net.sf.saxon.pattern
Class NameTest

java.lang.Object
  net.sf.saxon.pattern.NodeTest
      net.sf.saxon.pattern.NameTest

All Implemented Interfaces:

Serializable, QNameTest, ItemType

public class NameTest
extends NodeTest
implements QNameTest

NodeTest is an interface that enables a test of whether a node has a particular name and type. A NameTest matches the node kind and the namespace URI and the local name.

Author:

Michael H. Kay

See Also:

Serialized Form

Constructor Summary

NameTest(int nodeKind, int nameCode, NamePool namePool)
Create a NameTest to match nodes by their nameCode allocated from the NamePool

NameTest(int nodeKind, NodeName name, NamePool pool)
Create a NameTest to match nodes by name

NameTest(int nodeKind, String uri, String localName, NamePool namePool)
Create a NameTest to match nodes by name

NameTest(NodeInfo node)
Create a NameTest for nodes of the same type and name as a given node

Method Summary

boolean	equals(Object other) Determines whether two NameTests are equal
double	getDefaultPriority() Determine the default priority of this node test when used on its own as a Pattern
int	getFingerprint() Get the fingerprint required
NamePool	getNamePool() Get the NamePool associated with this NameTest
int	getNodeKindMask() Get a mask indicating which kinds of nodes this NodeTest can match.
int	getPrimitiveType() Determine the types of nodes to which this pattern applies.
IntSet	getRequiredNodeNames() Get the set of node names allowed by this NodeTest.
ItemType	getSuperType(TypeHierarchy th) Get the type from which this item type is derived by restriction.
int	hashCode() Returns a hash code value for the object.
boolean	matches(int nodeKind, NodeName name, int annotation) Test whether this node test is satisfied by a given node.
boolean	matches(NodeInfo node) Test whether this node test is satisfied by a given node.
boolean	matches(StructuredQName qname) Test whether the NameTest matches a given QName
boolean	matches(TinyTree tree, int nodeNr) Test whether this node test is satisfied by a given node on a TinyTree.
String	toString()
String	toString(NamePool pool) Display the type descriptor for diagnostics

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

getAtomizedItemType, getContentType, getPrimitiveItemType, isAtomicType, isAtomizable, isNillable, isPlainType, matches, matchesItem, visitNamedSchemaComponents

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

NameTest

public NameTest(int nodeKind,
                String uri,
                String localName,
                NamePool namePool)

Create a NameTest to match nodes by name

Parameters:

nodeKind - the kind of node, for example Type.ELEMENT

uri - the namespace URI of the required nodes. Supply "" to match nodes that are in no namespace

localName - the local name of the required nodes. Supply "" to match unnamed nodes

namePool - the namePool holding the name codes

Since:

9.0

NameTest

public NameTest(int nodeKind,
                int nameCode,
                NamePool namePool)

Create a NameTest to match nodes by their nameCode allocated from the NamePool

Parameters:

nodeKind - the kind of node, for example Type.ELEMENT

nameCode - the nameCode representing the name of the node

namePool - the namePool holding the name codes

Since:

8.4

NameTest

public NameTest(int nodeKind,
                NodeName name,
                NamePool pool)

Create a NameTest to match nodes by name

Parameters:

nodeKind - the kind of node, for example Type.ELEMENT

name - the name of the nodes that this NameTest will match

pool - the namePool holding the name codes

Since:

9.4

NameTest

public NameTest(NodeInfo node)

Create a NameTest for nodes of the same type and name as a given node

Parameters:

node - the node whose node kind and node name will form the basis of the NameTest

Method Detail

getNamePool

public NamePool getNamePool()

Get the NamePool associated with this NameTest

Returns:

the NamePool

matches

public boolean matches(int nodeKind,
                       NodeName name,
                       int annotation)

Test whether this node test is satisfied by a given node. This method is only fully supported for a subset of NodeTests, because it doesn't provide all the information needed to evaluate all node tests. In particular (a) it can't be used to evaluate a node test of the form element(N,T) or schema-element(E) where it is necessary to know whether the node is nilled, and (b) it can't be used to evaluate a node test of the form document-node(element(X)). This in practice means that it is used (a) to evaluate the simple node tests found in the XPath 1.0 subset used in XML Schema, and (b) to evaluate node tests where the node kind is known to be an attribute.

Specified by:

matches in class NodeTest

Parameters:

nodeKind - The kind of node to be matched

name - identifies the expanded name of the node to be matched. The value should be null for a node with no name.

annotation - The actual content type of the node

matches

public boolean matches(TinyTree tree,
                       int nodeNr)

Test whether this node test is satisfied by a given node on a TinyTree. The node must be a document, element, text, comment, or processing instruction node. This method is provided so that when navigating a TinyTree a node can be rejected without actually instantiating a NodeInfo object.

Overrides:

matches in class NodeTest

Parameters:

tree - the TinyTree containing the node

nodeNr - the number of the node within the TinyTree

Returns:

true if the node matches the NodeTest, otherwise false

matches

public boolean matches(NodeInfo node)

Test whether this node test is satisfied by a given node. This alternative method is used in the case of nodes where calculating the fingerprint is expensive, for example DOM or JDOM nodes.

Overrides:

matches in class NodeTest

Parameters:

node - the node to be matched

matches

public boolean matches(StructuredQName qname)

Test whether the NameTest matches a given QName

Specified by:

matches in interface QNameTest

Parameters:

qname - the QName to be matched

Returns:

true if the name matches

getDefaultPriority

public final double getDefaultPriority()

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

Specified by:

getDefaultPriority in interface ItemType

Returns:

the default priority

getFingerprint

public int getFingerprint()

Get the fingerprint required

Overrides:

getFingerprint in class NodeTest

getPrimitiveType

public int getPrimitiveType()

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

Specified by:

getPrimitiveType in interface ItemType

Overrides:

getPrimitiveType in class NodeTest

Returns:

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

getSuperType

public ItemType getSuperType(TypeHierarchy th)

Get the type from which this item type is derived by restriction. This is the supertype in the XPath type heirarchy, as distinct from the Schema base type: this means that the supertype of xs:boolean is xs:anyAtomicType, whose supertype is item() (rather than xs:anySimpleType).

In fact the concept of "supertype" is not really well-defined, because the types form a lattice rather than a hierarchy. The only real requirement on this function is that it returns a type that strictly subsumes this type, ideally as narrowly as possible.

Specified by:

getSuperType in interface ItemType

Overrides:

getSuperType in class NodeTest

Parameters:

th - the type hierarchy cache

Returns:

the supertype, or null if this type is item()

getNodeKindMask

public int getNodeKindMask()

Get a mask indicating which kinds of nodes this NodeTest can match. This is a combination of bits: 1<

Overrides:

getNodeKindMask in class NodeTest

Returns:

a combination of bits: 1<

getRequiredNodeNames

public IntSet getRequiredNodeNames()

Get the set of node names allowed by this NodeTest. This is returned as a set of Integer fingerprints. A null value indicates that all names are permitted (i.e. that there are no constraints on the node name. The default implementation returns null.

Overrides:

getRequiredNodeNames in class NodeTest

Returns:

the set of integer fingerprints of the node names that this node test can match.

toString

public String toString()

Overrides:

toString in class Object

toString

public String toString(NamePool pool)

Description copied from class: NodeTest

Display the type descriptor for diagnostics

Specified by:

toString in interface ItemType

Overrides:

toString in class NodeTest

Parameters:

pool - the name pool

Returns:

a string representation of the type, in notation resembling but not necessarily identical to XPath syntax

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Determines whether two NameTests are equal

Overrides:

equals in class Object