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/*
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *     https://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.google.appengine.api.datastore;

import java.io.Serializable;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A human-readable phone number. No validation is performed because phone numbers have many
 * different formats - local, long distance, domestic, international, internal extension, TTY, VOIP,
 * SMS, and alternative networks like Skype, XFire and Roger Wilco. They all have their own
 * numbering and addressing formats.
 *
 */
public final class PhoneNumber implements Serializable, Comparable {

  public static final long serialVersionUID = -8968032543663409348L;

  // This attribute needs to be non-final to support GWT serialization
  private String number;

  public PhoneNumber(String number) {
    if (number == null) {
      throw new NullPointerException("number must not be null");
    }
    this.number = number;
  }

  /**
   * This constructor exists for frameworks (e.g. Google Web Toolkit) that require it for
   * serialization purposes. It should not be called explicitly.
   */
  @SuppressWarnings({"nullness", "unused"})
  private PhoneNumber() {
    number = null;
  }

  public String getNumber() {
    return number;
  }

  @Override
  public boolean equals(@Nullable Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    PhoneNumber that = (PhoneNumber) o;

    if (!number.equals(that.number)) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode() {
    return number.hashCode();
  }

  @Override
  public int compareTo(PhoneNumber o) {
    return number.compareTo(o.number);
  }
}