/* 
    * 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.esigate.extension.parallelesi;
  
  import java.io.IOException;
  import java.util.concurrent.Future;
  
  import org.esigate.HttpErrorPage;
  import org.esigate.parser.future.FutureElement;
  import org.esigate.parser.future.FutureParserContext;
  
  abstract class BaseElement implements FutureElement {
      private FutureElement parent = null;
  
      protected BaseElement() {
      }
  
      /**
       * Additional tag initialization callback.
       * 
       * @throws HttpErrorPage
       * @throws IOException
       * 
       **/
      protected boolean parseTag(Tag tag, FutureParserContext ctx) throws HttpErrorPage, IOException {
          // Default implementation does nothing
          return true;
      }
  
      @Override
      public boolean onTagStart(String tag, FutureParserContext ctx) throws IOException, HttpErrorPage {
          Tag tagObj = Tag.create(tag);
          this.parent = ctx.getCurrent();
          return parseTag(tagObj, ctx);
      }
  
      @Override
      public boolean onError(Exception e, FutureParserContext ctx) {
          return false;
      }
  
      @Override
      public void characters(Future<CharSequence> csq) throws IOException {
          this.parent.characters(csq);
      }
  
      @Override
      public FutureElement getParent() {
          return this.parent;
      }
  
  }