net.sf.saxon.pattern

Class NameTest

java.lang.Object

net.sf.saxon.pattern.NodeTest

net.sf.saxon.pattern.NameTest

All Implemented Interfaces:

QNameTest, ItemType, ItemType.WithSequenceTypeCache

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. Note that unlike the XPath production called NameTest, this is a test for a specific name, and does not include wildcard matches.

Author:

Michael H. Kay

Nested Class Summary

Nested classes/interfaces inherited from interface net.sf.saxon.type.ItemType

ItemType.WithSequenceTypeCache

Constructor Summary

Constructors

Constructor and Description
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, java.lang.String uri, java.lang.String localName, NamePool namePool) Create a NameTest to match nodes by name

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other) Determines whether two NameTests are equal
java.util.Optional<java.lang.String>	explainMismatch(Item item, TypeHierarchy th) Get extra diagnostic information about why a supplied item does not conform to this item type, if available.
java.lang.String	generateJavaScriptItemTypeTest(ItemType knownToBe, int targetVersion) Generate Javascript code to test whether an item conforms to this item type
java.lang.String	generateJavaScriptNameTest(int targetVersion) Generate Javascript code to test if a name matches the test.
double	getDefaultPriority() Determine the default priority of this node test when used on its own as a Pattern
int	getFingerprint() Get the fingerprint required
java.lang.String	getLocalPart() Get the local name matched by this nametest
java.util.function.IntPredicate	getMatcher(NodeVectorTree tree) Get a matching function that can be used to test whether numbered nodes in a TinyTree or DominoTree satisfy the node test.
StructuredQName	getMatchingNodeName() Get the name of the nodes matched by this nodetest, if it matches a specific name.
NamePool	getNamePool() Get the NamePool associated with this NameTest
java.lang.String	getNamespaceURI() Get the namespace URI matched by this nametest
int	getNodeKind() Get the node kind that this name test matches
int	getPrimitiveType() Determine the types of nodes to which this pattern applies.
java.util.Optional<IntSet>	getRequiredNodeNames() Get the set of node names allowed by this NodeTest.
UType	getUType() Get the corresponding UType.
int	hashCode() Returns a hash code value for the object.
boolean	matches(int nodeKind, NodeName name, SchemaType annotation) Test whether this node test is satisfied by a given node.
boolean	matches(StructuredQName qname) Test whether the NameTest matches a given QName
boolean	matchesNode(NodeInfo node) Test whether this node test is satisfied by a given node.
java.lang.String	toShortString()
java.lang.String	toString()

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

copy, generateJavaScriptItemTypeAcceptor, getAlphaCode, getAtomizedItemType, getContentType, getGenre, getPrimitiveItemType, isAtomicType, isAtomizable, isNillable, isPlainType, matches, one, oneOrMore, zeroOrMore, zeroOrOne

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.type.ItemType

isTrueItemType, toExportString

Constructor Detail

NameTest

public NameTest(int nodeKind,
                java.lang.String uri,
                java.lang.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

Method Detail

getNamePool

public NamePool getNamePool()

Get the NamePool associated with this NameTest

Returns:

the NamePool

getNodeKind

public int getNodeKind()

Get the node kind that this name test matches

Returns:

the matching node kind

getUType

public UType getUType()

Get the corresponding UType. A UType is a union of primitive item types.

Specified by:

getUType in interface ItemType

Returns:

the smallest UType that subsumes this item type

matches

public boolean matches(int nodeKind,
                       NodeName name,
                       SchemaType 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

Returns:

true if the node matches this node test

getMatcher

public java.util.function.IntPredicate getMatcher(NodeVectorTree tree)

Description copied from class: NodeTest

Get a matching function that can be used to test whether numbered nodes in a TinyTree or DominoTree satisfy the node test. (Calling this matcher must give the same result as calling matchesNode(tree.getNode(nodeNr)), but it may well be faster).

Overrides:

getMatcher in class NodeTest

Parameters:

tree - the tree against which the returned function will operate

Returns:

an IntPredicate; the matches() method of this predicate takes a node number as input, and returns true if and only if the node identified by this node number matches the node test.

matchesNode

public boolean matchesNode(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:

matchesNode in class NodeTest

Parameters:

node - the node to be matched

Returns:

true if the node test is satisfied by the supplied node, false otherwise

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 class NodeTest

Returns:

the default priority for the pattern

getFingerprint

public int getFingerprint()

Get the fingerprint required

Overrides:

getFingerprint in class NodeTest

getMatchingNodeName

public StructuredQName getMatchingNodeName()

Get the name of the nodes matched by this nodetest, if it matches a specific name. Return null if the node test matches nodes of more than one name

Overrides:

getMatchingNodeName 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

getRequiredNodeNames

public java.util.Optional<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; or absent if the set of names cannot be represented (for example, with the name tests *:xxx or xxx:*)

getNamespaceURI

public java.lang.String getNamespaceURI()

Get the namespace URI matched by this nametest

Returns:

the namespace URI (using "" for the "null namepace")

getLocalPart

public java.lang.String getLocalPart()

Get the local name matched by this nametest

Returns:

the local name

toString

public java.lang.String toString()

Specified by:

toString in interface ItemType

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Determines whether two NameTests are equal

Overrides:

equals in class java.lang.Object

generateJavaScriptNameTest

public java.lang.String generateJavaScriptNameTest(int targetVersion)

Generate Javascript code to test if a name matches the test.

Specified by:

generateJavaScriptNameTest in interface QNameTest

Parameters:

targetVersion - the version of Saxon-JS being targeted

Returns:

JS code as a string. The generated code will be used as the body of a JS function in which the argument name "q" is an XdmQName object holding the name. The XdmQName object has properties uri and local.

generateJavaScriptItemTypeTest

public java.lang.String generateJavaScriptItemTypeTest(ItemType knownToBe,
                                                       int targetVersion)

Generate Javascript code to test whether an item conforms to this item type

Specified by:

generateJavaScriptItemTypeTest in interface ItemType

Parameters:

knownToBe - NodeTest that the item is known to conform to (no run-time test needed)

targetVersion - the version of Saxon-JS being targeted

Returns:

a Javascript instruction or sequence of instructions, which can be used as the body of a Javascript function, and which returns a boolean indication whether the value of the variable "item" is an instance of this item type.

explainMismatch

public java.util.Optional<java.lang.String> explainMismatch(Item item,
                                                            TypeHierarchy th)

Get extra diagnostic information about why a supplied item does not conform to this item type, if available. If extra information is returned, it should be in the form of a complete sentence, minus the closing full stop. No information should be returned for obvious cases.

Specified by:

explainMismatch in interface ItemType

Overrides:

explainMismatch in class NodeTest

Parameters:

item - the item that doesn't match this type

th - the type hierarchy cache

Returns:

optionally, a message explaining why the item does not match the type

toShortString

public java.lang.String toShortString()

Overrides:

toShortString in class NodeTest