net.sf.saxon.pattern
Class NodeTestPattern

java.lang.Object
  net.sf.saxon.pattern.Pattern
      net.sf.saxon.pattern.NodeTestPattern

All Implemented Interfaces:

Serializable, SourceLocator, Container, PatternFinder

public class NodeTestPattern
extends Pattern

A NodeTestPattern is a pattern that consists simply of a NodeTest.

Author:

Michael H. Kay

See Also:

Serialized Form

Constructor Summary

NodeTestPattern()

NodeTestPattern(NodeTest test)

Method Summary

double	getDefaultPriority() Determine the default priority of this node test when used on its own as a Pattern
int	getFingerprint() Determine the name fingerprint of nodes to which this pattern applies.
int	getNodeKind() Determine the types of nodes to which this pattern applies.
NodeTest	getNodeTest() Get a NodeTest that all the nodes matching this pattern must satisfy
boolean	matches(NodeInfo node, XPathContext context) Determine whether this Pattern matches the given Node.
void	setNodeTest(NodeTest test)
String	toString() Display the pattern for diagnostics

Methods inherited from class net.sf.saxon.pattern.Pattern

analyze, getColumnNumber, getDependencies, getExecutable, getHostLanguage, getLineNumber, getLocationProvider, getPublicId, getSystemId, iterateSubExpressions, make, makeSearchExpression, promote, replaceSubExpression, selectNodes, setExecutable, setLineNumber, setOriginalText, setSystemId, simplify

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NodeTestPattern

public NodeTestPattern()

NodeTestPattern

public NodeTestPattern(NodeTest test)

Method Detail

setNodeTest

public void setNodeTest(NodeTest test)

matches

public boolean matches(NodeInfo node,
                       XPathContext context)

Determine whether this Pattern matches the given Node. This is the main external interface for matching patterns: it sets current() to the node being tested

Specified by:

matches in class Pattern

Parameters:

node - The NodeInfo representing the Element or other node to be tested against the Pattern

context - The context in which the match is to take place. Only relevant if the pattern uses variables, or contains calls on functions such as document() or key(). Not used (and can be set to null) in the case of patterns that are NodeTests

Returns:

true if the node matches the Pattern, false otherwise

getNodeTest

public NodeTest getNodeTest()

Get a NodeTest that all the nodes matching this pattern must satisfy

Specified by:

getNodeTest in class Pattern

Returns:

a NodeTest, as specific as possible, which all the matching nodes satisfy

getDefaultPriority

public final double getDefaultPriority()

Determine the default priority of this node test when used on its own as a Pattern

Overrides:

getDefaultPriority in class Pattern

Returns:

the default priority for the pattern

getNodeKind

public int getNodeKind()

Determine the types of nodes to which this pattern applies. Used for optimisation. For patterns that match nodes of several types, return Type.NODE

Overrides:

getNodeKind in class Pattern

Returns:

the type of node matched by this pattern. e.g. Type.ELEMENT or Type.TEXT

getFingerprint

public int getFingerprint()

Determine the name fingerprint of nodes to which this pattern applies. Used for optimisation.

Overrides:

getFingerprint in class Pattern

Returns:

A fingerprint that the nodes must match, or -1 if it can match multiple fingerprints

toString

public String toString()

Display the pattern for diagnostics

Overrides:

toString in class Pattern