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1   /*
2    * $Id: ComponentTagSupport.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.views.jsp;
23  
24  import javax.servlet.http.HttpServletRequest;
25  import javax.servlet.http.HttpServletResponse;
26  import javax.servlet.jsp.JspException;
27  
28  import org.apache.struts2.components.Component;
29  import org.apache.struts2.dispatcher.Dispatcher;
30  
31  import com.opensymphony.xwork2.inject.Container;
32  import com.opensymphony.xwork2.util.ValueStack;
33  
34  /***
35   */
36  public abstract class ComponentTagSupport extends StrutsBodyTagSupport {
37      protected Component component;
38  
39      public abstract Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res);
40  
41      public int doEndTag() throws JspException {
42          component.end(pageContext.getOut(), getBody());
43          component = null;
44          return EVAL_PAGE;
45      }
46  
47      public int doStartTag() throws JspException {
48          component = getBean(getStack(), (HttpServletRequest) pageContext.getRequest(), (HttpServletResponse) pageContext.getResponse());
49          Container container = Dispatcher.getInstance().getContainer();
50          container.inject(component);
51          
52          populateParams();
53          boolean evalBody = component.start(pageContext.getOut());
54  
55          if (evalBody) {
56              return component.usesBody() ? EVAL_BODY_BUFFERED : EVAL_BODY_INCLUDE;
57          } else {
58              return SKIP_BODY;
59          }
60      }
61  
62      protected void populateParams() {
63      }
64  
65      public Component getComponent() {
66          return component;
67      }
68  }