Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright 2016 Alex Yanchenko
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

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

public class Main {
    public static Class<?>[] getFieldGenericArgs(Field field) {
        Type genericType = field.getGenericType();
        if (genericType instanceof ParameterizedType) {
            return getGenericArgs((ParameterizedType) genericType);
        } else {
            return new Class<?>[0];
        }
    }

    public static Class<?>[] getGenericArgs(ParameterizedType genericType) {
        Type[] typeArr = genericType.getActualTypeArguments();
        Class<?>[] argsArr = new Class<?>[typeArr.length];
        for (int i = 0; i < typeArr.length; i++) {
            Type t = typeArr[i];
            if (t instanceof ParameterizedType) {
                // TODO full hierarchy
                t = ((ParameterizedType) t).getRawType();
            }
            String clsName = t.toString().replaceFirst("^(class|interface) ", "");
            argsArr[i] = classForName(clsName);
        }
        return argsArr;
    }

    public static Class<?> classForName(String clsName) throws IllegalArgumentException {
        try {
            return Class.forName(clsName);
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException(e);
        }
    }
}