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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.CastExpression
public final class 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 |
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Fields inherited from class net.sf.saxon.expr.ComputedExpression |
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lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
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CastExpression(Expression source,
AtomicType target)
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CastExpression(Expression source,
AtomicType target,
boolean allowEmpty)
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Method Summary | |
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Expression |
analyze(StaticContext env)
Type-check the expression |
int |
computeCardinality()
Get the static cardinality of the expression |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure |
Item |
evaluateItem(XPathContext context)
Evaluate the expression |
ItemType |
getItemType()
Get the static type of the expression |
Expression[] |
getSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify()
Simplify the expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
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computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CastExpression(Expression source, AtomicType target) throws XPathException
XPathException
public CastExpression(Expression source, AtomicType target, boolean allowEmpty) throws XPathException
XPathException
Method Detail |
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public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic Expression analyze(StaticContext env) throws XPathException
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException
- if any error is detectedpublic Expression[] getSubExpressions()
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public ItemType getItemType()
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 void display(int level, NamePool pool)
level
- indentation level for this expression
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