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1   /*
2    * $Id: ClosingUIBean.java 651946 2008-04-27 13:41:38Z apetrelli $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  package org.apache.struts2.components;
23  
24  import java.io.Writer;
25  
26  import javax.servlet.http.HttpServletRequest;
27  import javax.servlet.http.HttpServletResponse;
28  
29  import org.apache.struts2.views.annotations.StrutsTagAttribute;
30  
31  import com.opensymphony.xwork2.util.ValueStack;
32  import com.opensymphony.xwork2.util.logging.Logger;
33  import com.opensymphony.xwork2.util.logging.LoggerFactory;
34  
35  /***
36   * ClosingUIBean is the standard superclass for UI components such as div etc.
37   */
38  public abstract class ClosingUIBean extends UIBean {
39      private static final Logger LOG = LoggerFactory.getLogger(ClosingUIBean.class);
40  
41      protected ClosingUIBean(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
42          super(stack, request, response);
43      }
44  
45      String openTemplate;
46  
47      public abstract String getDefaultOpenTemplate();
48  
49      @StrutsTagAttribute(description="Set template to use for opening the rendered html.")
50      public void setOpenTemplate(String openTemplate) {
51          this.openTemplate = openTemplate;
52      }
53  
54      public boolean start(Writer writer) {
55          boolean result = super.start(writer);
56          try {
57              evaluateParams();
58  
59              mergeTemplate(writer, buildTemplateName(openTemplate, getDefaultOpenTemplate()));
60          } catch (Exception e) {
61              LOG.error("Could not open template", e);
62              e.printStackTrace();
63          }
64  
65          return result;
66      }
67  }