Java Path File Name nio getJarContainingClass(String path, String className)

Description

get Jar Containing Class

License

Apache License

Declaration

private static Path getJarContainingClass(String path, String className)
            throws IOException, ClassNotFoundException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2018 RaspInLoop//  ww  w .  j a v  a 2 s.c  o m
 * 
 * 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.File;
import java.io.FileFilter;
import java.io.IOException;

import java.nio.file.Path;

import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    private static Path getJarContainingClass(String path, String className)
            throws IOException, ClassNotFoundException {
        File[] files = new File(path).listFiles(new FileFilter() {

            @Override
            public boolean accept(File pathname) {
                return pathname.isDirectory() || pathname.getName().endsWith(".jar");
            }
        });

        for (File file : files) {
            Path pathFound = null;
            if (file.isDirectory()) {
                pathFound = getJarContainingClass(file.getPath(), className);
                if (pathFound != null)
                    return pathFound;
                else
                    continue;
            }
            // else look for classes in jars from current dir.
            JarFile jarFile = new JarFile(file);
            if (containsClass(jarFile, className)) {
                return file.toPath();
            }
        }
        // not found
        return null;
    }

    private static boolean containsClass(JarFile jarFile, String agentRunnerClassName) {

        Enumeration<JarEntry> e = jarFile.entries();
        while (e.hasMoreElements()) {
            JarEntry je = e.nextElement();
            if (je.isDirectory() || !je.getName().endsWith(".class")) {
                continue;
            }
            // -6 because of .class
            String className = je.getName().substring(0, je.getName().length() - 6);
            className = className.replace('/', '.');
            if (className.equals(agentRunnerClassName))
                return true;
        }
        return false;
    }
}

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7. getLocalFilePath(String localDirectory, String filename)
8. getManifestProperty(Path pathToJar, String propertyName)
9. getName(Path file)