//flag for the existence of the var attribute
boolean hasVar = ctxt.isAttributeSpecified("var");
//temp name for exception and caught
String exceptionName = ctxt.getTemporaryVariableName();
String caughtName = ctxt.getTemporaryVariableName();
//main part to generate code
ctxt.generateJavaSource("boolean " + caughtName + " = false;");
ctxt.generateJavaSource("try{");
ctxt.generateBody();
ctxt.generateJavaSource("}");
//do catch
ctxt.generateJavaSource("catch(Throwable " + exceptionName + "){");
//if the var specified, the exception object should
//be set to the attribute "var" defines in page scope
if(hasVar){
String strVar = ctxt.getConstantAttribute("var");
ctxt.generateJavaSource(" pageContext.setAttribute(\"" + strVar + "\", "
+ exceptionName + ", PageContext.PAGE_SCOPE);");
}
//whenever there's exception caught,
//the flag caught should be set true;
ctxt.generateJavaSource(" " + caughtName + " = true;");
ctxt.generateJavaSource("}");
//do finally
ctxt.generateJavaSource("finally{");
//if var specified, the attribute it defines
//in page scope should be removed
if(hasVar){
String strVar = ctxt.getConstantAttribute("var");
ctxt.generateJavaSource(" if(!" + caughtName + "){");
ctxt.generateJavaSource(" pageContext.removeAttribute(\"" + strVar + "\", PageContext.PAGE_SCOPE);");
ctxt.generateJavaSource(" }");
}
ctxt.generateJavaSource("}");
