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/* JAXPFactory.java --

   Copyright (C) 2001 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.dom;

import java.io.IOException;

import org.w3c.dom.Document;

import org.w3c.dom.DOMImplementation;

import org.xml.sax.EntityResolver;

import org.xml.sax.ErrorHandler;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

import org.xml.sax.SAXException;

import org.xml.sax.SAXParseException;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParserFactory;

/**

 * DOM bootstrapping API, for use with JAXP.

 *

 * @see Consumer

 *

 * @author David Brownell

 */

public final class JAXPFactory

  extends DocumentBuilderFactory

{

  private static final String   PROPERTY = "http://xml.org/sax/properties/";

  private static final String   FEATURE = "http://xml.org/sax/features/";

  private SAXParserFactory      pf;

  /**

   * Default constructor.

   */

  public JAXPFactory()

  {

  }

  /**

   * Constructs a JAXP document builder which uses the default

   * JAXP SAX2 parser and the DOM implementation in this package.

   */

  public DocumentBuilder newDocumentBuilder()

    throws ParserConfigurationException

  {

    if (pf == null)

      {

        // Force use of AElfred2 since not all JAXP parsers

        // conform very well to the SAX2 API spec ...

        pf = new gnu.xml.aelfred2.JAXPFactory();

        // pf = SAXParserFactory.newInstance ();

      }

    // JAXP default: false

    pf.setValidating(isValidating());

    // FIXME:  this namespace setup may cause errors in some

    // conformant SAX2 parsers, which we CAN patch up by

    // splicing a "NSFilter" stage up front ...

    // JAXP default: false

    pf.setNamespaceAware(isNamespaceAware());

    try

      {

        // undo rude "namespace-prefixes=false" default

        pf.setFeature(FEATURE + "namespace-prefixes", true);

        return new JAXPBuilder(pf.newSAXParser().getXMLReader(), this);

      }

    catch (SAXException e)

      {

        String msg = "can't create JAXP DocumentBuilder: " + e.getMessage();

        throw new ParserConfigurationException(msg);

      }

  }

  /** There seems to be no useful specification for attribute names */

  public void setAttribute(String name, Object value)

    throws IllegalArgumentException

  {

    if ("http://java.sun.com/xml/jaxp/properties/schemaLanguage".equals(name))

      {

        // TODO

      }

    else

      {

        throw new IllegalArgumentException(name);

      }

  }

  /** There seems to be no useful specification for attribute names */

  public Object getAttribute(String name)

    throws IllegalArgumentException

  {

    throw new IllegalArgumentException(name);

  }

  static final class JAXPBuilder

    extends DocumentBuilder

    implements ErrorHandler

  {

    private Consumer    consumer;

    private XMLReader   producer;

    private DomImpl             impl;

    JAXPBuilder(XMLReader parser, JAXPFactory factory)

      throws ParserConfigurationException

    {

      impl = new DomImpl();

      // set up consumer side

      try

        {

          consumer = new Consumer();

        }

      catch (SAXException e)

        {

          throw new ParserConfigurationException(e.getMessage());

        }

      // JAXP defaults: true, noise nodes are good (bleech)

      consumer.setHidingReferences(factory.isExpandEntityReferences());

      consumer.setHidingComments(factory.isIgnoringComments());

      consumer.setHidingWhitespace(factory.isIgnoringElementContentWhitespace());

      consumer.setHidingCDATA(factory.isCoalescing());

      // set up producer side

      producer = parser;

      producer.setContentHandler(consumer.getContentHandler());

      producer.setDTDHandler(consumer.getDTDHandler());

      try

        {

          String        id;

          // if validating, report validity errors, and default

          // to treating them as fatal

          if (factory.isValidating ())

            {

              producer.setFeature(FEATURE + "validation", true);

              producer.setErrorHandler(this);

            }

          // always save prefix info, maybe do namespace processing

          producer.setFeature(FEATURE + "namespace-prefixes", true);

          producer.setFeature(FEATURE + "namespaces",

                              factory.isNamespaceAware());

          // set important handlers

          id = PROPERTY + "lexical-handler";

          producer.setProperty(id, consumer.getProperty(id));

          id = PROPERTY + "declaration-handler";

          producer.setProperty(id, consumer.getProperty(id));

        }

      catch (SAXException e)

        {

          throw new ParserConfigurationException(e.getMessage());

        }

    }

    public Document parse(InputSource source)

      throws SAXException, IOException

    {

      producer.parse(source);

      Document doc = consumer.getDocument();

      // TODO inputEncoding

      doc.setDocumentURI(source.getSystemId());

      return doc;

    }

    public boolean isNamespaceAware()

    {

      try

        {

          return producer.getFeature(FEATURE + "namespaces");

        }

      catch (SAXException e)

        {

          // "can't happen"

          throw new RuntimeException(e.getMessage());

        }

    }

    public boolean isValidating()

    {

      try

        {

          return producer.getFeature(FEATURE + "validation");

        }

      catch (SAXException e)

        {

          // "can't happen"

          throw new RuntimeException(e.getMessage());

        }

    }

    public void setEntityResolver(EntityResolver resolver)

    {

      producer.setEntityResolver(resolver);

    }

    public void setErrorHandler(ErrorHandler handler)

    {

      producer.setErrorHandler(handler);

      consumer.setErrorHandler(handler);

    }

    public DOMImplementation getDOMImplementation()

    {

      return impl;

    }

    public Document newDocument()

    {

      return new DomDocument();

    }

    // implementation of error handler that's used when validating

    public void fatalError(SAXParseException e)

      throws SAXException

    {

      throw e;

    }

    public void error(SAXParseException e)

      throws SAXException

    {

      throw e;

    }

    public void warning(SAXParseException e)

      throws SAXException

    {

      /* ignore */

    }

  }

}