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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
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 | |
int |
computeCardinality()
Determine the static cardinality. |
int |
computeSpecialProperties()
Determine the special properties of this expression |
protected java.lang.String |
displayOperator(Configuration config)
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(TypeHierarchy th)
Determine the data type of the result of the Castable expression |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Optimize the expression |
Expression |
simplify(StaticContext env)
Simplify the expression |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
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 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 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
XPathExceptionpublic boolean equals(java.lang.Object other)
equals in class UnaryExpressionpublic ItemType getItemType(TypeHierarchy th)
getItemType in interface ExpressiongetItemType in class UnaryExpressionth -
public int computeCardinality()
UnaryExpression
computeCardinality in class UnaryExpressionpublic int computeSpecialProperties()
computeSpecialProperties in class UnaryExpressionStaticProperty.NON_CREATIVE.public 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(Configuration config)
displayOperator in class UnaryExpressionconfig -
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