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/*
 * Copyright 2013-2018 (c) MuleSoft, 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 org.raml.utilities.builder;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

public class NonNullableField implements Field {

  private final T payload;

  private NonNullableField(T payload) {
    this.payload = payload;
  }

  public static  NonNullableField unset() {
    return new NonNullableField<>(null);
  }

  public static  NonNullableField of(T value) {
    checkNotNull(value);

    return new NonNullableField<>(value);
  }

  public static  NonNullableField ofNullable(T value) {
    return value == null ? NonNullableField.unset() : of(value);
  }

  @Override
  public T get() {
    checkState(isSet(), "value not set");

    return payload;
  }

  @Override
  public boolean isSet() {
    return payload != null;
  }
}