Beispiel #1
0
 @Override
 public ParseTree visitChildInternal(RelNode child, int ordinal) {
   final Convention convention = child.getConvention();
   if (!(child instanceof JavaRel)) {
     throw Util.newInternal(
         "Relational expression '"
             + child
             + "' has '"
             + convention
             + "' calling convention, so must implement interface "
             + JavaRel.class);
   }
   JavaRel javaRel = (JavaRel) child;
   final ParseTree p = javaRel.implement(this);
   if ((convention == CallingConvention.JAVA) && (p != null)) {
     throw Util.newInternal(
         "Relational expression '"
             + child
             + "' returned '"
             + p
             + " on implement, but should have "
             + "returned null, because it has JAVA calling-convention. "
             + "(Note that similar calling-conventions, such as "
             + "Iterator, must return a value.)");
   }
   return p;
 }
Beispiel #2
0
 private void bindDeferred(JavaFrame frame, final RelNode rel) {
   final StatementList statementList = getStatementList();
   if (frame.bind == null) {
     // this relational expression has not bound itself, so we presume
     // that we can call its implementSelf() method
     if (!(rel instanceof JavaSelfRel)) {
       throw Util.newInternal(
           "In order to bind-deferred, a "
               + "relational expression must implement JavaSelfRel: "
               + rel);
     }
     final JavaSelfRel selfRel = (JavaSelfRel) rel;
     LazyBind lazyBind =
         new LazyBind(
             newVariable(),
             statementList,
             getTypeFactory(),
             rel.getRowType(),
             new VariableInitializerThunk() {
               public VariableInitializer getInitializer() {
                 return selfRel.implementSelf(JavaRelImplementor.this);
               }
             });
     bind(rel, lazyBind);
   } else if ((frame.bind instanceof LazyBind)
       && (((LazyBind) frame.bind).statementList != statementList)) {
     // Frame is already bound, but to a variable declared in a different
     // scope. Re-bind it.
     final LazyBind lazyBind = (LazyBind) frame.bind;
     lazyBind.statementList = statementList;
     lazyBind.bound = false;
   }
 }
Beispiel #3
0
 private static int find(StatementList list, Statement statement) {
   if (statement == null) {
     return 0;
   } else {
     for (int i = 0, n = list.size(); i < n; i++) {
       if (list.get(i) == statement) {
         return i + 1;
       }
     }
     throw Util.newInternal("could not find statement " + statement + " in list " + list);
   }
 }