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package miscutil.core.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
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(String className) {
try {
Class.forName(className);
return true;
} catch (Throwable ex) {
// Class or one of its dependencies is not present...
return false;
}
}
public static Method getMethodViaReflection(Class<?> lookupClass, String methodName, boolean invoke) throws Exception{
Class<? extends Class> lookup = lookupClass.getClass();
Method m = lookup.getDeclaredMethod(methodName);
m.setAccessible(true);// Abracadabra
if (invoke){
m.invoke(lookup);// now its OK
}
return m;
}
public static Class getNonPublicClass(String className){
Class<?> c = null;
try {
c = Class.forName(className);
} catch (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 {
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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