

  public Schema newSchema()

    throws SAXException

  {

    // TODO

    throw new UnsupportedOperationException();

  }

  public Schema newSchema(Source[] schemata)

    throws SAXException

  {

    if (schemata == null || schemata.length != 1)

      throw new IllegalArgumentException("must specify one source");

    // TODO multiple schemata

    // TODO compact syntax

    try

      {

        Document doc = getDocument(schemata[0]);

        FullSyntaxBuilder builder = new FullSyntaxBuilder();

        return builder.parse(doc);

      }

    catch (IOException e)

      {

        SAXException e2 = new SAXException(e.getMessage());

        e2.initCause(e);

        throw e2;

      }

  }

  private static Document getDocument(Source source)

    throws SAXException, IOException

  {

    if (source instanceof DOMSource)

      {

        Node node = ((DOMSource) source).getNode();

        if (node != null && node instanceof Document)

          return (Document) node;

      }

    String url = source.getSystemId();

    try

      {

        InputSource input = new InputSource(url);

        if (source instanceof StreamSource)

          {

            StreamSource streamSource = (StreamSource) source;

            input.setByteStream(streamSource.getInputStream());

            input.setCharacterStream(streamSource.getReader());

          }

        if (input.getByteStream() == null &&

            input.getCharacterStream() == null &&

            url != null)

          input.setByteStream(new URL(url).openStream());

        DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();

        f.setNamespaceAware(true);

        f.setCoalescing(true);

        f.setExpandEntityReferences(true);

        f.setIgnoringComments(true);

        f.setIgnoringElementContentWhitespace(true);

        DocumentBuilder b = f.newDocumentBuilder();

        return b.parse(input);

      }

    catch (ParserConfigurationException e)

      {

        SAXException e2 = new SAXException(e.getMessage());

        e2.initCause(e);

        throw e2;

      }

  }

}