Class RslNode


  • public class RslNode
    extends AbstractRslNode
    This class represents a RSL parse tree. It is composed of variable definitions (bindings), relations, and sub-specifications (sub nodes).
    • Field Detail

      • _relations

        protected Map _relations
      • _bindings

        protected Map _bindings
    • Constructor Detail

      • RslNode

        public RslNode()
      • RslNode

        public RslNode​(int operator)
    • Method Detail

      • getParam

        public NameOpValue getParam​(String attribute)
        Returns the relation associated with the given attribute.
        Specified by:
        getParam in class AbstractRslNode
        Parameters:
        attribute - the attribute of the relation.
        Returns:
        the relation for the attribute. Null, if not found.
      • getBindings

        public Bindings getBindings​(String attribute)
        Returns the variable definitions associated wit the given attribute.
        Specified by:
        getBindings in class AbstractRslNode
        Parameters:
        attribute - the attribute of the variable deinitions.
        Returns:
        the variable deinitions for the attribute. Null, if not found.
      • removeParam

        public NameOpValue removeParam​(String attribute)
        Removes a relation for the specified attribute.
        Specified by:
        removeParam in class AbstractRslNode
        Parameters:
        attribute - the attribute name for the relation to remove.
        Returns:
        the relation that was removed.
      • removeBindings

        public Bindings removeBindings​(String attribute)
        Removes a bindings list for the specified attribute.
        Specified by:
        removeBindings in class AbstractRslNode
        Parameters:
        attribute - the attribute name for the bindings.
        Returns:
        the bindings that were removed.
      • getRelations

        public Map getRelations()
        Returns the relations.
        Returns:
        the map of relations.
      • getBindings

        public Map getBindings()
        Returns the variable definitions.
        Returns:
        the map of variable definitions.
      • evaluate

        public AbstractRslNode evaluate​(Map symbolTable)
                                 throws RslEvaluationException
        Evalutes the rsl tree against the specified symbol table. All the variable definitions are first evaluated because they might update the symbol table. Then all the relations followed by the sub-specifications are evaluated.
        Specified by:
        evaluate in class AbstractRslNode
        Parameters:
        symbolTable - the symbol table to evalute variables against.
        Returns:
        the evaluated rsl tree.
        Throws:
        RslEvaluationException - If an error occured during rsl evaluation.
      • toRSL

        public void toRSL​(StringBuffer buf,
                          boolean explicitConcat)
        Produces a RSL representation of node.
        Specified by:
        toRSL in class AbstractRslNode
        Parameters:
        buf - buffer to add the RSL representation to.
        explicitConcat - if true explicit concatination will be used in RSL strings.