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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
net.sf.saxon.expr.CardinalityChecker
A CardinalityChecker implements the cardinality checking of "treat as": that is, it returns the supplied sequence, checking that its cardinality is correct
Field Summary |
Fields inherited from class net.sf.saxon.expr.UnaryExpression |
operand |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
CardinalityChecker(Expression sequence,
int cardinality,
RoleLocator role)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the expression |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
java.lang.String |
displayOperator(NamePool pool)
Diagnostic print of expression structure |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate as an Item. |
ItemType |
getItemType()
Determine the data type of the items returned by the expression, if possible |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
java.lang.Object |
map(Item item,
XPathContext context,
java.lang.Object info)
Mapping function |
void |
setErrorCode(java.lang.String code)
Set the error code to be returned (this is used when evaluating the functions such as exactly-one() which have their own error codes) |
Methods inherited from class net.sf.saxon.expr.UnaryExpression |
display, getBaseExpression, hashCode, iterateSubExpressions, promote, simplify |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public CardinalityChecker(Expression sequence, int cardinality, RoleLocator role)
Method Detail |
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
analyze
in interface Expression
analyze
in class UnaryExpression
XPathException
public void setErrorCode(java.lang.String code)
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.Object map(Item item, XPathContext context, java.lang.Object info) throws XPathException
map
in interface MappingFunction
item
- The item to be mapped.
If context is supplied, this must be the same as context.currentItem().context
- The processing context. This is supplied only for mapping constructs that
set the context node, position, and size. Otherwise it is null.info
- Arbitrary information supplied by the creator of the MappingIterator. It must be
read-only and immutable for the duration of the iteration.
XPathException
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic ItemType getItemType()
getItemType
in interface Expression
getItemType
in class UnaryExpression
public int computeCardinality()
computeCardinality
in class UnaryExpression
public int computeSpecialProperties()
computeSpecialProperties
in class UnaryExpression
public boolean equals(java.lang.Object other)
equals
in class UnaryExpression
public java.lang.String displayOperator(NamePool pool)
displayOperator
in class UnaryExpression
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