net.sf.saxon.pattern
Class ContentTypeTest

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

All Implemented Interfaces:

Serializable, ItemType

public class ContentTypeTest
extends NodeTest

NodeTest is an interface that enables a test of whether a node matches particular conditions. ContentTypeTest tests for an element or attribute node with a particular type annotation.

Author:

Michael H. Kay

See Also:

Serialized Form

Constructor Summary

ContentTypeTest(int nodeKind, SchemaType schemaType, Configuration config)
Create a ContentTypeTest

Method Summary

boolean	equals(Object other) Indicates whether some other object is "equal to" this one.
AtomicType	getAtomizedItemType() Get the item type of the atomic values that will be produced when an item of this type is atomized (assuming that atomization succeeds)
SchemaType	getContentType() Get the content type allowed by this NodeTest (that is, the type annotation of the matched nodes).
double	getDefaultPriority() Determine the default priority of this node test when used on its own as a Pattern
int	getNodeKind()
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.
SchemaType	getSchemaType()
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	isAtomizable() Ask whether values of this type are atomizable
boolean	isNillable() The test is nillable if a question mark was specified as the occurrence indicator
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(TinyTree tree, int nodeNr) Test whether this node test is satisfied by a given node on a TinyTree.
void	setNillable(boolean nillable) Indicate whether nilled elements should be matched (the default is false)
String	toString()
void	visitNamedSchemaComponents(SchemaComponentVisitor visitor) Visit all the schema components used in this ItemType definition

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

getFingerprint, getPrimitiveItemType, getRequiredNodeNames, isAtomicType, isPlainType, matches, matchesItem, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ContentTypeTest

public ContentTypeTest(int nodeKind,
                       SchemaType schemaType,
                       Configuration config)

Create a ContentTypeTest

Parameters:

nodeKind - the kind of nodes to be matched: always elements or attributes

schemaType - the required type annotation, as a simple or complex schema type

config - the Configuration, supplied because this KindTest needs access to schema information

Method Detail

setNillable

public void setNillable(boolean nillable)

Indicate whether nilled elements should be matched (the default is false)

Parameters:

nillable - true if nilled elements should be matched

isNillable

public boolean isNillable()

The test is nillable if a question mark was specified as the occurrence indicator

Overrides:

isNillable in class NodeTest

Returns:

true if the test is nillable

getSchemaType

public SchemaType getSchemaType()

getNodeKind

public int getNodeKind()

getSuperType

public ItemType getSuperType(TypeHierarchy th)

Description copied from class: NodeTest

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()

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

getDefaultPriority

public final double getDefaultPriority()

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

Returns:

the default priority

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

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<

getContentType

public SchemaType getContentType()

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

Overrides:

getContentType in class NodeTest

Returns:

the type annotation that all nodes matching this NodeTest must satisfy

getAtomizedItemType

public AtomicType getAtomizedItemType()

Get the item type of the atomic values that will be produced when an item of this type is atomized (assuming that atomization succeeds)

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

isAtomizable

public boolean isAtomizable()

Ask whether values of this type are atomizable

Specified by:

isAtomizable in interface ItemType

Overrides:

isAtomizable in class NodeTest

Returns:

true unless it is known that these items will be elements with element-only content, in which case return false

visitNamedSchemaComponents

public void visitNamedSchemaComponents(SchemaComponentVisitor visitor)
                                throws XPathException

Visit all the schema components used in this ItemType definition

Specified by:

visitNamedSchemaComponents in interface ItemType

Overrides:

visitNamedSchemaComponents in class NodeTest

Parameters:

visitor - the visitor class to be called when each component is visited

Throws:

XPathException - if an error occurs

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

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

Overrides:

equals in class Object