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AEM bundle for the Magento GraphQL data models and query builders

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/**
 * Copyright 2017 Shopify
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.shopify.graphql.support;

import java.io.Serializable;

/**
 * Created by henrytao on 9/7/17.
 */

public final class Input implements Serializable {

  private final T value;
  private final boolean defined;

  public static  Input value(@Nullable T value) {
    return new Input<>(value, true);
  }

  public static  Input optional(@Nullable T value) {
    return value != null ? value(value) : Input.undefined();
  }

  public static  Input undefined() {
    return new Input<>(null, false);
  }

  private Input(T value, boolean defined) {
    this.value = value;
    this.defined = defined;
  }

  public T getValue() {
    return value;
  }

  public boolean isDefined() {
    return defined;
  }
}