Package net.sf.saxon.value
Class IntegerRange
- java.lang.Object
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- net.sf.saxon.value.Value
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- net.sf.saxon.value.IntegerRange
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- All Implemented Interfaces:
java.io.Serializable
,SequenceIterable
,GroundedValue
,ValueRepresentation
public class IntegerRange extends Value implements GroundedValue
This class represents a sequence of consecutive ascending integers, for example 1 to 50. The integers must be within the range of a Java long.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description long
end
long
start
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Fields inherited from class net.sf.saxon.value.Value
EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING
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Fields inherited from interface net.sf.saxon.om.ValueRepresentation
EMPTY_VALUE_ARRAY
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Constructor Summary
Constructors Constructor Description IntegerRange(long start, long end)
Construct an integer range expression
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getCardinality()
Determine the cardinalitylong
getEnd()
Get the last integer in the sequence (inclusive)ItemType
getItemType(TypeHierarchy th)
Determine the data type of the items in the expression, if possibleint
getLength()
Get the length of the sequencelong
getStart()
Get the first integer in the sequence (inclusive)Item
itemAt(int n)
Get the n'th item in the sequence (starting from 0).SequenceIterator
iterate()
Return an Iterator to iterate over the values of a sequence.GroundedValue
subsequence(int start, int length)
Get a subsequence of the value-
Methods inherited from class net.sf.saxon.value.Value
asItem, asItem, asIterator, asValue, checkPermittedContents, convertToJava, effectiveBooleanValue, equals, fromItem, getCanonicalLexicalRepresentation, getIterator, getSchemaComparable, getStringValue, getStringValueCS, iterate, makeQNameValue, process, reduce, stringToNumber, toString
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Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface net.sf.saxon.om.ValueRepresentation
getStringValue, getStringValueCS
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Method Detail
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getStart
public long getStart()
Get the first integer in the sequence (inclusive)- Returns:
- the first integer in the sequence (inclusive)
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getEnd
public long getEnd()
Get the last integer in the sequence (inclusive)- Returns:
- the last integer in the sequence (inclusive)
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iterate
public SequenceIterator iterate() throws XPathException
Return an Iterator to iterate over the values of a sequence. The value of every expression can be regarded as a sequence, so this method is supported for all expressions. This default implementation handles iteration for expressions that return singleton values: for non-singleton expressions, the subclass must provide its own implementation.- Specified by:
iterate
in classValue
- Returns:
- a SequenceIterator that can be used to iterate over the result of the expression
- Throws:
XPathException
- if any dynamic error occurs evaluating the expression
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getItemType
public ItemType getItemType(TypeHierarchy th)
Determine the data type of the items in the expression, if possible- Overrides:
getItemType
in classValue
- Parameters:
th
- the type hierarchy cache- Returns:
- AnyItemType (not known)
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getCardinality
public int getCardinality()
Determine the cardinality- Overrides:
getCardinality
in classValue
- Returns:
- the cardinality
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itemAt
public Item itemAt(int n)
Get the n'th item in the sequence (starting from 0). This is defined for all Values, but its real benefits come for a sequence Value stored extensionally (or for a MemoClosure, once all the values have been read)- Specified by:
itemAt
in interfaceGroundedValue
- Overrides:
itemAt
in classValue
- 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.
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subsequence
public GroundedValue subsequence(int start, int length)
Get a subsequence of the value- Specified by:
subsequence
in interfaceGroundedValue
- Parameters:
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 sequence- Returns:
- the required subsequence.
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getLength
public int getLength() throws XPathException
Get the length of the sequence- Overrides:
getLength
in classValue
- Returns:
- the number of items in the sequence
- Throws:
XPathException
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