/*

  * Copyright 2007 - 2007 JEuclid, http://jeuclid.sf.net

  * 

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 /* $Id: BatikDetector.java,v 584e9b40f728 2009/04/09 07:41:44 maxberger $ */

 package net.sourceforge.jeuclid.converter;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import net.sourceforge.jeuclid.elements.generic.JEuclidDOMImplementation;

 import net.sourceforge.jeuclid.elements.support.ClassLoaderSupport;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.w3c.dom.DOMImplementation;

 /**

  * Detects if Batik is in the class path and registers it if its available.

  * 

  * @version $Revision: 584e9b40f728 $

  */

 public final class BatikDetector implements ConverterDetector {

     /**

      * Logger for this class

      */

     private static final Log LOGGER = LogFactory.getLog(BatikDetector.class);

     /**

      * Default constructor.

      */

     public BatikDetector() {

         // Empty on purpose

     }

     private static DOMImplementation findSVGDOMImplementation() {

         DOMImplementation impl;

         try {

             final Class<?> svgdomimpl = ClassLoaderSupport.getInstance()

                     .loadClass(

                             "org.apache.batik.dom.svg.SVGDOMImplementation");

             final Method getDOMimpl = svgdomimpl.getMethod(

                     "getDOMImplementation", new Class<?>[] {});

             impl = (DOMImplementation) getDOMimpl.invoke(null,

                     (Object[]) null);

             // CHECKSTYLE:OFF

             // In this case, ANY runtime exception must be caught, since batik

             // may not be available.

         } catch (final RuntimeException e) {

             // CHECKSYTLE:ON

             impl = null;

         } catch (final LinkageError e) {

             impl = null;

         } catch (final ClassNotFoundException e) {

             impl = null;

         } catch (final NoSuchMethodException e) {

             impl = null;

         } catch (final IllegalAccessException e) {

             impl = null;

         } catch (final InvocationTargetException e) {

             impl = null;

         }

         if (impl == null) {

             impl = JEuclidDOMImplementation.getInstance();

         }

         return impl;

     }

     /**

      * Detects if Batik is in the classpath.

      * 

      * @param registry

      *            ConverterRegisty to register with.

      */

     public void detectConversionPlugins(final ConverterRegistry registry) {

         try {

             ClassLoaderSupport.getInstance().loadClass(

                     "org.apache.batik.svggen.SVGGraphics2D");

             BatikDetector.LOGGER.debug("Batik detected!");

             registry

                     .registerMimeTypeAndSuffix(

                             net.sourceforge.jeuclid.converter.Converter.TYPE_SVG,

                             net.sourceforge.jeuclid.converter.Converter.EXTENSION_SVG,

                             true);

             final DOMImplementation impl = BatikDetector

                     .findSVGDOMImplementation();

             if (impl != null) {

                 registry.registerConverter(

                         net.sourceforge.jeuclid.converter.Converter.TYPE_SVG,

                         new BatikConverter(impl), true);

             }

         } catch (final ClassNotFoundException e) {

             BatikDetector.LOGGER.debug("Batik is not in classpath!");

         }

     }

 }