Class UnionExpr

java.lang.Object
org.exolab.adaptx.xpath.expressions.UnionExpr
All Implemented Interfaces:
MatchExpression, XPathExpression

public abstract class UnionExpr extends Object implements XPathExpression, MatchExpression
An abstract class that represents an XPath Union expression
 UnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
 
Version:
$Revision: 3734 $ $Date: 2003-05-13 09:55:04 +0200 (Tue, 13 May 2003) $
Author:
Keith Visco
  • Constructor Details

    • UnionExpr

      public UnionExpr()
  • Method Details

    • getPathExpr

      public abstract PathExpr getPathExpr()
      Returns the PathExpr of this UnionExpr. A UnionExpr is defined by XPath 1.0 as:
       UnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
       
      Returns:
      the PathExpr of this UnionExpr.
    • getUnionExpr

      public abstract UnionExpr getUnionExpr()
      Returns the UnionExpr that this UnionExpr is in union with. A UnionExpr is defined by XPath 1.0 as:
       UnionExpr ::= PathExpr | (PathExpr '|' UnionExpr)
       
      Returns:
      the UnionExpr that this UnionExpr is in union with, or null if this is UnionExpr only contains a PathExpr.
      See Also:
    • getExprType

      public final short getExprType()
      Returns the type of Expr this Expr represents
      Specified by:
      getExprType in interface XPathExpression
      Returns:
      the type of Expr this Expr represents
    • getMatchingExpr

      public PathExpr getMatchingExpr(XPathNode node, XPathContext context) throws XPathException
      Retrieves the PathExpr that matches the given node. If more than one PathExpr matches the given node, the most specific PathExpr will be returned.
      Parameters:
      node - the node to test for matching
      Returns:
      the matching PathExpr or null if none match
      Throws:
      XPathException
    • matches

      public abstract boolean matches(XPathNode node, XPathContext context) throws XPathException
      Determines if the given node is matched by this MatchExpr with respect to the given context.
      Specified by:
      matches in interface MatchExpression
      Parameters:
      node - the node to determine a match for
      context - the XPathContext
      Returns:
      true if the given node is matched by this MatchExpr
      Throws:
      XPathException - when an error occurs during evaluation