Java Jar File Find findContainingJar(Class clazz)

Description

find Containing Jar

License

Apache License

Declaration

public static String findContainingJar(Class<?> clazz) 

Method Source Code

//package com.java2s;
/*//from  w  w  w  . j  av a  2 s . c o m
 * 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.io.IOException;

import java.net.URL;

import java.net.URLDecoder;
import java.util.Enumeration;

public class Main {
    public static String findContainingJar(Class<?> clazz) {
        return findContainingJar(clazz, null);
    }

    /**
     * Load the first jar library contains clazz with preferJarKeyword matched. If preferJarKeyword is null, just load the
     * jar likes Hadoop Commons' ClassUtil
     * @param clazz
     * @param preferJarKeyWord
     * @return
     */
    public static String findContainingJar(Class<?> clazz,
            String preferJarKeyWord) {
        ClassLoader loader = clazz.getClassLoader();
        String classFile = clazz.getName().replaceAll("\\.", "/")
                + ".class";

        try {
            Enumeration e = loader.getResources(classFile);

            URL url = null;
            do {
                if (!e.hasMoreElements()) {
                    if (url == null)
                        return null;
                    else
                        break;
                }

                url = (URL) e.nextElement();
                if (!"jar".equals(url.getProtocol()))
                    break;
                if (preferJarKeyWord != null
                        && url.getPath().indexOf(preferJarKeyWord) != -1)
                    break;
                if (preferJarKeyWord == null)
                    break;
            } while (true);

            String toReturn = url.getPath();
            if (toReturn.startsWith("file:")) {
                toReturn = toReturn.substring("file:".length());
            }

            toReturn = URLDecoder.decode(toReturn, "UTF-8");
            return toReturn.replaceAll("!.*$", "");
        } catch (IOException var6) {
            throw new RuntimeException(var6);
        }
    }
}

Related

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