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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.UnaryExpression | +--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)
|
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 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 boolean equals(java.lang.Object other)
equals
in class UnaryExpression
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 effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue
in interface Expression
effectiveBooleanValue
in class ComputedExpression
context
- 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 Expression
display
in class UnaryExpression
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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