WebLogic Server 6.1 API Reference

weblogic.apache.xpath.operations
Class UnaryOperation

java.lang.Object
  |
  +--weblogic.apache.xpath.Expression
        |
        +--weblogic.apache.xpath.operations.UnaryOperation

Direct Known Subclasses:

Bool, Neg, Number, String

public abstract class UnaryOperation

extends Expression

The unary operation base class.

This class is based on an implementation from the Apache XML Project. In future releases the XML parser, XSLT processor, and associated classes will likely be updated to be based on a later version of the Apache implementations. Since Apache does not guarantee backwards compatibility between versions of their software, we cannot guarantee backwards compatibility of any of the classes contained in the weblogic.apache package or sub-packages.

See Also:

Serialized Form

Field Summary

protected Expression

m_right The operand for the operation.

Fields inherited from class weblogic.apache.xpath.Expression

m_slocator

Constructor Summary

UnaryOperation()

Method Summary

boolean	canTraverseOutsideSubtree() Tell if this expression or it's subexpressions can traverse outside the current subtree.
XObject	execute(XPathContext xctxt) Execute the operand and apply the unary operation to the result.
abstract XObject	operate(XObject right) Apply the operation to two operands, and return the result.
void	setRight(Expression r) Set the expression operand for the operation.

Methods inherited from class weblogic.apache.xpath.Expression

assert, error, setSourceLocator, warn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_right

protected Expression m_right

The operand for the operation.

Constructor Detail

UnaryOperation

public UnaryOperation()

Method Detail

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()

Tell if this expression or it's subexpressions can traverse outside the current subtree.

Returns:

true if traversal outside the context node's subtree can occur.

Overrides:

canTraverseOutsideSubtree in class Expression

setRight

public void setRight(Expression r)

Set the expression operand for the operation.

Parameters:

r - The expression operand to which the unary operation will be applied.

execute

public XObject execute(XPathContext xctxt)
                throws javax.xml.transform.TransformerException

Execute the operand and apply the unary operation to the result.

Parameters:

xctxt - The runtime execution context.

Returns:

An XObject that represents the result of applying the unary operation to the evaluated operand.

Throws:

javax.xml.transform.TransformerException -

Overrides:

execute in class Expression

operate

public abstract XObject operate(XObject right)
                         throws javax.xml.transform.TransformerException

Apply the operation to two operands, and return the result.

Parameters:

right - non-null reference to the evaluated right operand.

Returns:

non-null reference to the XObject that represents the result of the operation.

Throws:

javax.xml.transform.TransformerException -