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1 package freemarker.ext.jsp;
2
3 import java.lang.reflect.InvocationTargetException  ;
4 import java.lang.reflect.Method ;
5
6 import javax.servlet.jsp.PageContext ;
7
8 import freemarker.core.Environment;
9 import freemarker.template.TemplateModel;
10 import freemarker.template.TemplateModelException;
11 import freemarker.template.utility.UndeclaredThrowableException;
12
13
17 class PageContextFactory {
18
19 private static final Method constructor;
20
21 static {
22 Class impl;
23 try {
24 try {
25 PageContext .class.getMethod("getExpressionEvaluator", null);
26 impl = Class.forName("freemarker.ext.jsp.FreeMarkerPageContext2");
27 }
28 catch(NoSuchMethodException e) {
29 impl = Class.forName("freemarker.ext.jsp.FreeMarkerPageContext1");
30 }
31 constructor = impl.getDeclaredMethod("create", null);
32 }
33 catch(ClassNotFoundException e) {
34 throw new NoClassDefFoundError (e.getMessage());
35 }
36 catch(NoSuchMethodException e) {
37 throw new NoSuchMethodError (e.getMessage());
38 }
39 }
40
41 static FreeMarkerPageContext getCurrentPageContext() throws TemplateModelException {
42 Environment env = Environment.getCurrentEnvironment();
43 TemplateModel pageContextModel = env.getGlobalVariable(PageContext.PAGECONTEXT);
44 if(pageContextModel instanceof FreeMarkerPageContext) {
45 return (FreeMarkerPageContext)pageContextModel;
46 }
47 try {
48 FreeMarkerPageContext pageContext =
49 (FreeMarkerPageContext)constructor.invoke(null, null);
50 env.setGlobalVariable(PageContext.PAGECONTEXT, pageContext);
51 return pageContext;
52 }
53 catch(IllegalAccessException e) {
54 throw new IllegalAccessError (e.getMessage());
55 }
56 catch(InvocationTargetException e) {
57 if(e.getTargetException() instanceof TemplateModelException) {
58 throw (TemplateModelException)e.getTargetException();
59 }
60 throw new UndeclaredThrowableException(e);
61 }
62 }
63
64 }
65 |
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