Java ClassPath Get getClassFromLibs(String className, List libs, boolean useSystemClassPath)

Description

get Class From Libs

License

Apache License

Declaration

public static <T> Class<T> getClassFromLibs(String className, List<String> libs, boolean useSystemClassPath)
            throws ClassNotFoundException 

Method Source Code

//package com.java2s;
/*/*from w  w w  .  j  ava2s  . c  o m*/
 * Copyright 2014 Lukas Benda <lbenda at lbenda.cz>.
 *
 * 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.net.*;
import java.util.*;

public class Main {
    public static <T> Class<T> getClassFromLibs(String className, List<String> libs, boolean useSystemClassPath)
            throws ClassNotFoundException {
        ClassLoader clr = createClassLoader(libs, useSystemClassPath);
        //noinspection unchecked
        return (Class<T>) clr.loadClass(className);
    }

    public static ClassLoader createClassLoader(List<String> libs, boolean useSystemClassPath) {
        List<URL> urls = new ArrayList<>(libs.size());
        libs.forEach(lib -> {
            try {
                urls.add((new File(lib)).toURI().toURL());
            } catch (MalformedURLException e) {
                throw new RuntimeException("The file wasn't readable: " + lib, e);
            }
        });

        URLClassLoader urlCl;
        if (useSystemClassPath) {
            urlCl = new URLClassLoader(urls.toArray(new URL[urls.size()]), System.class.getClassLoader());
        } else {
            urlCl = new URLClassLoader(urls.toArray(new URL[urls.size()]));
        }
        return urlCl;
    }
}

Related

1. getClassLoaderClasspath(ClassLoader loader)
2. getClassPath()
3. getClasspath()
4. getClasspath()