/*
    *  Copyright 2012 Chris Pheby
    *
    *  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.jadira.scanner.file.locator;
  
  import java.io.File;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.StringTokenizer;
  
  import org.jadira.scanner.core.api.Locator;
  import org.jadira.scanner.core.exception.ClasspathAccessException;
  
  /**
   * Uses the java.class.path system property to obtain a list of URLs that represent the
   * CLASSPATH
   */
  public class JavaClasspathUrlLocator implements Locator<URL> {
      
  	@Override
  	public List<URL> locate() {
  
          List<URL> list = new ArrayList<URL>();
          String classpath = System.getProperty("java.class.path");
          StringTokenizer tokenizer = new StringTokenizer(classpath, File.pathSeparator);
  
          while (tokenizer.hasMoreTokens()) {
              
          	String path = tokenizer.nextToken();
              
              File fp = new File(path);
              if (!fp.exists()) {
                  throw new ClasspathAccessException("File in java.class.path does not exist: " + fp);
              }
              
              try {
                  list.add(fp.toURI().toURL());
              } catch (MalformedURLException e) {
              	throw new ClasspathAccessException("URL was invalid: " + fp.toURI().toString(), e);
              }
          }
          return list;
      }
  }