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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
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 |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
AxisExpression(byte axis,
NodeTest nodeTest)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env)
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)
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()
Simplify an expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getLineNumber, getSpecialProperties, getSubExpressions, markTailFunctionCalls, promote, setLineNumber, typeError |
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()
simplify
in interface Expression
simplify
in class ComputedExpression
public Expression analyze(StaticContext env) throws XPathException
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public boolean equals(java.lang.Object other)
public int hashCode()
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class ComputedExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public final ItemType getItemType()
public final int computeCardinality()
computeCardinality
in class ComputedExpression
public byte getAxis()
public NodeTest getNodeTest()
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- the evaluation context
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void display(int level, NamePool pool)
level
- indentation level for this expression
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