com.saxonica.expr

Class PathFinder

java.lang.Object

com.saxonica.expr.PathFinder

All Implemented Interfaces:

Serializable, PatternFinder

public class PathFinder
extends Object
implements PatternFinder

This class enables a client to find all nodes in a document that match a particular pattern. In fact, it allows any subset of nodes in a document to be located. It is used specifically by the internal implementation of keys. In XSLT, the criterion for including nodes in a key is that they match an XSLT pattern. Internally, however, keys are used for a wider range of purposes, and the nodes indexed by the key are defined by a PatternFinder

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PathFinder(Expression path) Create a PathFinder that finds all the nodes returned by a particular expression when invoked with the document node as context node

Method Summary

Methods

Modifier and Type	Method and Description
Expression	getSelectionExpression() Get the underlying expression (usually a path expression or filter expression)
SequenceIterator	selectNodes(DocumentInfo doc, XPathContext context) Select nodes in a document using this PatternFinder.
String	toString() Get a string representation of the expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

PathFinder

public PathFinder(Expression path)

Create a PathFinder that finds all the nodes returned by a particular expression when invoked with the document node as context node

Parameters:

path - an expression designed to be evaluated with the document node of a tree as the context node, and which selects a set of nodes within the tree

Method Detail

selectNodes

public SequenceIterator selectNodes(DocumentInfo doc,
                           XPathContext context)
                             throws XPathException

Select nodes in a document using this PatternFinder.

Specified by:

selectNodes in interface PatternFinder

Parameters:

doc - the document node at the root of a tree

context - the dynamic evaluation context

Returns:

an iterator over the selected nodes in the document.

Throws:

XPathException - if a dynamic error is encountered

getSelectionExpression

public Expression getSelectionExpression()

Get the underlying expression (usually a path expression or filter expression)

Returns:

the underlying expression

toString

public String toString()

Get a string representation of the expression. Used in "explain" output

Overrides:

toString in class Object