com.icl.saxon.expr
Class NodeListExpression
java.lang.Object
|
+--com.icl.saxon.expr.Expression
|
+--com.icl.saxon.expr.NodeSetExpression
|
+--com.icl.saxon.expr.NodeListExpression
- public class NodeListExpression
- extends NodeSetExpression
A NodeListExpression is an expression denoting a set of nodes sorted in document order.
It is not possible to write a NodeListExpression directly using XPath; however a node set
expression is treated as a NodeListExpression when it appears in certain contexts, specifically
the select attribute of xsl:apply-templates or xsl:for-each.
Method Summary |
void |
display(int level)
Diagnostic print of expression structure |
NodeEnumeration |
enumerate(Context c,
boolean sort)
Return an enumeration that returns the nodes in document order |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
Expression |
reduce(int dependencies,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context. |
Expression |
simplify()
Simplify the expression |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NodeListExpression
public NodeListExpression(Expression exp)
- Constructor
- Parameters:
exp
- The expression that delivers the unsorted node-set
simplify
public Expression simplify()
throws XPathException
- Simplify the expression
- Overrides:
simplify
in class Expression
- Returns:
- the simplified expression
getDependencies
public int getDependencies()
- Determine which aspects of the context the expression depends on. The result is
a bitwise-or'ed value composed from constants such as Context.VARIABLES and
Context.CURRENT_NODE
- Overrides:
getDependencies
in class Expression
reduce
public Expression reduce(int dependencies,
Context context)
throws XPathException
- Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
- Overrides:
reduce
in class Expression
- Parameters:
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation- Returns:
- a new expression that does not have any of the specified
dependencies
enumerate
public NodeEnumeration enumerate(Context c,
boolean sort)
throws XPathException
- Return an enumeration that returns the nodes in document order
- Overrides:
enumerate
in class NodeSetExpression
- Parameters:
c
- the evaluation contextsort:
- ignored, this class is used because the enumeration is always in
document order
display
public void display(int level)
- Diagnostic print of expression structure
- Overrides:
display
in class Expression