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Library for validating XML documents with Schematron

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/**
 * Copyright (C) 2014-2020 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.helger.schematron.pure.model;

import javax.annotation.Nullable;

/**
 * Base interface for all elements that may have an ID.
 * IHasID<String> is not used here, because it requires an ID
 * to be present!
 *
 * @author Philip Helger
 */
public interface IPSHasID
{
  /**
   * Set an ID for this object.
   *
   * @param sID
   *        The ID to be set. May be null.
   */
  void setID (@Nullable String sID);

  /**
   * @return The optional ID of this element. May be null.
   */
  @Nullable
  String getID ();

  /**
   * @return true if an ID is present, false
   *         otherwise.
   */
  default boolean hasID ()
  {
    return getID () != null;
  }
}