boolean hasVar, hasVarStatus, hasBegin, hasEnd, hasStep;
//init the flags
hasVar = ctxt.isAttributeSpecified("var");
hasVarStatus = ctxt.isAttributeSpecified("varStatus");
hasBegin = ctxt.isAttributeSpecified("begin");
hasEnd = ctxt.isAttributeSpecified("end");
hasStep = ctxt.isAttributeSpecified("step");
if(hasVarStatus){
ctxt.dontUseTagPlugin();
return;
}
//define all the temp variables' names
String itemsName = ctxt.getTemporaryVariableName();
String delimsName = ctxt.getTemporaryVariableName();
String stName = ctxt.getTemporaryVariableName();
String beginName = ctxt.getTemporaryVariableName();
String endName = ctxt.getTemporaryVariableName();
String stepName = ctxt.getTemporaryVariableName();
String index = ctxt.getTemporaryVariableName();
String temp = ctxt.getTemporaryVariableName();
String tokensCountName = ctxt.getTemporaryVariableName();
//get the value of the "items" attribute
ctxt.generateJavaSource("String " + itemsName + " = (String)");
ctxt.generateAttribute("items");
ctxt.generateJavaSource(";");
//get the value of the "delim" attribute
ctxt.generateJavaSource("String " + delimsName + " = (String)");
ctxt.generateAttribute("delims");
ctxt.generateJavaSource(";");
//new a StringTokenizer Object according to the "items" and the "delim"
ctxt.generateJavaSource("java.util.StringTokenizer " + stName + " = " +
"new java.util.StringTokenizer(" + itemsName + ", " + delimsName + ");");
//if "begin" specified, move the token to the "begin" place
//and record the begin index. default begin place is 0.
ctxt.generateJavaSource("int " + tokensCountName + " = " + stName + ".countTokens();");
if(hasBegin){
ctxt.generateJavaSource("int " + beginName + " = " );
ctxt.generateAttribute("begin");
ctxt.generateJavaSource(";");
ctxt.generateJavaSource("for(int " + index + " = 0; " + index + " < " + beginName + " && " + stName + ".hasMoreTokens(); " + index + "++, " + stName + ".nextToken()){}");
}else{
ctxt.generateJavaSource("int " + beginName + " = 0;");
}
//when "end" is specified, if the "end" is more than the last index,
//record the end place as the last index, otherwise, record it as "end";
//default end place is the last index
if(hasEnd){
ctxt.generateJavaSource("int " + endName + " = 0;" );
ctxt.generateJavaSource("if((" + tokensCountName + " - 1) < ");
ctxt.generateAttribute("end");
ctxt.generateJavaSource("){");
ctxt.generateJavaSource(" " + endName + " = " + tokensCountName + " - 1;");
ctxt.generateJavaSource("}else{");
ctxt.generateJavaSource(" " + endName + " = ");
ctxt.generateAttribute("end");
ctxt.generateJavaSource(";}");
}else{
ctxt.generateJavaSource("int " + endName + " = " + tokensCountName + " - 1;");
}
//get the step value from "step" if specified.
//default step value is 1.
if(hasStep){
ctxt.generateJavaSource("int " + stepName + " = " );
ctxt.generateAttribute("step");
ctxt.generateJavaSource(";");
}else{
ctxt.generateJavaSource("int " + stepName + " = 1;");
}
//the loop
ctxt.generateJavaSource("for(int " + index + " = " + beginName + "; " + index + " <= " + endName + "; " + index + "++){");
ctxt.generateJavaSource(" String " + temp + " = " + stName + ".nextToken();");
ctxt.generateJavaSource(" if(((" + index + " - " + beginName + ") % " + stepName + ") == 0){");
//if var specified, put the current token into the attribute "var" defines.
if(hasVar){
String strVar = ctxt.getConstantAttribute("var");
ctxt.generateJavaSource(" pageContext.setAttribute(\"" + strVar + "\", " + temp + ");");
}
ctxt.generateBody();
ctxt.generateJavaSource(" }");
ctxt.generateJavaSource("}");
