Package org.htmlunit.xpath.operations
Class UnaryOperation
- java.lang.Object
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- org.htmlunit.xpath.Expression
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- org.htmlunit.xpath.operations.UnaryOperation
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- All Implemented Interfaces:
javax.xml.transform.SourceLocator
,ExpressionNode
,XPathVisitable
public abstract class UnaryOperation extends Expression
The unary operation base class.
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Field Summary
Fields Modifier and Type Field Description protected Expression
m_right
The operand for the operation.
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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(XPathVisitor visitor)
This will traverse the hierarchy, 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 an expression in the XPath runtime context, and return the result of the expression.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 org.htmlunit.xpath.Expression
asIterator, asNode, assertion, bool, error, execute, execute, execute, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isSameClass, isStableNumber, num
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Field Detail
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m_right
protected Expression m_right
The operand for the operation.
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Method Detail
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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 an expression in the XPath runtime context, and return the result of the expression.- Specified by:
execute
in classExpression
- Parameters:
xctxt
- The XPath runtime context.- Returns:
- The result of the expression in the form of a
XObject
. - Throws:
javax.xml.transform.TransformerException
- if a runtime exception occurs.
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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
- in case of error
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callVisitors
public void callVisitors(XPathVisitor visitor)
This will traverse the hierarchy, calling the visitor for each member. If the called visitor method returns false, the subtree should not be called.- Parameters:
visitor
- The visitor whose appropriate method will be called.
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deepEquals
public boolean deepEquals(Expression expr)
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.
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