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1   /*
2    * $Id: ComponentTagSupport.java 474191 2006-11-13 08:30:40Z mrdon $
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  package org.apache.struts2.views.jsp;
22  
23  import javax.servlet.http.HttpServletRequest;
24  import javax.servlet.http.HttpServletResponse;
25  import javax.servlet.jsp.JspException;
26  
27  import org.apache.struts2.components.Component;
28  import org.apache.struts2.dispatcher.Dispatcher;
29  import org.apache.struts2.dispatcher.mapper.ActionMapper;
30  
31  import com.opensymphony.xwork2.inject.Container;
32  import com.opensymphony.xwork2.inject.Inject;
33  import com.opensymphony.xwork2.util.ValueStack;
34  
35  /***
36   */
37  public abstract class ComponentTagSupport extends StrutsBodyTagSupport {
38      protected Component component;
39  
40      public abstract Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res);
41  
42      public int doEndTag() throws JspException {
43          component.end(pageContext.getOut(), getBody());
44          component = null;
45          return EVAL_PAGE;
46      }
47  
48      public int doStartTag() throws JspException {
49          component = getBean(getStack(), (HttpServletRequest) pageContext.getRequest(), (HttpServletResponse) pageContext.getResponse());
50          Container container = Dispatcher.getInstance().getContainer();
51          container.inject(component);
52          
53          populateParams();
54          boolean evalBody = component.start(pageContext.getOut());
55  
56          if (evalBody) {
57              return component.usesBody() ? EVAL_BODY_BUFFERED : EVAL_BODY_INCLUDE;
58          } else {
59              return SKIP_BODY;
60          }
61      }
62  
63      protected void populateParams() {
64          component.setId(id);
65      }
66  
67      public Component getComponent() {
68          return component;
69      }
70  }