I'm just starting to try and implement my own AssignmentHandler. Simple question on the existing implementation, ExpressionAssignmentHandler.
The code is:
public class ExpressionAssignmentHandler implements AssignmentHandler {
private static final long serialVersionUID = 1L;
protected String expression;
protected ExecutionContext executionContext = null;
protected ExpressionSession expressionSession = null;
protected TermTokenizer tokenizer;
protected Entity entity = null;
public void assign(Assignable assignable, ExecutionContext executionContext) {
try {
expressionSession = getExpressionSession();
if (expressionSession==null) {
throw new NullPointerException("getIdentitySession returned null");
}
this.tokenizer = new TermTokenizer(expression); // My Comment: how is expression set by here??
How does expression get set in this class?
The code in getExpressionSession() doesnt set it:
/**
* serves as a hook for customizing the way the identity session is retrieved.
* overload this method to reuse this expression assignment handler for your
* user data store.
*/
protected ExpressionSession getExpressionSession() {
JbpmContext jbpmContext = JbpmContext.getCurrentJbpmContext();
if (jbpmContext==null) {
throw new RuntimeException("no active JbpmContext for resolving assignment expression'"+expression+"'");
}
return new IdentitySession(jbpmContext.getSession());
}
...so what does? I'm sure I'm missing something simple, thanks!
PS: I need to implement AssignmentHandler from scratch and not extend ExpressionAssignmentHandler even though I am going to stay with expressions because I dont want to use jbpm User objects as I have my own User objects already.
Thanks!
