/*
    * $Id: FreemarkerAutotagRuntime.java 1360343 2012-07-11 18:35:52Z 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.util.Map;
  
  import org.apache.tiles.autotag.core.runtime.ModelBody;
  import org.apache.tiles.autotag.core.runtime.AutotagRuntime;
  import org.apache.tiles.request.Request;
  import org.apache.tiles.request.freemarker.FreemarkerRequest;
  import org.apache.tiles.request.freemarker.FreemarkerRequestUtil;
  
  import freemarker.core.Environment;
  import freemarker.template.TemplateDirectiveBody;
  import freemarker.template.TemplateDirectiveModel;
  import freemarker.template.TemplateModel;
  
  /**
   * A Runtime for implementing a Freemarker Template Directive.   
   */
  public class FreemarkerAutotagRuntime implements AutotagRuntime<Request>, TemplateDirectiveModel {
  
      private Environment env;
      private TemplateDirectiveBody body;
      private Map<String, TemplateModel> params;
      
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      @Override
      public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) {
          this.env = env;
          this.body = body;
          this.params = params;
      }
  
      /** {@inheritDoc} */
      @Override
      public Request createRequest() {
          return FreemarkerRequest.createServletFreemarkerRequest(FreemarkerRequestUtil.getApplicationContext(env), env);
      }
  
      /** {@inheritDoc} */
      @Override
      public ModelBody createModelBody() {
          return new FreemarkerModelBody(env.getOut(), body);
      }
      
      /** {@inheritDoc} */
      @Override
      public <T> T getParameter(String name, Class<T> type, T defaultValue) {
          return FreemarkerUtil.getAsObject((TemplateModel)params.get(name), type, defaultValue);
      }
  }