org.apache.xpath.operations
Class UnaryOperation
java.lang.Object
|
+--org.apache.xpath.Expression
|
+--org.apache.xpath.operations.UnaryOperation
- Direct Known Subclasses:
- Bool, Neg, Number, String
- public abstract class UnaryOperation
- extends Expression
The unary operation base class.
- See Also:
- Serialized Form
Methods inherited from class org.apache.xpath.Expression |
asIterator,
asNode,
assertion,
bool,
error,
execute,
execute,
executeCharsToContentHandler,
isNodesetExpr,
isStableNumber,
num,
setSourceLocator,
warn,
xstr |
Methods inherited from class java.lang.Object |
equals,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
UnaryOperation
public UnaryOperation()
fixupVariables
public void fixupVariables(java.util.Vector vars,
int globalsSize)
- This function is used to fixup variables from QNames to stack frame
indexes at stylesheet build time.
- Parameters:
vars
- List of QNames that correspond to variables. This list
should be searched backwards for the first qualified name that
corresponds to the variable reference qname. The position of the
QName in the vector from the start of the vector will be its position
in the stack frame (but variables above the globalsTop value will need
to be offset to the current stack frame).- Overrides:
- fixupVariables in class Expression
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 -
getOperand
public Expression getOperand()
- Returns:
- the operand of unary operation, as an Expression.
Copyright © 2001 Apache XML Project. All Rights Reserved.