Class DefaultExpressionVisitor

  • All Implemented Interfaces:
    Direct Known Subclasses:

    public abstract class DefaultExpressionVisitor
    extends Object
    implements ExpressionVisitor
    Abstract implementation of ExpressionVisitor that simply walks the data structure.

    This class implements the full ExpressionVisitor interface and will visit every Filter member of an Expression object. This class performs no actions and is not intended to be used directly, instead extend it and overide the methods for the Expression type you are interested in. Remember to call the super method if you want to ensure that the entire expression tree is still visited.

     FilterVisitor allProperties = new DefaultExpressionVisitor(){
         public Object visit( PropertyName expr, Object data ) {
             Set set = (Set) data;
             return set;
     Set set = (Set) allProperties.accept(allFids, new HashSet());