net.sf.saxon.pattern

Class NodeKindTest

java.lang.Object

net.sf.saxon.pattern.NodeTest

net.sf.saxon.pattern.NodeKindTest

All Implemented Interfaces:

ItemType, ItemType.WithSequenceTypeCache

public class NodeKindTest
extends NodeTest

NodeTest is an interface that enables a test of whether a node has a particular name and kind. A NodeKindTest matches the node kind only.

Author:

Michael H. Kay

Nested Class Summary

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

ItemType.WithSequenceTypeCache

Field Summary

Fields

Modifier and Type	Field and Description
static NodeKindTest	ATTRIBUTE
static NodeKindTest	COMMENT
static NodeKindTest	DOCUMENT
static NodeKindTest	ELEMENT
static NodeKindTest	NAMESPACE
static NodeKindTest	PROCESSING_INSTRUCTION
static NodeKindTest	TEXT

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other) Indicates whether some other object is "equal to" this one.
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
AtomicType	getAtomizedItemType() Get the content type allowed by this NodeTest (that is, the type annotation).
SchemaType	getContentType() Get the content type allowed by this NodeTest (that is, the type of content allowed).
double	getDefaultPriority() Determine the default priority of this node test when used on its own as a Pattern
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.
int	getNodeKind() Get the node kind matched by this test
int	getPrimitiveType() Determine the types of nodes to which this pattern applies.
UType	getUType() Get the corresponding UType.
int	hashCode() Returns a hash code value for the object.
static NodeTest	makeNodeKindTest(int kind) Make a test for a given kind of node
boolean	matches(int nodeKind, NodeName name, SchemaType annotation) Test whether this node test is satisfied by a given node.
boolean	matches(Item item, TypeHierarchy th) Test whether a given item conforms to this type
boolean	matchesNode(NodeInfo node) Test whether this node test is satisfied by a given node.
static java.lang.String	nodeKindName(int kind) Get the name of a node kind
java.lang.String	toShortString()
java.lang.String	toString()
static java.lang.String	toString(int kind)

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

copy, generateJavaScriptItemTypeAcceptor, getAlphaCode, getFingerprint, getGenre, getMatchingNodeName, getPrimitiveItemType, getRequiredNodeNames, isAtomicType, isAtomizable, isNillable, isPlainType, 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

Field Detail

DOCUMENT

public static final NodeKindTest DOCUMENT

ELEMENT

public static final NodeKindTest ELEMENT

ATTRIBUTE

public static final NodeKindTest ATTRIBUTE

TEXT

public static final NodeKindTest TEXT

COMMENT

public static final NodeKindTest COMMENT

PROCESSING_INSTRUCTION

public static final NodeKindTest PROCESSING_INSTRUCTION

NAMESPACE

public static final NodeKindTest NAMESPACE

Method Detail

getNodeKind

public int getNodeKind()

Get the node kind matched by this test

Returns:

the matching node kind

getUType

public UType getUType()

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

Returns:

the smallest UType that subsumes this item type

makeNodeKindTest

public static NodeTest makeNodeKindTest(int kind)

Make a test for a given kind of node

matches

public boolean matches(Item item,
                       TypeHierarchy th)

Description copied from interface: ItemType

Test whether a given item conforms to this type

Specified by:

matches in interface ItemType

Overrides:

matches in class NodeTest

Parameters:

item - The item to be tested

th - The type hierarchy cache. Currently used only when matching function items.

Returns:

true if the item is an instance of this type; false otherwise

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

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

getPrimitiveType

public int getPrimitiveType()

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

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

getContentType

public SchemaType getContentType()

Get the content type allowed by this NodeTest (that is, the type of content allowed). Return AnyType if there are no restrictions.

Overrides:

getContentType in class NodeTest

Returns:

the type annotation that all nodes matching this NodeTest must satisfy

getAtomizedItemType

public AtomicType getAtomizedItemType()

Get the content type allowed by this NodeTest (that is, the type annotation). Return AnyType if there are no restrictions. The default implementation returns AnyType.

Specified by:

getAtomizedItemType in interface ItemType

Overrides:

getAtomizedItemType in class NodeTest

Returns:

the best available item type of the atomic values that will be produced when an item of this type is atomized, or null if it is known that atomization will throw an error.

toString

public java.lang.String toString()

Specified by:

toString in interface ItemType

Overrides:

toString in class java.lang.Object

toString

public static java.lang.String toString(int kind)

nodeKindName

public static java.lang.String nodeKindName(int kind)

Get the name of a node kind

Parameters:

kind - the node kind, for example Type.ELEMENT or Type.ATTRIBUTE

Returns:

the name of the node kind, for example "element" or "attribute"

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)

Indicates whether some other object is "equal to" this one.

Overrides:

equals in class java.lang.Object

generateJavaScriptItemTypeTest

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

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

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.

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