Java Class Path Create getClassBasePath(URL classUrl, Class clazz)

Description

get Class Base Path

License

Apache License

Declaration

public static String getClassBasePath(URL classUrl, Class<?> clazz) 

Method Source Code

//package com.java2s;
/**/*  ww  w . j a v  a2  s .c om*/
 * 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.
 * 
 * Modified by the WebMapReduce developers.
 */

import java.net.*;

public class Main {
    public static String getClassBasePath(URL classUrl, Class<?> clazz) {
        return getClassBasePath(classUrl, clazz.getName());
    }

    public static String getClassBasePath(URL classUrl, String className) {
        String codePath;
        if (classUrl != null) {
            boolean inJar = classUrl.getProtocol().equals("jar");
            codePath = classUrl.toString();
            if (codePath.startsWith("jar:")) {
                codePath = codePath.substring("jar:".length());
            }
            if (codePath.startsWith("file:")) { // can have both
                codePath = codePath.substring("file:".length());
            }
            if (inJar) {
                // A jar spec: remove class suffix in /path/my.jar!/package/Class
                int bang = codePath.lastIndexOf('!');
                codePath = codePath.substring(0, bang);
            } else {
                // A class spec: remove the /my/package/Class.class portion
                int pos = codePath.lastIndexOf(classNameToPath(className));
                if (pos == -1) {
                    throw new IllegalArgumentException(
                            "invalid codePath: className=" + className + " codePath=" + codePath);
                }
                codePath = codePath.substring(0, pos);
            }
        } else {
            codePath = null;
        }
        return codePath;
    }

    public static String classNameToPath(String className) {
        String relPath = className;
        relPath = relPath.replace('.', '/');
        relPath += ".class";
        return relPath;
    }
}

Related

1. getClassPathArchiveContents(final URL resource)
2. getClasspathResourceURL(String resourceName)
3. getClasspathUrl(final Class aClass, final String aPath)
4. getClasspathURL(final String name)