com.icl.saxon.expr
Class ContextNodeExpression
java.lang.Object
   com.icl.saxon.expr.Expression
com.icl.saxon.expr.Expression
       com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.NodeSetExpression
           com.icl.saxon.expr.SingletonExpression
com.icl.saxon.expr.SingletonExpression
               com.icl.saxon.expr.ContextNodeExpression
com.icl.saxon.expr.ContextNodeExpression
- public final class ContextNodeExpression- extends SingletonExpression
This class represents the expression ".", which always returns the context node.
 
 
 
| Method Summary | 
|  void | display(int level)Diagnostic print of expression structure
 | 
|  int | getDependencies()Determine which aspects of the context the expression depends on.
 | 
|  NodeInfo | getNode(Context context)Return the node selected by this expression.
 | 
|  Expression | reduce(int dependencies,
       Context context)Perform a partial evaluation of the expression, by eliminating specified dependencies
 on the context.
 | 
 
 
 
 
| Methods inherited from class java.lang.Object | 
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
 
ContextNodeExpression
public ContextNodeExpression()
getNode
public NodeInfo getNode(Context context)
                 throws XPathException
- Return the node selected by this expression.
 
- 
- Specified by:
- getNodein class- SingletonExpression
 
- 
- Parameters:
- context- The context for the evaluation
- Returns:
- one NodeInfo only,
 namely the current node defined by the context
- Throws:
- XPathException
 
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
 
- 
- Specified by:
- getDependenciesin 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.
 
- 
- Specified by:
- reducein class- Expression
 
- 
- 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
- Throws:
- XPathException
 
display
public void display(int level)
- Diagnostic print of expression structure
 
- 
- Specified by:
- displayin class- Expression
 
-