package freemarker.ext.jsp;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.servlet.jsp.PageContext;
import freemarker.core.Environment;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.utility.UndeclaredThrowableException;
/**
* @author Attila Szegedi
* @version $Id: PageContextFactory.java,v 1.2 2005/06/11 21:21:09 szegedia Exp $
*/
class PageContextFactory {
private static final Method constructor;
static {
Class impl;
try {
try {
PageContext.class.getMethod("getELContext", (Class[]) null);
impl = Class.forName("freemarker.ext.jsp.FreeMarkerPageContext21");
}
catch(NoSuchMethodException e1) {
try {
PageContext.class.getMethod("getExpressionEvaluator", (Class[]) null);
impl = Class.forName("freemarker.ext.jsp.FreeMarkerPageContext2");
}
catch(NoSuchMethodException e2) {
impl = Class.forName("freemarker.ext.jsp.FreeMarkerPageContext1");
}
}
constructor = impl.getDeclaredMethod("create", (Class[]) null);
}
catch(ClassNotFoundException e) {
throw new NoClassDefFoundError(e.getMessage());
}
catch(NoSuchMethodException e) {
throw new NoSuchMethodError(e.getMessage());
}
}
static FreeMarkerPageContext getCurrentPageContext() throws TemplateModelException {
Environment env = Environment.getCurrentEnvironment();
TemplateModel pageContextModel = env.getGlobalVariable(PageContext.PAGECONTEXT);
if(pageContextModel instanceof FreeMarkerPageContext) {
return (FreeMarkerPageContext)pageContextModel;
}
try {
FreeMarkerPageContext pageContext =
(FreeMarkerPageContext)constructor.invoke(null, (Object[]) null);
env.setGlobalVariable(PageContext.PAGECONTEXT, pageContext);
return pageContext;
}
catch(IllegalAccessException e) {
throw new IllegalAccessError(e.getMessage());
}
catch(InvocationTargetException e) {
if(e.getTargetException() instanceof TemplateModelException) {
throw (TemplateModelException)e.getTargetException();
}
throw new UndeclaredThrowableException(e);
}
}
}
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