net.sf.saxon.pattern
Class EmptySequenceTest

java.lang.Object
  extended by net.sf.saxon.pattern.NodeTest
      extended by net.sf.saxon.pattern.EmptySequenceTest
All Implemented Interfaces:
Serializable, ItemType

public final class EmptySequenceTest
extends NodeTest

NodeTest is an interface that enables a test of whether a node has a particular name and type. An EmptySequenceTest matches no nodes or atomic values: it corresponds to the type empty-sequence().

Author:
Michael H. Kay
See Also:
Serialized Form

Method Summary
 double getDefaultPriority()
          Determine the default priority of this node test when used on its own as a Pattern
static EmptySequenceTest getInstance()
          Get a NoNodeTest instance
 int getNodeKindMask()
          Get a mask indicating which kinds of nodes this NodeTest can match.
 ItemType getPrimitiveItemType()
          Get the primitive item type corresponding to this item type.
 int getPrimitiveType()
          Get the basic kind of object that this ItemType matches: for a NodeTest, this is the kind of node, or Type.Node if it matches different kinds of nodes.
 int hashCode()
          Returns a hash code value for the object.
 boolean matches(int nodeType, int fingerprint, 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.
 boolean matchesItem(Item item, boolean allowURIPromotion, Configuration config)
          Test whether a given item conforms to this type
 String toString()
           
 
Methods inherited from class net.sf.saxon.pattern.NodeTest
getAtomizedItemType, getContentType, getFingerprint, getRequiredNodeNames, getSuperType, isAtomicType, isNillable, toString
 
Methods inherited from class java.lang.Object
equals, getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

getInstance

public static EmptySequenceTest getInstance()
Get a NoNodeTest instance


getPrimitiveType

public final int getPrimitiveType()
Description copied from class: NodeTest
Get the basic kind of object that this ItemType matches: for a NodeTest, this is the kind of node, or Type.Node if it matches different kinds of nodes.

Specified by:
getPrimitiveType in interface ItemType
Overrides:
getPrimitiveType in class NodeTest
Returns:
the node kind matched by this node test

getPrimitiveItemType

public ItemType getPrimitiveItemType()
Get the primitive item type corresponding to this item type. For item(), this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds, it is the value representing the node kind, for example Type.ELEMENT. For anyAtomicValue it is Type.ATOMIC_VALUE. For numeric it is Type.NUMBER. For other atomic types it is the primitive type as defined in XML Schema, except that INTEGER is considered to be a primitive type.

Specified by:
getPrimitiveItemType in interface ItemType
Overrides:
getPrimitiveItemType in class NodeTest

matchesItem

public boolean matchesItem(Item item,
                           boolean allowURIPromotion,
                           Configuration config)
Test whether a given item conforms to this type

Specified by:
matchesItem in interface ItemType
Overrides:
matchesItem in class NodeTest
Parameters:
item - The item to be tested
allowURIPromotion -
config -
Returns:
true if the item is an instance of this type; false otherwise

matches

public boolean matches(int nodeType,
                       int fingerprint,
                       int annotation)
Test whether this node test is satisfied by a given node

Specified by:
matches in class NodeTest
Parameters:
nodeType - The type of node to be matched
fingerprint - identifies the expanded name of the node to be matched
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

Specified by:
getDefaultPriority in class NodeTest

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

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


Copyright (C) Michael H. Kay. All rights reserved.