Java Jar File Find findContainingJar(Class my_class)

Description

Find a jar that contains a class of the same name, if any.

License

Apache License

Parameter

Parameter	Description
my_class	the class to find

Return

a jar file that contains the class, or null

Declaration

@SuppressWarnings("rawtypes")
public static String findContainingJar(Class my_class) 

Method Source Code

//package com.java2s;
/*/*from   w w  w  .j ava 2 s.  c o  m*/
 * Copyright [2013-2014] eBay Software Foundation
 *  
 * 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.
 */

import java.io.IOException;

import java.net.URL;
import java.net.URLDecoder;

import java.util.Enumeration;

public class Main {
    /**
     * Find a jar that contains a class of the same name, if any. It will return a jar file, even if that is not the
     * first thing on the class path that has a class with the same name.
     * 
     * @param my_class
     *            the class to find
     * @return a jar file that contains the class, or null
     */
    @SuppressWarnings("rawtypes")
    public static String findContainingJar(Class my_class) {
        ClassLoader loader = my_class.getClassLoader();
        String class_file = my_class.getName().replaceAll("\\.", "/") + ".class";
        try {
            for (Enumeration itr = loader.getResources(class_file); itr.hasMoreElements();) {
                URL url = (URL) itr.nextElement();
                if ("jar".equals(url.getProtocol())) {
                    String toReturn = url.getPath();
                    if (toReturn.startsWith("file:")) {
                        toReturn = toReturn.substring("file:".length());
                    }
                    // URLDecoder is a misnamed class, since it actually decodes
                    // x-www-form-urlencoded MIME type rather than actual
                    // URL encoding (which the file path has). Therefore it would
                    // decode +s to ' 's which is incorrect (spaces are actually
                    // either unencoded or encoded as "%20"). Replace +s first, so
                    // that they are kept sacred during the decoding process.
                    toReturn = toReturn.replaceAll("\\+", "%2B");
                    toReturn = URLDecoder.decode(toReturn, "UTF-8");
                    return toReturn.replaceAll("!.*$", "");
                }
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return null;
    }
}

Related

1. findAllPluginJars0(final File pluginPath)
2. findClassJar(final Class aClass)
3. findContainingJar( @SuppressWarnings("rawtypes") Class my_class, ClassLoader loader)
4. findContainingJar(Class clazz)
5. findContainingJar(Class clazz)
6. findContainingJar(Class myClass, Map packagedClasses)
7. findContainingJar(ClassLoader classLoader, String resourceName)