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Java > Open Source Codes > com > jcorporate > expresso > ext > struts > taglib > html > ExImageTag


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64
65 package com.jcorporate.expresso.ext.struts.taglib.html;
66
67 import com.jcorporate.expresso.core.controller.ControllerElement;
68 import com.jcorporate.expresso.core.controller.Transition;
69 import com.jcorporate.expresso.core.misc.StringUtil;
70 import com.jcorporate.expresso.ext.struts.taglib.ControllerUtils;
71 import org.apache.struts.taglib.html.Constants;
72 import org.apache.struts.taglib.html.ImageTag;
73 import org.apache.struts.util.ResponseUtils;
74
75 import javax.servlet.http.HttpServletResponse JavaDoc;
76 import javax.servlet.jsp.JspException JavaDoc;
77 import java.util.Hashtable JavaDoc;
78
79
80 /**
81  * Tag for input fields of type "image".
82  *
83  * @author Oleg V Alexeev
84  */
85 public class ExImageTag
86         extends ImageTag {
87     protected String JavaDoc name = null;
88
89     /* The base Struts tag does not support the "name" attribute here */
90     public String JavaDoc getName() {
91         return (this.name);
92     }
93
94     public void setName(String JavaDoc name) {
95         this.name = name;
96     }
97
98     /**
99      * Process the start of this tag. Write the hidden fields for the parameters for this transition
100      *
101      * @return integer as defined in the standard tag library framework.
102      * @throws JspException if a JSP exception has occurred
103      */
104     public int doStartTag()
105             throws JspException JavaDoc {
106         Transition myTransition = null;
107         String JavaDoc nameToUse = name;
108         String JavaDoc propertyToUse = property;
109
110         if (StringUtil.notNull(nameToUse).equals(Constants.BEAN_KEY)) {
111             nameToUse = null;
112         }
113         if (nameToUse == null) {
114             myTransition = ControllerUtils.findTransition(pageContext,
115                     propertyToUse);
116         } else {
117             ControllerElement ce = ControllerUtils.findElement(pageContext,
118                     nameToUse,
119                     propertyToUse);
120
121             if (ce instanceof Transition) {
122                 myTransition = (Transition) ce;
123             } else {
124                 throw new JspException JavaDoc("Element '" + propertyToUse +
125                         "' in bean '" + nameToUse +
126                         "' is not a transition element - it is a '" +
127                         ce.getClass().getName() + "'");
128             }
129         }
130
131         Hashtable JavaDoc params = myTransition.getParams();
132
133         if (params != null) {
134
135             // Render this element to our writer
136 ResponseUtils.write(pageContext,
137                     myTransition.getHTMLParamString() + "\n");
138         }
139
140         this.text = null;
141
142         //return (EVAL_BODY_TAG);
143 return (EVAL_BODY_BUFFERED);
144     }
145
146     /**
147      * Process the end of this tag.
148      *
149      * @return integer as defined in the standard tag library framework.
150      * @throws JspException if a JSP exception has occurred
151      */
152     public int doEndTag()
153             throws JspException JavaDoc {
154         Transition myTransition = null;
155         String JavaDoc nameToUse = name;
156         String JavaDoc propertyToUse = property;
157
158         if (nameToUse == null) {
159             myTransition = ControllerUtils.findTransition(pageContext,
160                     propertyToUse);
161         } else {
162             ControllerElement ce = ControllerUtils.findElement(pageContext,
163                     nameToUse,
164                     propertyToUse);
165
166             if (ce instanceof Transition) {
167                 myTransition = (Transition) ce;
168             } else {
169                 throw new JspException JavaDoc("Element '" + propertyToUse +
170                         "' in bean '" + nameToUse +
171                         "' is not a transition element - it is a '" +
172                         ce.getClass().getName() + "'");
173             }
174         }
175
176         // Generate an HTML <input type="image"> element
177 HttpServletResponse JavaDoc response = (HttpServletResponse JavaDoc) pageContext.getResponse();
178         String JavaDoc tmp = null;
179         StringBuffer JavaDoc results = new StringBuffer JavaDoc();
180         results.append("<input type=\"image\" name=\"button_");
181         results.append(myTransition.getName());
182         results.append("\"");
183         tmp = src();
184
185         if (tmp != null) {
186             results.append(" SRC=\"");
187             results.append(response.encodeURL(tmp));
188             results.append("\"");
189         }
190
191         // tmp = alt(); Removed since Struts 1.1
192 tmp = null;
193
194         if (tmp != null) {
195             results.append(" alt=\"");
196             results.append(tmp);
197             results.append("\"");
198         }
199         if (border != null) {
200             results.append(" border=\"");
201             results.append(border);
202             results.append("\"");
203         }
204         if (value != null) {
205             results.append(" value=\"");
206             results.append(value);
207             results.append("\"");
208         }
209         if (accesskey != null) {
210             results.append(" accesskey=\"");
211             results.append(accesskey);
212             results.append("\"");
213         }
214         if (tabindex != null) {
215             results.append(" tabindex=\"");
216             results.append(tabindex);
217             results.append("\"");
218         }
219
220         results.append(prepareEventHandlers());
221         results.append(prepareStyles());
222         results.append(">");
223
224         // Render this element to our writer
225 ResponseUtils.write(pageContext, results.toString());
226
227         // Evaluate the remainder of this page
228 return (EVAL_PAGE);
229     }
230 }
231
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