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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 }