content: package act.view;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.Act;
  import act.app.ActionContext;
  import act.exception.ActException;
  import org.osgl.http.H;
  import org.osgl.util.E;
  import org.osgl.util.S;
  
  import java.util.Map;
  
  /**
   * Render a template with template path and arguments provided
   * by {@link ActionContext}
   */
  public class RenderTemplate extends RenderAny {
  
      public static RenderTemplate INSTANCE = new RenderTemplate() {
          @Override
          public H.Status status() {
              H.Status status = payload().status;
              return (null == status) ? super.status() : status;
          }
  
          @Override
          public long timestamp() {
              return payload().timestamp;
          }
      };
  
      static final ThreadLocal<Map<String, Object>> renderArgsBag = new ThreadLocal<>();
  
      private RenderTemplate() {
      }
  
      @Override
      public void apply(H.Request req, H.Response resp) {
          renderArgsBag.remove();
          throw E.unsupport("RenderTemplate does not support " +
                  "apply to request and response. Please use apply(AppContext) instead");
      }
  
      public void apply(ActionContext context) {
          Map<String, Object> renderArgs = renderArgsBag.get();
          if (null != renderArgs && !renderArgs.isEmpty()) {
              for (String key : renderArgs.keySet()) {
                  context.renderArg(key, renderArgs.get(key));
              }
          }
          ViewManager vm = Act.viewManager();
          Template t = vm.load(context);
          if (null == t) {
              throw new ActException("Render template[%s] not found", context.templatePath());
          }
          applyStatus(context.resp());
          H.Request req = context.req();
          H.Response resp = context.prepareRespForResultEvaluation();
          setContentType(req, resp, t);
          applyBeforeCommitHandler(req, resp);
          t.merge(context);
          applyAfterCommitHandler(req, resp);
      }
  
      protected void setContentType(H.Request req, H.Response resp, Template template) {
          H.Format fmt = req.accept();
          if (fmt == H.Format.UNKNOWN) {
              fmt = H.Format.HTML;
          }
          String s = fmt.contentType();
          String encoding = resp.characterEncoding();
          if(S.notBlank(encoding)) {
              s = S.concat(s, "; charset=", encoding);
          }
  
          resp.initContentType(s);
      }
  
      public static RenderTemplate get() {
          return INSTANCE;
      }
  
      public static RenderTemplate get(H.Status status) {
          touchPayload().status(status);
          return INSTANCE;
      }
  
      public static RenderTemplate of(Map<String, Object> args) {
          renderArgsBag.set(args);
          return INSTANCE;
      }
  
      public static RenderTemplate of(H.Status status, Map<String, Object> args) {
          touchPayload().status(status);
          renderArgsBag.set(args);
          return INSTANCE;
      }
  }
  