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package com.amadornes.artifactural.gradle;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.function.UnaryOperator;
public class ReflectionUtils {
public static <T> void alter(Object target, String name, UnaryOperator<T> operator) {
try {
Object prev = target;
Field f = null;
for (String n : name.split("\\.")) {
f = findField(target.getClass(), n);
if(f == null) throw new IllegalStateException("Could not find '" + name + "'");
f.setAccessible(true);
prev = target;
target = f.get(target);
}
if(f == null) throw new IllegalStateException("Could not find '" + name + "'");
f.set(prev, operator.apply((T) target));
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex);
}
}
private static Field findField(Class<?> clazz, String name) {
while (clazz != Object.class) {
for (Field f : clazz.getDeclaredFields()) {
if (f.getName().equals(name)) {
return f;
}
}
clazz = clazz.getSuperclass();
}
return null;
}
/**
* Invokes a method (can be private).
*/
public static <T> T invoke(Object target, Class<?> type, String name, Object... args) {
try {
Method method = type.getDeclaredMethod(name);
method.setAccessible(true);
return (T) method.invoke(target, args);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}
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