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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.ContextItemExpression
This class represents the expression "(dot)", which always returns the context item. This may be a AtomicValue or a Node.
| Field Summary |
| 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 | |
ContextItemExpression()
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| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
int |
computeCardinality()
Get the static cardinality |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Item |
evaluateItem(XPathContext context)
Evaluate the expression |
int |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. |
ItemType |
getItemType()
Determine the item type |
int |
hashCode()
get HashCode for comparing two expressions |
SequenceIterator |
iterate(XPathContext context)
Iterate over the value of the expression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public ContextItemExpression()
| Method Detail |
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
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 ItemType getItemType()
public int computeCardinality()
computeCardinality in class ComputedExpressionpublic boolean equals(java.lang.Object other)
equals in class java.lang.Objectpublic int hashCode()
hashCode in class java.lang.Objectpublic int getIntrinsicDependencies()
ComputedExpression
getIntrinsicDependencies in class ComputedExpression
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressioncontext - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
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 void display(int level,
NamePool pool,
java.io.PrintStream out)
level - indentation level for this expressionpool - NamePool used to expand any names appearing in the expressionout - Output destination
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