package org.apache.maven.shared.runtime;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import java.net.MalformedURLException;

 import java.net.URL;

 import org.codehaus.plexus.util.StringUtils;

 /**

  * Provides various utility methods for working with classes.

  * 

  * @author <a href="mailto:markh@apache.org">Mark Hobson</a>

  * @version $Id: ClassUtils.java 831910 2009-11-02 15:05:33Z markh $

  */

 final class ClassUtils

 {

     // constructors -----------------------------------------------------------

     /**

      * {@code ClassUtils} is not intended to be instantiated.

      */

     private ClassUtils()

     {

         throw new AssertionError();

     }

     // public methods ---------------------------------------------------------

     /**

      * Gets a URL to the specified class's default package. For example, if the class {@code foo.Bar} is supplied, then

      * a URL to the directory above {@code foo} is returned.

      * 

      * @param klass

      *            the class to obtain the base URL for

      * @return a URL to the class's default package

      * @throws MalformedURLException

      *             if the base URL cannot be determined

      */

     public static URL getBaseURL( Class<?> klass )

         throws MalformedURLException

     {

         URL url = getURL( klass );

         String className = klass.getName();

         int n = StringUtils.countMatches( className, "." );

         String relativePath = StringUtils.repeat( "../", n );

         return new URL( url, relativePath );

     }

     /**

      * Gets a URL to the specified class.

      * 

      * @param klass

      *            the class to obtain the URL for

      * @return a URL to the class, or {@code null} if it cannot be found

      */

     public static URL getURL( Class<?> klass )

     {

         ClassLoader classLoader = klass.getClassLoader();

         String path = klass.getName().replace( '.', '/' ) + ".class";

         return classLoader.getResource( path );

     }

 }