net.sf.joost.grammar.tree
Class PredicateTree

java.lang.Object
  net.sf.joost.grammar.Tree
      net.sf.joost.grammar.tree.PredicateTree

public final class PredicateTree

extends Tree

Objects of PredicateTree represent predicate nodes in the syntax tree of a pattern or an STXPath expression.

Version:

$Revision: 1.1 $ $Date: 2004/09/29 05:59:51 $

Author:

Oliver Becker

Field Summary

Fields inherited from class net.sf.joost.grammar.Tree

ADD, AND, ATTR, ATTR_LOCAL_WILDCARD, ATTR_URI_WILDCARD, ATTR_WILDCARD, AVT, CDATA_TEST, CHILD, COMMENT_TEST, DDOT, DESC, DIV, DOT, EQ, FUNCTION, GE, GT, LE, left, LIST, lName, LOCAL_WILDCARD, LT, MOD, MULT, NAME_TEST, NE, NODE_TEST, NUMBER, OR, PI_TEST, PREDICATE, right, ROOT, SEQ, STRING, SUB, TEXT_TEST, type, UNION, uri, URI_WILDCARD, value, VALUE, VAR, WILDCARD

Constructor Summary

PredicateTree(Tree left, Tree right)
Constructs a PredicateTree.

Method Summary

boolean

matches(Context context, int top, boolean setPosition) Determines if the event stack matches the pattern represented by this Tree object.

Methods inherited from class net.sf.joost.grammar.Tree

evaluate, evaluate, getPriority, reverseAssociativity, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PredicateTree

public PredicateTree(Tree left,
                     Tree right)

Constructs a PredicateTree.

Parameters:

left - the path before the predicate

right - the contents of the predicate

Method Detail

matches

public boolean matches(Context context,
                       int top,
                       boolean setPosition)
                throws SAXException

Description copied from class: Tree

Determines if the event stack matches the pattern represented by this Tree object.

Overrides:

matches in class Tree

Parameters:

context - the Context object

top - the part of the stack to be considered while matching (the upper most element is at position top-1)

setPosition - true if the context position (Context.position) should be set in case the event stack matches this pattern

Returns:

true if the stack matches the pattern represented by this Tree.

Throws:

SAXException