The factory is not defined in the grammar files: it is a manually created class in our application. The factory has a method:

NotifyCondition createCondition(String condition)

which creates a notify condition object based on the condition string (e.g. “success” creates a SuccessNotifyCondition object). These *NotifyCondition classes are also a manually-created part of our application. You will need to adapt the example to suit you application!

NotifyConditionTreeParserTokenTypes.java
NotifyConditionTreeParserTokenTypes.txt are the files that it fails to create. The entire G file from the ttorial is

header {

}

class NotifyConditionLexer extends Lexer;

// Words, which include our operators
WORD: (’a’..’z’ | ‘A’..’Z’ | ‘.’)+ ;

// Grouping
LEFT_PAREN: ‘(’;
RIGHT_PAREN: ‘)’;

WHITESPACE
: (’ ‘) { $setType(Token.SKIP); }
;

class NotifyConditionParser extends Parser;

options {
buildAST=true;
}

orexpression
: andexpression (”or”^ andexpression)*
;

andexpression
: notexpression (”and”^ notexpression)*
;

notexpression
: (”not”^)? atom
;

atom
: condition
| LEFT_PAREN! orexpression RIGHT_PAREN!
;

condition
: “true”
| “false”
| “success”
| “failure”
| “error”
| “changed”
| “changed.by.me”
| “state.change”
;

class NotifyConditionTreeParser extends TreeParser;
{
private NotifyConditionFactory factory;

public void setNotifyConditionFactory(NotifyConditionFactory factory)
{
this.factory = factory;
}
}

cond
: #(”and” cond cond)
| #(”or” cond cond)
| #(”not” cond)
| condition
;

condition
: “true”
| “false”
| “success”
| “failure”
| “error”
| “changed”
| “changed.by.me”
| “state.change”
;