AbstractPQLQuery.java 文件源码

protected Set<PQLTask> interpretUnion(ParseTree tree) {
    Set<PQLTask> result = new HashSet<PQLTask>();

    for (int i = 0; i < tree.getChildCount(); i++) {
        ParseTree child = tree.getChild(i);

        if(child instanceof RuleNode) {
               int ruleIndex = ((RuleNode)child).getRuleContext().getRuleIndex();

               switch (ruleIndex) {
                case PQLParser.RULE_tasks:
                    result.addAll(interpretTasks(child));
                    break;
                case PQLParser.RULE_difference:
                    result.addAll(interpretDifference(child));
                    break;
                case PQLParser.RULE_intersection:
                    result.addAll(interpretIntersection(child));
                    break; 
               }
           }
       }

    return result;
}