driver-mapping/src/main/java/com/datastax/driver/mapping/ReflectionUtils.java

/*
 * Copyright (C) 2012-2017 DataStax Inc.
 *
 * 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.
 */
package com.datastax.driver.mapping;

import java.lang.reflect.Constructor;

/**
 * Utility methods related to reflection.
 */
class ReflectionUtils {

    static <T> T newInstance(Class<T> clazz) {
        Constructor<T> publicConstructor;
        try {
            publicConstructor = clazz.getConstructor();
        } catch (NoSuchMethodException e) {
            try {
                // try private constructor
                Constructor<T> privateConstructor = clazz.getDeclaredConstructor();
                privateConstructor.setAccessible(true);
                return privateConstructor.newInstance();
            } catch (Exception e1) {
                throw new IllegalArgumentException("Can't create an instance of " + clazz, e);
            }
        }
        try {
            return publicConstructor.newInstance();
        } catch (Exception e) {
            throw new IllegalArgumentException("Can't create an instance of " + clazz, e);
        }
    }

}