Package net.sf.saxon.pattern

Class AnyNodeTest

java.lang.Object

net.sf.saxon.pattern.NodeTest

net.sf.saxon.pattern.AnyNodeTest

All Implemented Interfaces:

QNameTest, ItemType, ItemType.WithSequenceTypeCache

public final class AnyNodeTest
extends NodeTest
implements QNameTest

NodeTest is an interface that enables a test of whether a node has a particular name and type. An AnyNodeTest matches any node.

Author:

Michael H. Kay

Nested Class Summary

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

ItemType.WithSequenceTypeCache

Method Summary

Modifier and Type	Method	Description
String	generateJavaScriptItemTypeTest(ItemType knownToBe, int targetVersion)	Generate Javascript code to test whether an item conforms to this item type
String	generateJavaScriptNameTest(int targetVersion)	Generate Javascript code to test if a name matches the test.
final double	getDefaultPriority()	Determine the default priority of this node test when used on its own as a Pattern
static AnyNodeTest	getInstance()	Get an instance of AnyNodeTest
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.
UType	getUType()	Get the corresponding UType.
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 this QNameTest matches a given QName
boolean	matchesNode(NodeInfo node)	Test whether this node test is satisfied by a given node.
String	toString()

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

copy, explainMismatch, generateJavaScriptItemTypeAcceptor, getAlphaCode, getAtomizedItemType, getContentType, getFingerprint, getGenre, getMatchingNodeName, getPrimitiveItemType, getPrimitiveType, getRequiredNodeNames, isAtomicType, isAtomizable, isNillable, isPlainType, matches, one, oneOrMore, toShortString, zeroOrMore, zeroOrOne

Methods inherited from class java.lang.Object

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

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

isTrueItemType, toExportString

Method Details

getInstance

public static AnyNodeTest getInstance()

Get an instance of AnyNodeTest

Returns:

the singleton instance of this class

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 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 this QNameTest matches a given QName

Specified by:

matches in interface QNameTest

Parameters:

qname - the QName to be matched

Returns:

true if the name matches, false if not

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

toString

public String toString()

Specified by:

toString in interface ItemType

Overrides:

toString in class Object

generateJavaScriptNameTest

public 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 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 - An item type that the supplied item is known to conform to; the generated code can assume that the item is an instance of this type.

targetVersion - The version of Saxon-JS for which code is being generated. Currently either 1 or 2.

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.