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16 package org.apache.portals.bridges.struts.taglib;
17
18 import javax.servlet.ServletRequest;
19 import javax.servlet.jsp.JspException;
20 import javax.servlet.jsp.tagext.BodyContent;
21
22 import org.apache.portals.bridges.struts.PortletServlet;
23 import org.apache.portals.bridges.struts.config.PortletURLTypes;
24 import org.apache.struts.taglib.TagUtils;
25 import org.apache.strutsel.taglib.utils.EvalHelper;
26
27 /***
28 * Supports the Struts html-el:rewrite tag to be used within a Portlet context.
29 *
30 * @author <a href="mailto:ate@douma.nu">Ate Douma</a>
31 * @version $Id: ELRewriteTag.java 188237 2005-01-21 17:28:13 +0100 (Fri, 21 Jan 2005) ate $
32 */
33 public class ELRewriteTag extends org.apache.strutsel.taglib.html.ELRewriteTag
34 {
35 /***
36 * Indicates which type of a url must be generated: action, render or resource.
37 * <p>If not specified, the type will be determined by
38 * {@link PortletURLTypes#getType(String)}</p>.
39 */
40 protected PortletURLTypes.URLType urlType = null;
41
42 /***
43 * @return "true" if an ActionURL must be rendered
44 */
45 public String getActionURL()
46 {
47 return urlType != null && urlType.equals(PortletURLTypes.URLType.ACTION) ? "true" : "false";
48 }
49
50 private String actionURL;
51 /***
52 * Render an ActionURL when set to "true"
53 * <p>
54 * Supports jstl expression language.
55 * </p>
56 * @param actionURL when (evaluated to) "true" renders an ActionURL
57 */
58 public void setActionURL(String actionURL)
59 {
60
61 this.actionURL = actionURL;
62 }
63
64 public String getRenderURL()
65 {
66 return urlType != null && urlType.equals(PortletURLTypes.URLType.RENDER) ? "true" : "false";
67 }
68
69 private String renderURL;
70 /***
71 * Render a RenderURL when set to "true"
72 * <p>
73 * Supports jstl expression language.
74 * </p>
75 * @param renderURL when (evaluated to) "true" renders a RenderURL
76 */
77 public void setRenderURL(String renderURL)
78 {
79
80 this.renderURL = renderURL;
81 }
82
83 public String getResourceURL()
84 {
85 return urlType != null && urlType.equals(PortletURLTypes.URLType.RESOURCE) ? "true" : "false";
86 }
87
88 private String resourceURL;
89
90 /***
91 * Render a ResourceURL when set to "true"
92 * <p>
93 * Supports jstl expression language.
94 * </p>
95 * @param resourceURL when (evaluated to) "true" renders a ResourceURL
96 */
97 public void setResourceURL(String resourceURL)
98 {
99
100 this.resourceURL = resourceURL;
101 }
102
103 /***
104 * Generates a PortletURL or a ResourceURL for the link when in the context of a
105 * {@link PortletServlet#isPortletRequest(ServletRequest) PortletRequest}, otherwise
106 * the default behaviour is maintained.
107 * @return the link url
108 * @exception JspException if a JSP exception has occurred
109 */
110 public int doStartTag() throws JspException
111 {
112 evaluateExpressions();
113
114 if ( PortletServlet.isPortletRequest(pageContext.getRequest()))
115 {
116 String url = null;
117 BodyContent bodyContent = pageContext.pushBody();
118 try
119 {
120 super.doStartTag();
121 url = bodyContent.getString();
122
123
124 String anchor = null;
125 int hash = url.indexOf('#');
126 if ( hash > -1 )
127 {
128
129 anchor = url.substring(hash);
130 url = url.substring(0,hash);
131 }
132
133 url = TagsSupport.getURL(pageContext, url, urlType);
134
135 if ( anchor != null )
136 {
137 url = url + anchor;
138 }
139 }
140 finally
141 {
142 pageContext.popBody();
143 }
144 TagUtils.getInstance().write(pageContext, url);
145 return (SKIP_BODY);
146 }
147 else
148 {
149 return super.doStartTag();
150 }
151 }
152
153 /***
154 * Resolve the {@link #actionURL}, {@link #renderURL} and {@link #resourceURL} attributes
155 * using the Struts JSTL expression evaluation engine ({@link EvalHelper}).
156 * @exception JspException if a JSP exception has occurred
157 */
158 private void evaluateExpressions() throws JspException {
159 Boolean value;
160
161 value = EvalHelper.evalBoolean("actionURL", actionURL,this, pageContext);
162 if ( value != null && value.booleanValue() )
163 {
164 urlType = PortletURLTypes.URLType.ACTION;
165 }
166 if ( urlType == null )
167 {
168 value = EvalHelper.evalBoolean("renderURL", renderURL,this, pageContext);
169 if ( value != null && value.booleanValue() )
170 {
171 urlType = PortletURLTypes.URLType.RENDER;
172 }
173 }
174 if ( urlType == null )
175 {
176 value = EvalHelper.evalBoolean("resourceURL", resourceURL,this, pageContext);
177 if ( value != null && value.booleanValue() )
178 {
179 urlType = PortletURLTypes.URLType.RESOURCE;
180 }
181 }
182 }
183
184 public void release() {
185
186 super.release();
187 urlType = null;
188 actionURL = null;
189 renderURL = null;
190 resourceURL = null;
191 }
192 }