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java.lang.Object | +--net.sf.saxon.value.Value | +--net.sf.saxon.value.SequenceValue | +--net.sf.saxon.value.SequenceExtent
A sequence value implemented extensionally. That is, this class represents a sequence by allocating memory to each item in the sequence.
Field Summary |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
SequenceExtent(Item[] items)
Construct an sequence from an array of items. |
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SequenceExtent(java.util.List list)
Construct a SequenceExtent from a List. |
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SequenceExtent(SequenceExtent ext,
int start,
int length)
Construct a SequenceExtent as a view of another SequenceExtent |
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SequenceExtent(SequenceIterator iter)
Construct a sequence containing all the items in a SequenceIterator. |
Method Summary | |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value |
int |
getCardinality()
Determine the cardinality |
ItemType |
getItemType()
Get the (lowest common) item type |
int |
getLength()
Get the number of items in the sequence |
Item |
itemAt(int n)
Get the n'th item in the sequence (starting with 0 as the first item) |
SequenceIterator |
iterate(XPathContext context)
Return an iterator over this sequence. |
SequenceExtent |
materialize()
Materialize the SequenceValue as a SequenceExtent |
AxisIterator |
reverseIterate()
Return an enumeration of this sequence in reverse order (used for reverse axes) |
void |
swap(int a,
int b)
Swap two items (needed to support sorting) |
Methods inherited from class net.sf.saxon.value.SequenceValue |
convertToJava, display, equals, evaluateAsString, evaluateItem, getImplementationMethod, getStringValue, hashCode, 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 |
Constructor Detail |
public SequenceExtent(Item[] items)
items
- the array of items to be included in the sequencepublic SequenceExtent(SequenceExtent ext, int start, int length)
ext
- The existing SequenceExtentstart
- zero-based offset of the first item in the existing SequenceExtent
that is to be included in the new SequenceExtentlength
- The number of items in the new SequenceExtentpublic SequenceExtent(java.util.List list)
list
- the list of items to be included in the sequencepublic SequenceExtent(SequenceIterator iter) throws XPathException
iter
- The supplied sequence of items. This must be positioned at
the start, so that hasNext() returns true if there are any nodes in
the node-set, and next() returns the first node.
XPathException
- if reading the items using the
SequenceIterator raises an errorMethod Detail |
public SequenceExtent materialize() throws XPathException
materialize
in class SequenceValue
XPathException
public int getLength()
public int getCardinality()
getCardinality
in interface Expression
getCardinality
in class SequenceValue
Cardinality
public ItemType getItemType()
getItemType
in interface Expression
getItemType
in class SequenceValue
public Item itemAt(int n)
itemAt
in class SequenceValue
n
- the position of the required item
public void swap(int a, int b)
a
- the position of the first item to be swappedb
- the position of the second item to be swappedpublic SequenceIterator iterate(XPathContext context)
context
- dynamic evaluation context; not used in this
implementation of the method
public AxisIterator reverseIterate()
public boolean effectiveBooleanValue(XPathContext context)
effectiveBooleanValue
in interface Expression
effectiveBooleanValue
in class SequenceValue
context
- The context in which the expression is to be evaluated
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