Initializer.java

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.lang;
 
import java.util.Vector;
import javolution.context.LogContext;
 
public class Initializer {
 
    public static final Configurable<Boolean> SHOW_INITIALIZED = new Configurable<Boolean>() {
        @Override
        protected Boolean getDefault() {
            return false;
        }
    };
 
    private final ClassLoader classLoader;
 
    public Initializer(ClassLoader classLoader) {
        this.classLoader = classLoader;
    }
 
    @SuppressWarnings("unchecked")
    public Class<?>[] loadedClasses() {
        Class<?> cls = classLoader.getClass();
        while (cls != java.lang.ClassLoader.class) {
            cls = cls.getSuperclass();
        }
        try {
            java.lang.reflect.Field fldClasses = cls
                    .getDeclaredField("classes");
            fldClasses.setAccessible(true);
            Vector<Class<?>> list = (Vector<Class<?>>) fldClasses
                    .get(classLoader);
            Class<?>[] classes = new Class<?>[list.size()];
            for (int i = 0; i < classes.length; i++) {
                classes[i] = list.get(i);
            }
            return classes;
        } catch (Throwable e) {
            return null;
        }
    }
 
    public void loadClass(Class<?> cls) {
        try {
            classLoader.loadClass(cls.getName());
        } catch (ClassNotFoundException e) {
            LogContext.debug("Class " + cls + " not found.");
        }
    }
 
    public boolean initializeLoadedClasses() {
        boolean isInitializationSuccessful = true;
        int nbrClassesInitialized = 0;
        while (true) {
            Class<?>[] classes = loadedClasses();
            if (classes == null) {
                LogContext
                        .debug("Automatic class initialization not supported.");
                return false;
            }
            if (nbrClassesInitialized >= classes.length)
                break; // Done.
            for (int i = nbrClassesInitialized; i < classes.length; i++) {
                Class<?> cls = classes[i];
                try {
                    if (SHOW_INITIALIZED.get())
                        LogContext.debug("Initialize ", cls.getName());
                    Class.forName(cls.getName(), true, classLoader);
                } catch (ClassNotFoundException ex) {
                    isInitializationSuccessful = false;
                    LogContext.error(ex); // Should never happen.
                }
            }
            nbrClassesInitialized = classes.length;
        }
        LogContext.debug("Initialization of ", nbrClassesInitialized,
                " classes loaded by ", classLoader);
        return isInitializationSuccessful;
    }
 
}