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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.InstanceOfExpression
InstanceOf Expression: implements "Expr instance of data-type"
| 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 | |
InstanceOfExpression(Expression source,
SequenceType target)
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| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the cardinality |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
protected java.lang.String |
displayOperator(NamePool pool)
Give a string representation of the operator for use in diagnostics |
boolean |
effectiveBooleanValue(XPathContext context)
Evaluate the expression as a boolean |
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 InstanceOf expression |
| Methods inherited from class net.sf.saxon.expr.UnaryExpression |
computeSpecialProperties, getBaseExpression, hashCode, iterateSubExpressions, promote, simplify |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public InstanceOfExpression(Expression source,
SequenceType target)
| Method Detail |
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 int computeCardinality()
computeCardinality in class UnaryExpressionpublic ItemType getItemType()
getItemType in interface ExpressiongetItemType in class UnaryExpression
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
expression
public boolean effectiveBooleanValue(XPathContext context)
throws XPathException
effectiveBooleanValue in interface ExpressioneffectiveBooleanValue in class ComputedExpressioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expressionprotected java.lang.String displayOperator(NamePool pool)
displayOperator in class UnaryExpression
public void display(int level,
NamePool pool,
java.io.PrintStream out)
display in interface Expressiondisplay in class UnaryExpressionlevel - indentation level for this expressionpool - NamePool used to expand any names appearing in the expressionout - Output destination
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