/*
    * 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!");
         }
     }
 
 }