/*

  * 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.

  */

 package org.apache.commons.classscan.builtin;

 import java.io.File;

 import java.io.FileNotFoundException;

 import java.io.IOException;

 import java.net.URI;

 import java.net.URISyntaxException;

 import java.net.URL;

 import org.apache.commons.classscan.MetaRegistry;

 import org.apache.commons.classscan.spi.ClassPathElementFactory;

 import org.apache.commons.classscan.spi.model.SpiClassPathElement;

 public class DefaultClassPathElementFactory implements ClassPathElementFactory {

         @Override

         public SpiClassPathElement getClassPathElement(MetaRegistry metaRegistry, URL url) throws IOException {

                 String scheme= url.getProtocol();

                 if(scheme.equals("file")) {

                         try {

                                 return createFileClassPathElement(url);

                         } catch (URISyntaxException e) {

                                 FileNotFoundException ex = new FileNotFoundException(url.toExternalForm()+" not found");

                                 ex.initCause(e);

                                 throw ex;

                         }

                 }

                 else if(scheme.equals("jar")) {

                     return new JarClassPathElement(url);                        

                 }

                 return null;

         }

     private SpiClassPathElement createFileClassPathElement(URL url) throws IOException, URISyntaxException {

             File location = new File(url.toURI());

             if (!location.canRead()) {

                     throw new FileNotFoundException(location + " can not be read");

             }

             if (location.isDirectory()) {

                     return new FileClassPathElement(location);

             }

             URI fileUri = location.toURI();

                 URI jarURI = new URI("jar:" + fileUri.toString() + "!/");

             return new JarClassPathElement(jarURI.toURL());

     }

 }