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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.UnaryExpression | +--net.sf.saxon.expr.CastExpression
Cast Expression: implements "cast as data-type ( expression )". It also allows an internal cast, which has the same semantics as a user-requested cast, but maps an empty sequence to an empty 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 | |
CastExpression(Expression source,
AtomicType target,
boolean allowEmpty)
|
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Get the static cardinality of the expression |
protected java.lang.String |
displayOperator(NamePool pool)
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 the expression |
ItemType |
getItemType()
Get the static type of the expression |
Expression |
simplify(StaticContext env)
Simplify the expression |
Methods inherited from class net.sf.saxon.expr.UnaryExpression |
computeSpecialProperties, display, getBaseExpression, hashCode, iterateSubExpressions, promote |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public CastExpression(Expression source, AtomicType target, boolean allowEmpty)
Method Detail |
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class UnaryExpression
XPathException
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
analyze
in interface Expression
analyze
in class UnaryExpression
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 int computeCardinality()
computeCardinality
in class UnaryExpression
public ItemType getItemType()
getItemType
in interface Expression
getItemType
in class UnaryExpression
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 boolean equals(java.lang.Object other)
equals
in class UnaryExpression
protected java.lang.String displayOperator(NamePool pool)
displayOperator
in class UnaryExpression
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