Java Class Path getSystemLibraryPath(Class locatorClass, String subDir)

Description

get System Library Path

License

Open Source License

Declaration

public static String getSystemLibraryPath(Class locatorClass, String subDir) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright ? 2012, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from   w  w w . java  2s .c  o m
 * IBM Corporation - initial API and implementation
 *
 *******************************************************************************/

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;

public class Main {
    public static String getSystemLibraryPath(Class locatorClass, String subDir) {

        String name = locatorClass.getCanonicalName();
        name = "/" + name.replace('.', '/') + ".class";
        URL classUrl = locatorClass.getResource(name);

        if (classUrl != null && classUrl.getProtocol().equals("file")) {
            String initializerPath = classUrl.getFile();

            initializerPath = getSystemLibraryPath(initializerPath, name, subDir);

            try {
                initializerPath = URLDecoder.decode(initializerPath, System.getProperty("file.encoding"));
            } catch (UnsupportedEncodingException e) {
            }

            return initializerPath;
        } else if (classUrl != null && classUrl.getProtocol().equals("jar")) {
            String initializerPath = classUrl.getFile();
            if (initializerPath.startsWith("file:")) {
                initializerPath = initializerPath.substring(5);
            }

            initializerPath = getSystemLibraryPath(initializerPath, name, subDir);
            try {
                initializerPath = URLDecoder.decode(initializerPath, System.getProperty("file.encoding"));
            } catch (UnsupportedEncodingException e) {
            }

            return initializerPath;
        }

        return null;
    }

    private static String getSystemLibraryPath(String fileURL, String qualClassName, String subDir) {
        String initializerPath = fileURL.replace('\\', '/');
        int index = initializerPath.lastIndexOf(qualClassName);
        initializerPath = initializerPath.substring(0, index);
        try {
            initializerPath = new URI(initializerPath).getPath();
        } catch (URISyntaxException e) {
            // Fall back on previous routine.
            initializerPath = initializerPath.replaceAll("%20", " ");
        }

        boolean isJar = initializerPath.endsWith(".jar!");

        //Strip off last segment (either the jar file name, or the bin directory name)
        index = initializerPath.lastIndexOf("/");
        initializerPath = initializerPath.substring(0, index);

        if (isJar) {
            //Strip off the directory containing the jar file
            index = initializerPath.lastIndexOf("/");
            initializerPath = initializerPath.substring(0, index + 1);
            //Add back in the sub directory
            return initializerPath + subDir;
        } else {
            return initializerPath + "/" + subDir;
        }

    }
}

Related

1. getPath(final String aPath, final Class aClass)
2. getPath(String name, Class relativeTo)
3. getProgramRootPath(Class clazz)
4. getRootAbsolutePathname(final Class clazz)
5. getRunClassAllPath(Object obj)