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package gtPlusPlus.core.util;
import java.lang.reflect.*;
public class ClassUtils {
/*
* @ if (isPresent("com.optionaldependency.DependencyClass")) { // This
* block will never execute when the dependency is not present // There is
* therefore no more risk of code throwing NoClassDefFoundException.
* executeCodeLinkingToDependency(); }
*/
public static boolean isPresent(final String className) {
try {
Class.forName(className);
return true;
} catch (final Throwable ex) {
// Class or one of its dependencies is not present...
return false;
}
}
@SuppressWarnings("rawtypes")
public static Method getMethodViaReflection(final Class<?> lookupClass, final String methodName,
final boolean invoke) throws Exception {
final Class<? extends Class> lookup = lookupClass.getClass();
final Method m = lookup.getDeclaredMethod(methodName);
m.setAccessible(true);// Abracadabra
if (invoke) {
m.invoke(lookup);// now its OK
}
return m;
}
public static Class<?> getNonPublicClass(final String className) {
Class<?> c = null;
try {
c = Class.forName(className);
} catch (final ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// full package name --------^^^^^^^^^^
// or simpler without Class.forName:
// Class<package1.A> c = package1.A.class;
if (null != c) {
// In our case we need to use
Constructor<?> constructor = null;
try {
constructor = c.getDeclaredConstructor();
} catch (NoSuchMethodException | SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// note: getConstructor() can return only public constructors
// so we needed to search for any Declared constructor
// now we need to make this constructor accessible
if (null != constructor) {
constructor.setAccessible(true);// ABRACADABRA!
try {
final Object o = constructor.newInstance();
return (Class<?>) o;
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
}
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