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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
net.sf.saxon.expr.ItemChecker
A ItemChecker implements the item type checking of "treat as": that is, it returns the supplied sequence, checking that all its items are of the correct type
| 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 | |
ItemChecker(Expression sequence,
ItemType itemType,
RoleLocator role)
Constructor |
|
| Method Summary | |
protected java.lang.String |
displayOperator(Configuration config)
Give a string representation of the operator for use in diagnostics |
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(TypeHierarchy th)
Determine the data type of the items returned by the expression |
ItemType |
getRequiredType()
Get the required type |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
void |
process(XPathContext context)
Process the instruction, without returning any tail calls |
Expression |
simplify(StaticContext env)
Simplify an expression |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
computeCardinality, computeSpecialProperties, display, getBaseExpression, hashCode, iterateSubExpressions, optimize, promote, replaceSubExpression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public ItemChecker(Expression sequence,
ItemType itemType,
RoleLocator role)
| Method Detail |
public ItemType getRequiredType()
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class UnaryExpressionXPathException
public Expression typeCheck(StaticContext env,
ItemType contextItemType)
throws XPathException
typeCheck in interface ExpressiontypeCheck in class UnaryExpressionXPathExceptionpublic int getImplementationMethod()
getImplementationMethod in interface ExpressiongetImplementationMethod in class ComputedExpression
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressioncontext - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public void process(XPathContext context)
throws XPathException
process in interface Expressionprocess in class ComputedExpressioncontext - The dynamic context, giving access to the current node,
the current variables, etc.
XPathExceptionpublic ItemType getItemType(TypeHierarchy th)
getItemType in interface ExpressiongetItemType in class UnaryExpressionth -
public boolean equals(java.lang.Object other)
equals in class UnaryExpressionprotected java.lang.String displayOperator(Configuration config)
displayOperator in class UnaryExpressionconfig -
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