Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2004-2014 the Seasar Foundation and the Others.
 *
 * 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.GenericArrayType;

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

import java.util.Arrays;
import java.util.Collections;

import java.util.List;

public class Main {
    protected static Type getGenericParameter(Type type, int index) {
        if (!ParameterizedType.class.isInstance(type)) {
            return null;
        }
        final List<Type> genericParameter = getGenericParameterList(type);
        if (genericParameter.isEmpty()) {
            return null;
        }
        return genericParameter.get(index);
    }

    protected static List<Type> getGenericParameterList(Type type) {
        if (ParameterizedType.class.isInstance(type)) {
            final ParameterizedType paramType = ParameterizedType.class.cast(type);
            return Arrays.asList(paramType.getActualTypeArguments());
        }
        if (GenericArrayType.class.isInstance(type)) {
            final GenericArrayType arrayType = GenericArrayType.class.cast(type);
            return getGenericParameterList(arrayType.getGenericComponentType());
        }
        @SuppressWarnings("unchecked")
        List<Type> emptyList = Collections.EMPTY_LIST;
        return emptyList;
    }
}