Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.io.*;

import java.net.*;

import java.util.*;

public class Main {
    public static <T> Set<Class<T>> findClassesAssignableFrom(String packageName, Class<T> assignableFrom)
            throws IOException, ClassNotFoundException {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        Set<Class<T>> classes = new HashSet<Class<T>>();
        String path = packageName.replace('.', '/');
        URL resource = loader.getResource(path);
        if (resource != null) {
            String filePath = resource.getFile();
            if (filePath != null && new File(filePath).isDirectory()) {
                for (String file : new File(filePath).list()) {
                    if (file.endsWith(".class")) {
                        String name = packageName + '.' + file.substring(0, file.indexOf(".class"));
                        Class<T> clazz = (Class<T>) Class.forName(name);
                        if (assignableFrom.isAssignableFrom(clazz))
                            classes.add(clazz);
                    }
                }
            }
        }
        return classes;
    }
}