com.icl.saxon.expr
Class ArithmeticExpression

java.lang.Object
  extended by com.icl.saxon.expr.Expression
      extended by com.icl.saxon.expr.BinaryExpression
          extended by 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


Field Summary
 
Fields inherited from class com.icl.saxon.expr.BinaryExpression
operator, p1, p2
 
Fields inherited from class com.icl.saxon.expr.Expression
staticContext
 
Constructor Summary
ArithmeticExpression()
           
ArithmeticExpression(Expression p1, int operator, Expression p2)
           
 
Method Summary
 Value evaluate(Context c)
          Evaluate an expression.
 double evaluateAsNumber(Context c)
          Evaluate an expression as a Number.
 int getDataType()
          Determine the data type of the expression, if possible
 Expression reduce(int dependencies, Context context)
          Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
 
Methods inherited from class com.icl.saxon.expr.BinaryExpression
display, getDependencies, setDetails, simplify
 
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
 

Constructor Detail

ArithmeticExpression

public ArithmeticExpression()

ArithmeticExpression

public ArithmeticExpression(Expression p1,
                            int operator,
                            Expression p2)
Method Detail

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 removed
context - The context to be used for the partial evaluation
Returns:
a new expression that does not have any of the specified dependencies
Throws:
XPathException