001/*
002 * Copyright 2012-2015 Institut National des Sciences Appliquées de Lyon (INSA-Lyon)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package gololang.ir;
018
019import static java.util.Objects.requireNonNull;
020
021/**
022 * Empty IR node.
023 */
024public final class Noop extends GoloStatement<Noop> implements ToplevelGoloElement {
025
026  private final String comment;
027
028  private Noop(String comment) {
029    this.comment = requireNonNull(comment);
030  }
031
032  public static Noop of(Object comment) {
033    return new Noop(comment == null ? "" : comment.toString());
034  }
035
036  protected Noop self() { return this; }
037
038  public String comment() {
039    return this.comment;
040  }
041
042  @Override
043  public void accept(GoloIrVisitor visitor) {
044    visitor.visitNoop(this);
045  }
046
047  @Override
048  public void replaceElement(GoloElement<?> original, GoloElement<?> newElement) {
049    throw cantReplace();
050  }
051}