ClassUtils.java Source code

Introduction

Here is the source code for ClassUtils.java

Source

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public abstract class ClassUtils {
    static public ParameterizedType getParameterizedType(Class<?> target) {
        Type[] types = getGenericType(target);
        if (types.length > 0 && types[0] instanceof ParameterizedType) {
            return (ParameterizedType) types[0];
        }
        return null;
    }

    static public Type[] getParameterizedTypes(Class<?> target) {
        Type[] types = getGenericType(target);
        if (types.length > 0 && types[0] instanceof ParameterizedType) {
            return ((ParameterizedType) types[0]).getActualTypeArguments();
        }
        return null;
    }

    static public Type[] getGenericType(Class<?> target) {
        if (target == null)
            return new Type[0];
        Type[] types = target.getGenericInterfaces();
        if (types.length > 0) {
            return types;
        }
        Type type = target.getGenericSuperclass();
        if (type != null) {
            if (type instanceof ParameterizedType) {
                return new Type[] { type };
            }
        }
        return new Type[0];
    }

}