net.sf.saxon.value
public final class EmptySequence extends Value implements GroundedValue
Method Summary | |
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Item | asItem()
Return the value in the form of an Item |
boolean | effectiveBooleanValue()
Get the effective boolean value - always false |
boolean | equals(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
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Returns: the value in the form of an Item
Throws: ClassCastException if the values are not comparable
Parameters: th the type hierarchy cache
Returns: always 0 for an empty sequence
Parameters: n position of the required item, counting from zero.
Returns: the n'th item in the sequence, where the first item in the sequence is numbered zero. If n is negative or >= the length of the sequence, returns null.
Parameters: 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 returned length 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
Returns: the required subsequence. If min is