com.squarespace.compiler.common.Nothing Maven / Gradle / Ivy

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/**
 * Copyright, 2017, Squarespace, 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.squarespace.compiler.common;

import java.util.NoSuchElementException;


/**
 * Represents absence of a value in the Maybe monad.
 */
public class Nothing implements Maybe {

  static final Maybe NOTHING = new Nothing<>();

  @Override
  public boolean isJust() {
    return false;
  }

  @Override
  public T get() {
    throw new NoSuchElementException("Nothing.get() is not valid");
  }

}