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/* GnomeDocumentBuilder.java -

   Copyright (C) 2004 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.libxmlj.dom;

import java.io.InputStream;

import java.io.IOException;

import java.net.URL;

import javax.xml.parsers.DocumentBuilder;

import org.w3c.dom.Document;

import org.w3c.dom.DocumentType;

import org.w3c.dom.DOMImplementation;

import org.xml.sax.EntityResolver;

import org.xml.sax.ErrorHandler;

import org.xml.sax.InputSource;

import org.xml.sax.Locator;

import org.xml.sax.SAXException;

import org.xml.sax.SAXParseException;

import gnu.xml.libxmlj.util.NamedInputStream;

import gnu.xml.libxmlj.util.StandaloneDocumentType;

import gnu.xml.libxmlj.util.StandaloneLocator;

import gnu.xml.libxmlj.util.XMLJ;

/**

 * A JAXP DOM implementation that uses Gnome libxml2 as the underlying

 * parser and node representation.

 *

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

 */

public class GnomeDocumentBuilder

  extends DocumentBuilder

  implements DOMImplementation

{

  static

  {

    XMLJ.init();

  }

  // -- DocumentBuilder --

  private boolean validate;

  private boolean coalesce;

  private boolean expandEntities;

  private EntityResolver entityResolver;

  private ErrorHandler errorHandler;

  private boolean seenFatalError;

  /**

   * Constructs a new validating document builder.

   */

  public GnomeDocumentBuilder()

  {

    this(true, false, false);

  }

  /**

   * Constructs a new document builder.

   * @param validate whether to validate during parsing

   * @param coalesce whether to merge CDATA as text nodes

   * @param expandEntities whether to expand entity references

   */

  public GnomeDocumentBuilder(boolean validate,

                              boolean coalesce,

                              boolean expandEntities)

  {

    this.validate = validate;

    this.coalesce = coalesce;

    this.expandEntities = expandEntities;

  }

  public DOMImplementation getDOMImplementation()

  {

    return this;

  }

  public boolean isNamespaceAware()

  {

    return true;

  }

  public boolean isValidating()

  {

    return validate;

  }

  public Document newDocument()

  {

    return createDocument(null, null, null);

  }

  public Document parse(InputSource input)

    throws SAXException, IOException

  {

    NamedInputStream in = XMLJ.getInputStream(input);

    byte[] detectBuffer = in.getDetectBuffer();

    String publicId = input.getPublicId();

    String systemId = input.getSystemId();

    String base = XMLJ.getBaseURI(systemId);

    // Handle zero-length document

    if (detectBuffer == null)

      {

        throw new SAXParseException("No document element", publicId,

                                    systemId, 0, 0);

      }

    seenFatalError = false;

    return parseStream(in,

                       detectBuffer,

                       publicId,

                       systemId,

                       base,

                       validate,

                       coalesce,

                       expandEntities,

                       true, //entityResolver != null,

                       errorHandler != null);

  }

  private native Document parseStream(InputStream in,

                                      byte[] detectBuffer,

                                      String publicId,

                                      String systemId,

                                      String base,

                                      boolean validate,

                                      boolean coalesce,

                                      boolean expandEntities,

                                      boolean entityResolver,

                                      boolean errorHandler);

  public void setEntityResolver(EntityResolver resolver)

  {

    entityResolver = resolver;

  }

  public void setErrorHandler(ErrorHandler handler)

  {

    errorHandler = handler;

  }

  // -- DOMImplementation --

  public boolean hasFeature(String name, String version)

  {

    if (name.length() == 0)

      {

        return false;

      }

    name = name.toLowerCase();

    if (name.charAt(0) == '+')

      {

        name = name.substring(1);

      }

    if ("xml".equals(name) || "core".equals(name))

      {

        return (version == null ||

                "".equals(version) ||

                "1.0".equals(version) ||

                "2.0".equals(version) ||

                "3.0".equals(version));

      }

    else if ("ls".equals(name) || "ls-async".equals(name))

      {

        // TODO

        /*

        return (version == null ||

                "".equals(version) ||

                "3.0".equals(version));

                */

        return false;

      }

    else if ("traversal".equals(name))

      {

        return (version == null ||

                "".equals(version) ||

                "2.0".equals(version));

      }

    else if ("xpath".equals(name))

      {

        return (version == null ||

                "".equals(version) ||

                "3.0".equals(version));

      }

    return false;

  }

  // DOM Level 3

  public Object getFeature(String feature, String version)

  {

    if (hasFeature(feature, version))

      {

        return this;

      }

    return null;

  }

  public native Document createDocument(String namespaceURI,

                                        String qualifiedName,

                                        DocumentType doctype);

  public DocumentType createDocumentType(String qualifiedName,

                                         String publicId,

                                         String systemId)

  {

    return new StandaloneDocumentType(qualifiedName, publicId, systemId);

  }

  // Callback hooks from JNI

  private void setDocumentLocator(Object ctx, Object loc)

  {

    // ignore

  }

  private InputStream resolveEntity(String publicId, String systemId,

                                    String base)

    throws SAXException, IOException

  {

    String url = XMLJ.getAbsoluteURI(base, systemId);

    InputStream in = null;

    if (entityResolver != null)

      {

        InputSource source = entityResolver.resolveEntity(publicId, url);

        if (source != null)

          {

            in = XMLJ.getInputStream(source);

          }

      }

    if (in == null)

      {

        in  = XMLJ.getInputStream(new URL(url));

      }

    return in;

  }

  private void warning(String message,

                       int lineNumber,

                       int columnNumber,

                       String publicId,

                       String systemId)

    throws SAXException

  {

    if (!seenFatalError && errorHandler != null)

      {

        Locator l = new StandaloneLocator(lineNumber,

                                          columnNumber,

                                          publicId,

                                          systemId);

        errorHandler.warning(new SAXParseException(message, l));

      }

  }

  private void error(String message,

                     int lineNumber,

                     int columnNumber,

                     String publicId,

                     String systemId)

    throws SAXException

  {

    if (!seenFatalError && errorHandler != null)

      {

        Locator l = new StandaloneLocator(lineNumber,

                                          columnNumber,

                                          publicId,

                                          systemId);

        errorHandler.error(new SAXParseException(message, l));

      }

  }

  private void fatalError(String message,

                          int lineNumber,

                          int columnNumber,

                          String publicId,

                          String systemId)

    throws SAXException

  {

    if (!seenFatalError && errorHandler != null)

      {

        seenFatalError = true;

        Locator l = new StandaloneLocator(lineNumber,

                                          columnNumber,

                                          publicId,

                                          systemId);

        errorHandler.fatalError(new SAXParseException(message, l));

      }

  }

}