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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
net.sf.saxon.expr.NumericPromoter
A NumericPromoter performs numeric promotion on each item in a supplied sequence
| 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 | |
NumericPromoter(Expression sequence,
int requiredType)
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. |
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by the expression, if possible |
SequenceIterator |
iterate(XPathContext context)
Iterate over the sequence of values |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Optimize the expression |
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, promote, replaceSubExpression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public NumericPromoter(Expression sequence,
int requiredType)
sequence - this must be a sequence of atomic values. This is not checked; a ClassCastException
will occur if the precondition is not satisfied.requiredType - the item type to which all items in the sequence should be converted,
using the rules for "cast as".| Method Detail |
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 UnaryExpressionXPathException
public Expression optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
throws XPathException
optimize in interface Expressionoptimize in class UnaryExpressionopt - the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.env - the static context of the expressioncontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
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
expressionpublic 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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