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1
52
53 package freemarker.ext.servlet;
54
55 import javax.servlet.http.HttpServletRequest  ;
56 import javax.servlet.http.HttpServletResponse ;
57 import javax.servlet.http.HttpSession ;
58
59 import freemarker.template.ObjectWrapper;
60 import freemarker.template.TemplateHashModel;
61 import freemarker.template.TemplateModel;
62 import freemarker.template.TemplateModelException;
63
64
69
70 public final class HttpSessionHashModel
71 implements
72 TemplateHashModel
73 {
74 private HttpSession session;
75 private final ObjectWrapper wrapper;
76
77 private final FreemarkerServlet servlet;
79 private final HttpServletRequest request;
80 private final HttpServletResponse response;
81
82
87 public HttpSessionHashModel(HttpSession session, ObjectWrapper wrapper)
88 {
89 this.session = session;
90 this.wrapper = wrapper;
91
92 this.servlet = null;
93 this.request = null;
94 this.response = null;
95 }
96
97
108 public HttpSessionHashModel(FreemarkerServlet servlet, HttpServletRequest request, HttpServletResponse response, ObjectWrapper wrapper)
109 {
110 this.wrapper = wrapper;
111
112 this.servlet = servlet;
113 this.request = request;
114 this.response = response;
115 }
116
117 public TemplateModel get(String key) throws TemplateModelException
118 {
119 checkSessionExistence();
120 return wrapper.wrap(session != null ? session.getAttribute(key) : null);
121 }
122
123 private void checkSessionExistence() throws TemplateModelException
124 {
125 if(session == null) {
126 session = request.getSession(false);
127 if(session != null && servlet != null) {
128 try {
129 servlet.initializeSession(request, response);
130 }
131 catch(Exception e) {
132 throw new TemplateModelException(e);
133 }
134 }
135 }
136 }
137
138 public boolean isEmpty()
139 throws
140 TemplateModelException
141 {
142 checkSessionExistence();
143 return session == null || !session.getAttributeNames().hasMoreElements();
144 }
145 }
146 |
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