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!
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