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Java > Open Source Codes > com > jcorporate > expresso > ext > struts > taglib > bean > ExDefineTag


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64
65 package com.jcorporate.expresso.ext.struts.taglib.bean;
66
67 import com.jcorporate.expresso.core.misc.StringUtil;
68 import com.jcorporate.expresso.ext.struts.taglib.ControllerUtils;
69 import org.apache.log4j.Logger;
70 import org.apache.struts.taglib.bean.DefineTag;
71
72 import javax.servlet.jsp.JspException JavaDoc;
73 import javax.servlet.jsp.PageContext JavaDoc;
74
75
76 /**
77  * Define a scripting variable based on the value(s) of the specified
78  * bean property.
79  *
80  * @author Craig R. McClanahan
81  */
82 public class ExDefineTag extends DefineTag {
83     private static final Logger log = Logger.getLogger(ExDefineTag.class);
84
85
86     // --------------------------------------------------------- Public Methods
87 /**
88      * Retrieve the required property and expose it as a scripting variable.
89      *
90      * @return integer as defined in the standard tag library framework.
91      * @throws JspException if a JSP exception has occurred
92      */
93     public int doStartTag() throws JspException JavaDoc {
94         // Retrieve the required property value
95 if (log.isDebugEnabled()) {
96             log.debug("******** ExDefineTag.doStartTag()");
97         }
98
99         return (EVAL_BODY_TAG);
100     }
101
102
103     /**
104      * Retrieve the required property and expose it as a scripting variable.
105      *
106      * @throws JspException if a JSP exception has occurred
107      */
108     public int doEndTag() throws JspException JavaDoc {
109
110         if (log.isDebugEnabled()) {
111             log.debug("******** ExDefineTag.doEndTag()");
112         }
113
114         Object JavaDoc value = this.value;
115
116         if ((value == null) && (body != null)) {
117             // Allow body content to become the value if specified
118 value = body;
119         }
120         if (value == null) {
121
122             // Look up the requested property value
123 value = ControllerUtils.getBeanProperty(pageContext, name,
124                     property, false);
125         }
126         if (value == null) {
127             throw new JspException JavaDoc("Unable to find property '" +
128                     StringUtil.notNull(property) +
129                     "' in bean '" + StringUtil.notNull(name) +
130                     "'");
131         }
132
133         // Expose this value as a scripting variable
134 int inScope = PageContext.PAGE_SCOPE;
135
136         if ("request".equals(toScope)) {
137             inScope = PageContext.REQUEST_SCOPE;
138         } else if ("session".equals(toScope)) {
139             inScope = PageContext.SESSION_SCOPE;
140         } else if ("application".equals(toScope)) {
141             inScope = PageContext.APPLICATION_SCOPE;
142         }
143
144         pageContext.setAttribute(id, value, inScope);
145         // Continue processing this page
146 return (EVAL_PAGE);
147
148     }
149
150 }
151
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