public class SingletonNode extends Value implements GroundedValue
Modifier and Type | Field and Description |
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protected NodeInfo |
node |
EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING
EMPTY_VALUE_ARRAY
Constructor and Description |
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SingletonNode(NodeInfo node)
Create a node-set containing zero or one nodes
|
Modifier and Type | Method and Description |
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Item |
asItem()
Return the value in the form of an Item
|
boolean |
effectiveBooleanValue()
Get the effective boolean value
|
int |
getCardinality()
Determine the static cardinality
|
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items in the expression.
|
int |
getLength()
Get the length of the sequence
|
NodeInfo |
getNode()
Get the node that forms the node-set.
|
java.lang.String |
getStringValue()
Convert the value to a string, using the serialization rules.
|
Item |
itemAt(int n)
Get the n'th item in the sequence (starting from 0).
|
SequenceIterator |
iterate()
Return an enumeration of this nodeset value.
|
void |
process(XPathContext context)
Process the instruction, without returning any tail calls
|
GroundedValue |
subsequence(int start,
int length)
Get a subsequence of the value
|
asItem, asIterator, asValue, checkPermittedContents, convertToJava, equals, fromItem, getCanonicalLexicalRepresentation, getIterator, getSchemaComparable, getStringValueCS, iterate, makeQNameValue, reduce, stringToNumber, toString
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
getStringValueCS
protected NodeInfo node
public SingletonNode(NodeInfo node)
node
- The node to be contained in the node-set, or null if the node-set
is to be emptypublic Item asItem()
public void process(XPathContext context) throws XPathException
process
in class Value
context
- The dynamic context, giving access to the current node,
the current variables, etc.XPathException
public ItemType getItemType(TypeHierarchy th)
getItemType
in class Value
th
- the type hierarchy cachepublic int getCardinality()
getCardinality
in class Value
public int getLength() throws XPathException
getLength
in class Value
XPathException
public Item itemAt(int n)
itemAt
in interface GroundedValue
itemAt
in class Value
n
- position of the required item, counting from zero.public GroundedValue subsequence(int start, int length)
subsequence
in interface GroundedValue
start
- the index of the first item to be included in the result, counting from zero.
A negative value is taken as zero. If the value is beyond the end of the sequence, an empty
sequence is returnedlength
- the number of items to be included in the result. Specify Integer.MAX_VALUE to
get the subsequence up to the end of the base sequence. If the value is negative, an empty sequence
is returned. If the value goes off the end of the sequence, the result returns items up to the end
of the sequencepublic NodeInfo getNode()
public SequenceIterator iterate()
public boolean effectiveBooleanValue()
effectiveBooleanValue
in class Value
public java.lang.String getStringValue()
getStringValue
in interface ValueRepresentation
getStringValue
in class Value