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Google XML Pages (GXP) is a templating system used to generate XML/SGML markup (most often HTML).

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/*
 * Copyright (C) 2008 Google 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.google.gxp.compiler.parser;

import com.google.gxp.compiler.base.Node;

import java.util.*;

/**
 * A Null {@code ParsedElement}. Only inserted into the tree by
 * {@code IfExpander} when a out of place node is detected.  Ignored by
 * {@code Reparenter}.
 */
public class NullElement extends ParsedElement {
  public NullElement(Node node) {
    super(node.getSourcePosition(), node.getDisplayName(),
          Collections.emptyList(),
          Collections.emptyList());
  }

  public  T acceptVisitor(ParsedElementVisitor visitor) {
    return visitor.visitNullElement(this);
  }

  @Override
  protected ParsedElement withChildrenImpl(List children) {
    throw new UnsupportedOperationException();
  }
}