public final class EmptySequence extends Value implements GroundedValue
INDETERMINATE_ORDERING
EMPTY_VALUE_ARRAY
Modifier and Type | Method and Description |
---|---|
Item |
asItem()
Return the value in the form of an Item
|
boolean |
effectiveBooleanValue()
Get the effective boolean value - always false
|
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression?
|
int |
getCardinality()
Determine the static cardinality
|
static EmptySequence |
getInstance()
Get the implicit instance of this class
|
ItemType |
getItemType(TypeHierarchy th)
Determine the item type
|
int |
getLength()
Get the length of the sequence
|
int |
hashCode() |
Item |
itemAt(int n)
Get the n'th item in the sequence (starting from 0).
|
SequenceIterator |
iterate()
Return an iteration over the sequence
|
GroundedValue |
subsequence(int min,
int length)
Get a subsequence of the value
|
asItem, asIterator, asValue, checkPermittedContents, convertToJava, fromItem, getCanonicalLexicalRepresentation, getIterator, getSchemaComparable, getStringValue, getStringValueCS, isIdentical, iterate, process, reduce
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
getStringValue, getStringValueCS
public static EmptySequence getInstance()
public SequenceIterator iterate()
public Item asItem()
public ItemType getItemType(TypeHierarchy th)
getItemType
in class Value
th
- the type hierarchy cachepublic int getCardinality()
getCardinality
in class Value
public final int getLength()
public boolean equals(java.lang.Object other)
public boolean effectiveBooleanValue()
effectiveBooleanValue
in class Value
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 min, int length)
subsequence
in interface GroundedValue
min
- 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 sequence