/*
    * $Id: FreemarkerModelBody.java 1305546 2012-03-26 20:34:37Z nlebas $
    *
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.tiles.request.freemarker.autotag;
  
  import java.io.IOException;
  import java.io.Writer;
  
  import org.apache.tiles.autotag.core.runtime.AbstractModelBody;
  
  import freemarker.template.TemplateDirectiveBody;
  import freemarker.template.TemplateException;
  
  /**
   * Body implementation of a Freemarker model body.
   *
   * @version $Rev: 1305546 $ $Date: 2012-03-27 07:34:37 +1100 (Tue, 27 Mar 2012) $
   */
  public class FreemarkerModelBody extends AbstractModelBody {
  
      /**
       * The real body.
       */
      private TemplateDirectiveBody templateDirectiveBody;
  
      /**
       * Constructor.
       *
       * @param defaultWriter The default writer.
       * @param templateDirectiveBody The real body.
       */
      public FreemarkerModelBody(Writer defaultWriter, TemplateDirectiveBody templateDirectiveBody) {
          super(defaultWriter);
          this.templateDirectiveBody = templateDirectiveBody;
      }
  
      @Override
      public void evaluate(Writer writer) throws IOException {
          if (templateDirectiveBody == null) {
              return;
          }
  
          try {
              templateDirectiveBody.render(writer);
          } catch (TemplateException e) {
              throw new IOException("TemplateException when rendering body", e);
          }
      }
  
  }