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


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64
65 package com.jcorporate.expresso.ext.taglib;
66
67 import com.jcorporate.expresso.core.misc.StringUtil;
68 import org.apache.struts.taglib.bean.DefineTag;
69
70 import javax.servlet.jsp.JspException JavaDoc;
71 import javax.servlet.jsp.PageContext JavaDoc;
72
73
74 /**
75  * Define a scripting variable based on the value(s) of the specified
76  * bean property.
77  *
78  * @author Shash Chatterjee
79  */
80 public class ExSessionTag
81         extends DefineTag {
82     protected String JavaDoc db = null;
83     protected String JavaDoc dbToUse = null;
84
85     // --------------------------------------------------------- Public Methods
86 /**
87      * Retrieve the required property and expose it as a scripting variable.
88      *
89      * @return int as defined by the JSP taglib spec
90      * @throws JspException if a JSP exception has occurred
91      */
92     public int doStartTag()
93             throws JspException JavaDoc {
94
95         return (SKIP_BODY);
96     }
97
98     public String JavaDoc getDb() {
99         return (this.dbToUse);
100     }
101
102     public void setDb(String JavaDoc newDb) {
103         this.db = newDb;
104     }
105
106     /**
107      * Retrieve the required property and expose it as a scripting variable.
108      *
109      * @throws JspException if a JSP exception has occurred
110      */
111     public int doEndTag() throws JspException JavaDoc {
112
113         // Set the proper dbContext
114 dbToUse = db;
115
116         if ((this.dbToUse == null) || (this.dbToUse.equals(""))) {
117             this.dbToUse = "default";
118         }
119
120         // Retrieve the required property value
121 Object JavaDoc value = this.value;
122
123         if ((value == null) && (body != null)) {
124             // Allow body content to become the value if specified
125 value = body;
126         }
127         if (value == null) {
128
129             // Look up the requested value from session
130 value = pageContext.getRequest().getAttribute(property);
131         }
132         if (property.equals("db") && (value == null)) {
133             value = "default";
134         }
135         if (value == null) {
136             throw new JspException JavaDoc("Unable to find property '" +
137                     StringUtil.notNull(property) +
138                     "' in session");
139         }
140
141         // Expose this value as a scripting variable
142 int inScope = PageContext.PAGE_SCOPE;
143
144         if ("request".equals(toScope)) {
145             inScope = PageContext.REQUEST_SCOPE;
146         } else if ("session".equals(toScope)) {
147             inScope = PageContext.SESSION_SCOPE;
148         } else if ("application".equals(toScope)) {
149             inScope = PageContext.APPLICATION_SCOPE;
150         }
151
152         pageContext.setAttribute(id, value, inScope);
153
154
155         // Continue processing this page
156 return (EVAL_PAGE);
157
158     }
159 }
160
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