com.icl.saxon.expr
Class ArithmeticExpression
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.BinaryExpression
com.icl.saxon.expr.ArithmeticExpression
class ArithmeticExpression
- extends BinaryExpression
Arithmetic Expression: a numeric expression consisting of the sum, difference,
product, quotient, or modulus of two numeric expressions
Methods inherited from class com.icl.saxon.expr.Expression |
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ArithmeticExpression
public ArithmeticExpression()
ArithmeticExpression
public ArithmeticExpression(Expression p1,
int operator,
Expression p2)
evaluate
public Value evaluate(Context c)
throws XPathException
- Evaluate an expression.
- Specified by:
evaluate
in class Expression
- Parameters:
context
- The context in which the expression is to be evaluated
- Returns:
- the value of the expression as a Value object, evaluated in the current context
- Throws:
XPathException
evaluateAsNumber
public double evaluateAsNumber(Context c)
throws XPathException
- Evaluate an expression as a Number.
- Overrides:
evaluateAsNumber
in class Expression
- Parameters:
context
- The context in which the expression is to be evaluated
- Returns:
- the value of the expression as a double, evaluated in the current context
- Throws:
XPathException
getDataType
public int getDataType()
- Determine the data type of the expression, if possible
- Specified by:
getDataType
in class Expression
- Returns:
- Value.NUMBER
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:
reduce
in class Expression
- Parameters:
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
- Returns:
- a new expression that does not have any of the specified
dependencies
- Throws:
XPathException