ASTExprHelper.java 文件源码

protected static List<OnTriggerSetAssignment> getOnTriggerSetAssignments(EsperEPL2GrammarParser.OnSetAssignmentListContext ctx, Map<Tree, ExprNode> astExprNodeMap) {
    if (ctx == null || ctx.onSetAssignment().isEmpty()) {
        return Collections.emptyList();
    }
    List<EsperEPL2GrammarParser.OnSetAssignmentContext> ctxs = ctx.onSetAssignment();
    List<OnTriggerSetAssignment> assignments = new ArrayList<OnTriggerSetAssignment>(ctx.onSetAssignment().size());
    for (EsperEPL2GrammarParser.OnSetAssignmentContext assign : ctxs) {
        ExprNode childEvalNode;
        if (assign.eventProperty() != null) {
            ExprNode prop = ASTExprHelper.exprCollectSubNodes(assign.eventProperty(), 0, astExprNodeMap).get(0);
            ExprNode value = ASTExprHelper.exprCollectSubNodes(assign.expression(), 0, astExprNodeMap).get(0);
            ExprEqualsNode equals = new ExprEqualsNodeImpl(false, false);
            equals.addChildNode(prop);
            equals.addChildNode(value);
            childEvalNode = equals;
        } else {
            childEvalNode = ASTExprHelper.exprCollectSubNodes(assign, 0, astExprNodeMap).get(0);
        }
        assignments.add(new OnTriggerSetAssignment(childEvalNode));
    }
    return assignments;
}