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1
28
29 package com.caucho.jsp.java;
30
31 import com.caucho.jsp.JspParseException;
32 import com.caucho.jsp.cfg.TldVariable;
33 import com.caucho.vfs.WriteStream;
34 import com.caucho.xml.QName;
35
36 import java.io.IOException  ;
37 import java.util.ArrayList ;
38
39
42 public class JspInvoke extends JspNode {
43 private static final QName FRAGMENT = new QName("fragment");
44 private static final QName VAR = new QName("var");
45 private static final QName SCOPE = new QName("scope");
46 private static final QName VAR_READER = new QName("varReader");
47
48 private String _name;
49 private String _var;
50 private String _varReader;
51 private String _scope;
52
53
56 public void addAttribute(QName name, String value)
57 throws JspParseException
58 {
59 if (FRAGMENT.equals(name))
60 _name = value;
61 else if (VAR.equals(name))
62 _var = value;
63 else if (VAR_READER.equals(name))
64 _varReader = value;
65 else if (SCOPE.equals(name))
66 _scope = value;
67 else
68 throw error(L.l("`{0}' is an unknown attribute for jsp:invoke.",
69 name.getName()));
70 }
71
72
75 public void endAttributes()
76 throws JspParseException
77 {
78 if (! _gen.getParseState().isTag())
79 throw error(L.l("`{0}' is only allowed in .tag files. Attribute directives are not allowed in normal JSP files.",
80 getTagName()));
81 }
82
83
86 public void endElement()
87 throws JspParseException
88 {
89 if (_name == null)
90 throw error(L.l("'fragment' is a required attribute of <jsp:invoke>."));
91
92 if (_scope != null && _var == null && _varReader == null)
93 throw error(L.l("'scope' requires a 'var' or a 'varReader' attribute for <jsp:invoke>."));
94
95 if (_var != null && _varReader != null)
96 throw error(L.l("jsp:invoke may not have both 'var' and 'varReader'"));
97 }
98
99
104 public void printXml(WriteStream os)
105 throws IOException
106 {
107 os.print("<jsp:invoke");
108
109 if (_name != null)
110 os.print(" name=\"" + _name + "\"");
111
112 if (_var != null)
113 os.print(" var=\"" + _var + "\"");
114
115 if (_varReader != null)
116 os.print(" varReader=\"" + _varReader + "\"");
117
118 if (_scope != null)
119 os.print(" scope=\"" + _scope + "\"");
120
121 os.print("/>");
122 }
123
124
127 public void generate(JspJavaWriter out)
128 throws Exception
129 {
130 String name = "_jsp_frag_" + _gen.uniqueId();
131
132 out.println("javax.servlet.jsp.tagext.JspFragment " + name + " = (javax.servlet.jsp.tagext.JspFragment) pageContext.getAttribute(\"" + _name + "\");");
133
134 out.println("if (" + name + " != null) {");
135 out.pushDepth();
136 JavaTagGenerator gen = (JavaTagGenerator) _gen;
137 ArrayList <TldVariable> vars = gen.getVariables();
138
139 for (int i = 0; i < vars.size(); i++) {
140 TldVariable var = vars.get(i);
141
142 if (var.getScope().equals("AT_END"))
143 continue;
144
145 String srcName = var.getNameGiven();
146 String dstName = srcName;
147
148 if (srcName == null) {
149 srcName = var.getAlias();
150 dstName = var.getNameFromAttribute();
151 dstName = "_jsp_var_from_attribute_" + i;
152 }
153 else
154 dstName = "\"" + dstName + "\"";
155
156 out.print("_jsp_parentContext.setAttribute(" + dstName + ", ");
157 out.println("pageContext.getAttribute(\"" + srcName + "\"));");
158 }
159
160
166
167 String context = null;
168 if (_scope == null || _scope.equals("page"))
169 context = "pageContext";
170 else if (_scope.equals("request"))
171 context = "pageContext.getRequest()";
172 else if (_scope.equals("session"))
173 context = "pageContext.getSessionScope()";
174 else if (_scope.equals("application"))
175 context = "pageContext.getApplication()";
176 else
177 throw error(L.l("Unknown scope `{0}' in <jsp:invoke>. Scope must be `page', `request', `session', or `application'.", _scope));
178
179
180 if (_var != null) {
181 out.print(context + ".setAttribute(\"" + _var + "\", ");
182 out.println("pageContext.invoke(" + name + "));");
183 }
184 else if (_varReader != null) {
185 out.print(context + ".setAttribute(\"" + _varReader + "\", ");
186 out.println("pageContext.invokeReader(" + name + "));");
187 }
188 else {
189 out.println(name + ".invoke(null);");
190 }
191
192 out.popDepth();
193 out.println("}");
194 }
195 }
196 |
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