Java Class Find getClassesWithInterface(String packageName, Class interfaceClazz)

Description

get Classes With Interface

License

Open Source License

Declaration

public static List<Class<?>> getClassesWithInterface(String packageName, Class<?> interfaceClazz)
            throws ClassNotFoundException 

Method Source Code

//package com.java2s;
import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static List<Class<?>> getClassesWithInterface(String packageName, Class<?> interfaceClazz)
            throws ClassNotFoundException {

        if (interfaceClazz == null || !interfaceClazz.isInterface()) {
            return null;
        }/*from   w  ww.  ja v a 2s .c  o  m*/

        List<Class<?>> classes = new ArrayList<Class<?>>();

        List<Class<?>> list = getClasses(packageName);

        if (list != null) {
            for (Class<?> clazz : list) {
                if (interfaceClazz.isAssignableFrom(clazz)) {
                    classes.add(clazz);
                }
            }
        }

        return classes;
    }

    public static List<Class<?>> getClasses(String packageName) throws ClassNotFoundException {
        String pkgDirName = packageName.replace('.', '/');
        List<Class<?>> classes = new ArrayList<Class<?>>();
        File pkgDir = null;
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        URL resource = loader.getResource(pkgDirName);
        if (resource == null) {
            return null;
        }
        pkgDir = new File(resource.getFile());
        if (pkgDir.exists()) {
            String[] files = pkgDir.list();
            for (int i = 0; i < files.length; i++) {
                if (files[i].endsWith(".class")) {
                    classes.add(Class.forName(packageName + '.' + files[i].substring(0, files[i].length() - 6)));
                }
            }
        } else {
            return null;
        }
        return classes;
    }
}

Related

1. getClassesAsList(String pckgname, Class type)
2. getClassesDir(Class classWithinDir)
3. getClassesExtending(Class rootClass, String pattern)
4. getClassesInDirectory(File directory, String packageName, ClassLoader classLoader)
5. getClassesLocation(Class cls)