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Java > Open Source Codes > com > jcorporate > expresso > ext > taglib > ExpressoLink


1 /* ====================================================================
2  * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
3  *
4  * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
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7  * modification, are permitted provided that the following conditions
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14  * notice, this list of conditions and the following disclaimer in
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19  * if any, must include the following acknowledgment:
20  * "This product includes software developed by Jcorporate Ltd.
21  * (http://www.jcorporate.com/)."
22  * Alternately, this acknowledgment may appear in the software itself,
23  * if and wherever such third-party acknowledgments normally appear.
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59  * <http://www.jcorporate.com/>.
60  *
61  * Portions of this software are based upon other open source
62  * products and are subject to their respective licenses.
63  */
64
65 package com.jcorporate.expresso.ext.taglib;
66
67 import com.jcorporate.expresso.core.controller.Transition;
68
69 import javax.servlet.http.HttpServletResponse JavaDoc;
70 import javax.servlet.jsp.JspException JavaDoc;
71 import javax.servlet.jsp.JspTagException JavaDoc;
72 import javax.servlet.jsp.JspWriter JavaDoc;
73 import javax.servlet.jsp.tagext.Tag JavaDoc;
74
75
76 /**
77  * Create an a href for an Expresso Transition
78  *
79  * @author Kris Thompson
80  */
81 public class ExpressoLink
82         extends ExpressoTagSupport {
83     private Transition oneTransition = null;
84     private java.lang.String JavaDoc name = null;
85     private java.lang.String JavaDoc value = null;
86     private java.lang.String JavaDoc nameToUse = null;
87     private java.lang.String JavaDoc valueToUse = null;
88     private java.lang.String JavaDoc classValue = null;
89     private String JavaDoc href = null;
90
91     /**
92      *
93      */
94     public ExpressoLink() {
95         super();
96     } /* ActionTag() */
97
98     /**
99      * Standard doEndTag.
100      *
101      * @return int
102      */
103     public int doStartTag()
104             throws javax.servlet.jsp.JspTagException JavaDoc {
105         nameToUse = name;
106         valueToUse = value;
107         getControllerResponse();
108
109         try {
110             Tag JavaDoc container = getContainer();
111
112             if (container == null) {
113                 oneTransition = ctlrResp.getTransition(nameToUse);
114             } else {
115                 if (container instanceof ElementIterator) {
116                     oneTransition = (Transition) ((ElementIterator) container).getElement();
117                     nameToUse = oneTransition.getName();
118                 } else if (container instanceof BlockTag) {
119                     oneTransition = (Transition) ((BlockTag) container).getBlock().getContent(getName());
120                 } else {
121                     throw new JspTagException JavaDoc("TransitionParamsTag: cannot handle container tag" +
122                             container.getClass().getName());
123                 }
124             }
125
126             JspWriter JavaDoc writer = pageContext.getOut();
127
128             if (oneTransition != null) {
129                 if (valueToUse == null || "".equals(valueToUse)) {
130
131                     //we need a value for the botton label. Lets try to get it
132 //from the Transition:
133 valueToUse = oneTransition.getLabel();
134                 }
135                 if (valueToUse == null || "".equals(valueToUse)) {
136
137                     //give it a default value
138 valueToUse = "Click";
139                 }
140
141                 //Add the hidden form field that contains the encoded button params
142 //Also, add a hidden form field with the "cmd=button" pair.
143 //This does not hurt to duplicate...
144 //writer.print(oneTransition.getParamString());
145 HttpServletResponse JavaDoc hr = (HttpServletResponse JavaDoc) pageContext.getResponse();
146                 StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
147                 if (getHref() != null) {
148                     buffer.append("<a HREF=");
149                     buffer.append(getHref());
150                     buffer.append(";jsessionid=" + pageContext.getSession().getId());
151                     buffer.append("?");
152                     buffer.append(oneTransition.getParamString());
153                     buffer.append(" class=");
154                     buffer.append(classValue);
155                     buffer.append(">");
156                     //System.out.println("The url is " + buffer.toString());
157 writer.print(buffer.toString());
158                 }
159             } else {
160                 writer.println("The Transition Button Could Not Be Displayed");
161             }
162         } catch (Exception JavaDoc e) {
163             throw new JspTagException JavaDoc("ActionParamsTag: " + e.getMessage());
164         }
165
166         return EVAL_PAGE;
167     } /* doEndTag() */
168
169
170     /* Render the end of the hyperlink.
171 *
172 * @exception JspException if a JSP exception has occurred
173 */
174     public int doEndTag() throws JspException JavaDoc {
175
176         try {
177 // Prepare the textual content and ending element of this hyperlink
178 StringBuffer JavaDoc results = new StringBuffer JavaDoc();
179             JspWriter JavaDoc writer = pageContext.getOut();
180             if (getHref() != null) {
181                 results.append("</a>");
182             }
183
184             writer.println(results.toString());
185         } catch (Exception JavaDoc e) {
186             throw new JspTagException JavaDoc("ActionParamsTag: " + e.getMessage());
187         }
188
189 // Evaluate the remainder of this page
190 return (EVAL_PAGE);
191
192     }
193
194
195     /**
196      * Setter method for Name.
197      *
198      * @return java.lang.String
199      */
200     public java.lang.String JavaDoc getName() {
201         return nameToUse;
202     } /* getName() */
203
204     /**
205      * Insert the method's description here.
206      * Creation date: (12/29/2000 %r)
207      *
208      * @return java.lang.String
209      */
210     public java.lang.String JavaDoc getValue() {
211         return valueToUse;
212     } /* getValue() */
213
214     /**
215      * Insert the method's description here.
216      * Creation date: (12/29/2000 %r)
217      *
218      * @param newName java.lang.String
219      */
220     public void setName(java.lang.String JavaDoc newName) {
221         name = newName;
222     } /* setName(java.lang.String) */
223
224     /**
225      * Insert the method's description here.
226      * Creation date: (12/29/2000 %r)
227      *
228      * @param newValue java.lang.String
229      */
230     public void setValue(java.lang.String JavaDoc newValue) {
231         value = newValue;
232     } /* setValue(java.lang.String) */
233
234
235     public void setHref(String JavaDoc href) {
236         this.href = href;
237     }
238
239     public String JavaDoc getHref() {
240         return this.href;
241     }
242
243     public void setClassValue(String JavaDoc classValue) {
244         this.classValue = classValue;
245     }
246
247     public String JavaDoc getClassValue() {
248         return this.classValue;
249     }
250
251 } /* ActionTag */
252
253 /* ActionTag */
254
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