net.sf.saxon.value
Class SequenceIntent
java.lang.Object
|
+--net.sf.saxon.value.Value
|
+--net.sf.saxon.value.SequenceValue
|
+--net.sf.saxon.value.SequenceIntent
- All Implemented Interfaces:
- Expression, java.io.Serializable
- public class SequenceIntent
- extends SequenceValue
A SequenceIntent is sequence value that uses deferred evaluation. It
can be used as a value, but it is actually a wrapper around an iterator and
a context, so the items in the sequence are not evaluated until they are required.
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.value.SequenceValue |
convertToJava, display, effectiveBooleanValue, equals, evaluateAsString, evaluateItem, getCardinality, getImplementationMethod, getStringValue, hashCode, materialize, process |
Methods inherited from class net.sf.saxon.value.Value |
analyze, asItem, asValue, collapseWhitespace, convertJavaObjectToXPath, getDependencies, getParentExpression, getSpecialProperties, inverse, iterateSubExpressions, normalizeWhitespace, promote, simplify, stringToNumber, toString, trimWhitespace |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
SequenceIntent
public SequenceIntent(SequenceIterator iterator)
- Construct a SequenceIntent by supplying an iterator. Note that the caller must
ensure this is a "clean" iterator: it must be positioned at the start, and must
not be shared by anyone else. It is also required (at present) that the iterator
should return items in the correct sequence.
- Parameters:
iterator
- the iterator that delivers the items in the sequence. It must deliver
them in the correct order, with no duplicates.
getItemType
public ItemType getItemType()
- Get the item type
- Specified by:
getItemType
in interface Expression
- Overrides:
getItemType
in class SequenceValue
- Returns:
- AnyItemType (not known)
iterate
public SequenceIterator iterate(XPathContext context)
throws XPathException
- Evaluate the expression in a given context to return a sequence
- Parameters:
context
- the evaluation context.
- 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
itemAt
public Item itemAt(int n)
throws XPathException
- Get the n'th item in the sequence (starting from 0). This is defined for all
SequenceValues, but its real benefits come for a SequenceValue stored extensionally
- Overrides:
itemAt
in class SequenceValue
XPathException