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17 package org.apache.portals.bridges.struts.taglib;
18
19 import javax.servlet.ServletRequest;
20 import javax.servlet.jsp.JspException;
21
22 import org.apache.portals.bridges.struts.PortletServlet;
23 import org.apache.portals.bridges.struts.config.PortletURLTypes;
24 import org.apache.strutsel.taglib.utils.EvalHelper;
25
26
27 /***
28 * Supports the Struts html-el:link tag to be used within a Portlet context.
29 *
30 * @author <a href="mailto:ate@douma.nu">Ate Douma</a>
31 * @version $Id: ELLinkTag.java 517068 2007-03-12 01:44:37Z ate $
32 */
33 public class ELLinkTag extends org.apache.strutsel.taglib.html.ELLinkTag
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 protected String calculateURL() throws JspException
111 {
112 if ( PortletServlet.isPortletRequest(pageContext.getRequest() ))
113 {
114 String url = super.calculateURL();
115
116
117 String anchor = null;
118 int hash = url.indexOf('#');
119 if ( hash > -1 )
120 {
121
122 anchor = url.substring(hash);
123 url = url.substring(0,hash);
124 }
125
126 url = TagsSupport.getURL(pageContext, url, urlType);
127
128 if ( anchor != null )
129 {
130 url = url + anchor;
131 }
132 return url;
133 }
134 else
135 {
136 return super.calculateURL();
137 }
138 }
139
140 public int doStartTag() throws JspException {
141 evaluateExpressions();
142 return(super.doStartTag());
143 }
144
145 /***
146 * Resolve the {@link #actionURL}, {@link #renderURL} and {@link #resourceURL} attributes
147 * using the Struts JSTL expression evaluation engine ({@link EvalHelper}).
148 * @exception JspException if a JSP exception has occurred
149 */
150 private void evaluateExpressions() throws JspException {
151 Boolean value;
152
153 value = EvalHelper.evalBoolean("actionURL", actionURL,this, pageContext);
154 if ( value != null && value.booleanValue() )
155 {
156 urlType = PortletURLTypes.URLType.ACTION;
157 }
158 if ( urlType == null )
159 {
160 value = EvalHelper.evalBoolean("renderURL", renderURL,this, pageContext);
161 if ( value != null && value.booleanValue() )
162 {
163 urlType = PortletURLTypes.URLType.RENDER;
164 }
165 }
166 if ( urlType == null )
167 {
168 value = EvalHelper.evalBoolean("resourceURL", resourceURL,this, pageContext);
169 if ( value != null && value.booleanValue() )
170 {
171 urlType = PortletURLTypes.URLType.RESOURCE;
172 }
173 }
174 }
175
176 public void release() {
177
178 super.release();
179 urlType = null;
180 actionURL = null;
181 renderURL = null;
182 resourceURL = null;
183 }
184 }