Package org.apache.xpath.operations
Class UnaryOperation
- java.lang.Object
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- org.apache.xpath.Expression
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- org.apache.xpath.operations.UnaryOperation
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- All Implemented Interfaces:
java.io.Serializable
,javax.xml.transform.SourceLocator
,ExpressionNode
,ExpressionOwner
,XPathVisitable
public abstract class UnaryOperation extends Expression implements ExpressionOwner
The unary operation base class.- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description UnaryOperation()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description void
callVisitors(ExpressionOwner owner, XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for each member.boolean
canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside the current subtree.boolean
deepEquals(Expression expr)
Compare this object with another object and see if they are equal, include the sub heararchy.XObject
execute(XPathContext xctxt)
Execute the operand and apply the unary operation to the result.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.Expression
getExpression()
Get the raw Expression object that this class wraps.Expression
getOperand()
abstract XObject
operate(XObject right)
Apply the operation to two operands, and return the result.void
setExpression(Expression exp)
Set the raw expression object for this object.void
setRight(Expression r)
Set the expression operand for the operation.-
Methods inherited from class org.apache.xpath.Expression
asIterator, asIteratorRaw, asNode, assertion, bool, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isStableNumber, num, warn, xstr
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Method Detail
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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.- Specified by:
fixupVariables
in classExpression
- 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).
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canTraverseOutsideSubtree
public boolean canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside the current subtree.- Overrides:
canTraverseOutsideSubtree
in classExpression
- Returns:
- true if traversal outside the context node's subtree can occur.
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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.
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execute
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
Execute the operand and apply the unary operation to the result.- Specified by:
execute
in classExpression
- 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
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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
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getOperand
public Expression getOperand()
- Returns:
- the operand of unary operation, as an Expression.
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callVisitors
public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
Description copied from interface:XPathVisitable
This will traverse the heararchy, calling the visitor for each member. If the called visitor method returns false, the subtree should not be called.- Specified by:
callVisitors
in interfaceXPathVisitable
- Parameters:
owner
- The owner of the visitor, where that path may be rewritten if needed.visitor
- The visitor whose appropriate method will be called.- See Also:
XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)
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getExpression
public Expression getExpression()
Description copied from interface:ExpressionOwner
Get the raw Expression object that this class wraps.- Specified by:
getExpression
in interfaceExpressionOwner
- Returns:
- the raw Expression object, which should not normally be null.
- See Also:
ExpressionOwner.getExpression()
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setExpression
public void setExpression(Expression exp)
Description copied from interface:ExpressionOwner
Set the raw expression object for this object.- Specified by:
setExpression
in interfaceExpressionOwner
- Parameters:
exp
- the raw Expression object, which should not normally be null.- See Also:
ExpressionOwner.setExpression(Expression)
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deepEquals
public boolean deepEquals(Expression expr)
Description copied from class:Expression
Compare this object with another object and see if they are equal, include the sub heararchy.- Specified by:
deepEquals
in classExpression
- Parameters:
expr
- Another expression object.- Returns:
- true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.
- See Also:
Expression.deepEquals(Expression)
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