|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
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 |
Method Summary | |
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. |
int |
getImplementationMethod()
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). |
ItemType |
getItemType()
Determine the data type of the items returned by the expression, if possible |
int |
getRequiredCardinality()
Get the required cardinality |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
static ComputedExpression |
makeCardinalityChecker(Expression sequence,
int cardinality,
RoleLocator role)
Factory method to construct a CardinalityChecker. |
void |
process(XPathContext context)
Process the instruction, without returning any tail calls |
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) |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression |
Methods inherited from class net.sf.saxon.expr.UnaryExpression |
display, getBaseExpression, hashCode, iterateSubExpressions, optimize, promote, simplify |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
public static ComputedExpression makeCardinalityChecker(Expression sequence, int cardinality, RoleLocator role)
sequence
- cardinality
- role
-
public int getRequiredCardinality()
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException
typeCheck
in interface Expression
typeCheck
in class UnaryExpression
XPathException
public void setErrorCode(java.lang.String code)
public int getImplementationMethod()
getImplementationMethod
in interface Expression
getImplementationMethod
in class ComputedExpression
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 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 void process(XPathContext context) throws XPathException
process
in interface Expression
process
in class ComputedExpression
context
- The dynamic context, giving access to the current node,
the current variables, etc.
XPathException
public 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
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |