org.activemath.exercises.openmath.services
Class CasExpressionEvaluator

java.lang.Object
  org.activemath.exercises.openmath.OpenMathService
      org.activemath.exercises.openmath.services.CasExpressionEvaluator

Direct Known Subclasses:

CasExpressionEvaluatorMaxima, CasExpressionEvaluatorProcess, CasExpressionEvaluatorSocket, CasExpressionEvaluatorWsdl, CasExpressionEvaluatorXmlHttp, CasExpressionEvaluatorXmlRpc

public class CasExpressionEvaluator
extends OpenMathService

CAS expression evaluator OpenMath service. Evaluates OpenMath expressions using an external Computer Algebra System.

Version:

$Revision: 1.22 $ $Date: 2009/07/28 14:21:30 $

Field Summary

Fields inherited from class org.activemath.exercises.openmath.OpenMathService

comparatorCD, comparatorName, context, expressionTransformer, om, xpathError, xpathHint, xpathQuit

Constructor Summary

protected

CasExpressionEvaluator()

Method Summary

protected static String	buildCasExpression(org.jdom.Element omobj, Map variables)
protected org.jdom.Element	cas(String expression)
org.jdom.Element	evaluate(org.jdom.Element expressionOmobj, Map variables) Evaluate the expression, and return its value as the JDom tree of the OpenMath XML with the result.
boolean	evaluateEquivalence(org.jdom.Element a, org.jdom.Element b, Map variables) Test whether two expressions are equivalent.

Methods inherited from class org.activemath.exercises.openmath.OpenMathService

abort, console, selectContext, setComparator, setExpressionTransformer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CasExpressionEvaluator

protected CasExpressionEvaluator()

Method Detail

evaluate

public org.jdom.Element evaluate(org.jdom.Element expressionOmobj,
                                 Map variables)

Description copied from class: OpenMathService

Evaluate the expression, and return its value as the JDom tree of the OpenMath XML with the result.

Overrides:

evaluate in class OpenMathService

Returns:

OMOBJ element (with OM namespace) containing the value.

evaluateEquivalence

public boolean evaluateEquivalence(org.jdom.Element a,
                                   org.jdom.Element b,
                                   Map variables)

Description copied from class: OpenMathService

Test whether two expressions are equivalent.

Overrides:

evaluateEquivalence in class OpenMathService

Returns:

true if the expressions are equivalent, and false otherwise.

cas

protected org.jdom.Element cas(String expression)

buildCasExpression

protected static String buildCasExpression(org.jdom.Element omobj,
                                           Map variables)