/*

  * 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.IOException;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.List;

 import java.util.Map;

 import java.util.regex.Pattern;

 import org.apache.commons.classscan.ClassPathElement;

 import org.apache.commons.classscan.ResourceFile;

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

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

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

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

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 public class BootstrapClassPath implements SpiClassPath {

     private static final Logger logger = LoggerFactory.getLogger(BootstrapClassPath.class);

     static Pattern PATH_SPLITTER = Pattern.compile(File.pathSeparator);

         private final SpiMetaRegistry registry;

         public BootstrapClassPath(SpiMetaRegistry registry) {

                 this.registry = registry;

         }

         @Override

         public List<? extends ClassPathElement> getClassPathElements() {

         return getBootstrapLocations();

     }

         private List<SpiClassPathElement> getBootstrapLocations() {

                 List<SpiClassPathElement> locations= new ArrayList<SpiClassPathElement>();

         for(String element : parseBootstrapClassPathValues()) {

                         try {

                         SpiClassPathElement location = checkLocation(element);

                         if(location!=null) {

                                 locations.add(location);

                         }

                         } catch (IOException e) {

                                 logger.info("Bootstrap Classpath element "+element+" ignored", e);

                         }

         }

                 return locations;

         }

         String[] parseBootstrapClassPathValues() {

                 return PATH_SPLITTER.split(System.getProperty("sun.boot.class.path"));

         }

         private SpiClassPathElement checkLocation(String element) throws IOException {

         File location = new File(element);

         return registry.createClassPathElement(location.toURI().toURL());

         }

         @Override

         public SpiMetaClassLoader createMetaClassLoader(SpiMetaRegistry registry, ClassLoader classLoader) {

                 if(classLoader!=null) {

                         throw new IllegalArgumentException("BootStrap ClassLoader should be null");

                 }

                 return new BootstrapMetaClassLoader(registry);

         }

         @Override

         public Map<ClassPathElement, ResourceFile> getResources(String fileName) {

                 return Collections.emptyMap();

         }

 }