com.icl.saxon.expr

Class ContextNodeExpression

public final class ContextNodeExpression extends SingletonExpression

This class represents the expression ".", which always returns the context node.
Method Summary
voiddisplay(int level)
Diagnostic print of expression structure
intgetDependencies()
Determine which aspects of the context the expression depends on.
NodeInfogetNode(Context context)
Return the node selected by this expression.
Expressionreduce(int dependencies, Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Method Detail

display

public void display(int level)
Diagnostic print of expression structure

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

getNode

public NodeInfo getNode(Context context)
Return the node selected by this expression.

Parameters: context The context for the evaluation

Returns: one NodeInfo only, namely the current node defined by the context

reduce

public Expression reduce(int dependencies, Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Parameters: dependencies The dependencies to be removed context The context to be used for the partial evaluation

Returns: a new expression that does not have any of the specified dependencies