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 }
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