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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.UnaryExpression
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+--net.sf.saxon.expr.CastableExpression
Castable Expression: implements "Expr castable as atomic-type?". The implementation simply wraps a cast expression with a try/catch.
| 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 | |
CastableExpression(Expression source,
AtomicType target,
boolean allowEmpty)
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| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality. |
protected java.lang.String |
displayOperator(NamePool pool)
Give a string representation of the operator for use in diagnostics |
boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value of the expression. |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate the expression |
ItemType |
getItemType()
Determine the data type of the result of the Castable 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 CastableExpression(Expression source,
AtomicType target,
boolean allowEmpty)
| Method Detail |
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class UnaryExpressionXPathException
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
analyze in interface Expressionanalyze in class UnaryExpressionenv - 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
XPathExceptionpublic boolean equals(java.lang.Object other)
equals in class UnaryExpressionpublic ItemType getItemType()
getItemType in interface ExpressiongetItemType in class UnaryExpressionpublic int computeCardinality()
UnaryExpression
computeCardinality in class UnaryExpressionpublic Item evaluateItem(XPathContext context)
evaluateItem in interface ExpressionevaluateItem in class ComputedExpressioncontext - The context in which the expression is to be evaluated
public boolean effectiveBooleanValue(XPathContext context)
ComputedExpression
effectiveBooleanValue in interface ExpressioneffectiveBooleanValue in class ComputedExpressioncontext - The context in which the expression is to be evaluated
protected java.lang.String displayOperator(NamePool pool)
displayOperator in class UnaryExpression
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