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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.AxisExpression
An AxisExpression is always obtained by simplifying a PathExpression. It represents a PathExpression that starts at the context node, and uses a simple node-test with no filters. For example "*", "title", "./item", "@*", or "ancestor::chapter*".
An AxisExpression delivers nodes in axis order (not in document order). To get nodes in document order, in the case of a reverse axis, the expression should be wrapped in a Reverser.
| 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 | |
AxisExpression(byte axis,
NodeTest nodeTest)
Constructor |
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| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Specify that the expression returns a singleton |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
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? |
byte |
getAxis()
Get the axis |
int |
getIntrinsicDependencies()
Determine which aspects of the context the expression depends on. |
ItemType |
getItemType()
Determine the data type of the items returned by this expression |
NodeTest |
getNodeTest()
Get the NodeTest. |
int |
hashCode()
get HashCode for comparing two expressions |
SequenceIterator |
iterate(XPathContext context)
Evaluate the path-expression in a given context to return a NodeSet |
Expression |
simplify(StaticContext env)
Simplify an expression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public AxisExpression(byte axis,
NodeTest nodeTest)
axis - The axis to be used in this AxisExpression: relevant constants are defined
in class net.sf.saxon.om.Axis.nodeTest - The conditions to be satisfied by selected nodes. May be null,
indicating that any node on the axis is acceptableAxis| Method Detail |
public Expression simplify(StaticContext env)
simplify in interface Expressionsimplify in class ComputedExpression
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 boolean equals(java.lang.Object other)
equals in class java.lang.Objectpublic int hashCode()
hashCode in class java.lang.Objectpublic int getIntrinsicDependencies()
getIntrinsicDependencies in class ComputedExpressionpublic int computeSpecialProperties()
computeSpecialProperties in class ComputedExpressionpublic final ItemType getItemType()
public final int computeCardinality()
computeCardinality in class ComputedExpressionpublic byte getAxis()
public NodeTest getNodeTest()
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressioncontext - the evaluation context
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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