/**
 * Copyright 2009 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 org.waveprotocol.wave.client.editor.content;

import com.google.gwt.dom.client.Element;

/**
 * A renderer that produces no html implementation by design. Its purpose is to
 * be used with nodes that provide meta-information for a document (For example,
 * the click tracking on a button).
 *
 */
public class NullRenderer implements Renderer {

  /** Singleton instance */
  public static NullRenderer INSTANCE = new NullRenderer();

  @Override
  public Element createDomImpl(Renderable element) {
    return null;
  }

  // Singleton
  private NullRenderer() {
  }
}