org.problets.domain.model.expression.node.operator.relational
Class Relational

java.lang.Object
  org.problets.domain.model.DomainModel
      org.problets.domain.model.expression.node.NodeModel
          org.problets.domain.model.expression.node.operator.Operator
              org.problets.domain.model.expression.node.operator.relational.Relational

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

Equals, GreaterEquals, GreaterThan, LessEquals, LessThan, NotEquals

public class Relational
extends Operator

To hold all constants specific to relational operators

Author:

Amruth Kumar

Field Summary

static java.lang.String	MIXED_OPERANDS
static int	TOTAL_OPERATORS

Fields inherited from class org.problets.domain.model.expression.node.operator.Operator

INCORRECT_OPERAND_COUNT

Fields inherited from class org.problets.domain.model.DomainModel

BOOLEAN, BREAKPOINT, CHARACTER, DOUBLE_PRECISION_REAL, ERROR_TYPE, EVAL_STATUS, expACTION, expASSIGNMENT, expAUTO_DEALLOCATION, expCALL, expCONDITION, expDECLARATION, expDEREFERENCING, expDYNAMIC_ALLOCATION, expDYNAMIC_ALLOCATION_INITIALIZATION, expDYNAMIC_DEALLOCATION, expELSE_CLAUSE, expERROR, expEXECUTION, expIF_CLAUSE, expINITIALIZATION, expINPUT, expPARAMETER_PASSING, expPRINT, expQUESTIONABLE, expREFERENCING, expRETURN, expRUNTIME_ERROR, expSEMANTIC_ERROR, expSYNTAX_ERROR, expUPDATE, IDENTITY, MAX_OBJECT_IDENTITY, MIN_OBJECT_IDENTITY, QUADRUPLE_PRECISION_REAL, RUNTIME_ERROR, SEMANTIC_ERROR, SIGNED_INTEGER, SIGNED_LONG, SIGNED_SHORT, SINGLE_PRECISION_REAL, SYNTAX_ERROR, UNDEFINED_TYPE, UNSIGNED_INTEGER, UNSIGNED_LONG, UNSIGNED_SHORT, WARNING

Method Summary

Value	evaluate() In Java/C#, <, <=, >, and >= cannot be applied to boolean operands.
void	explain(java.util.Vector explanation, java.util.Vector errors) Textually explains the evaluation of the tree - as opposed to graphical explanation by the view
java.lang.String	getQualifiedLearningObject() Method returns the name of the operator, disambiguated enough so that it can be easily credited in the student model.

Methods inherited from class org.problets.domain.model.expression.node.operator.Operator

clone, coerceToReal, contentEquals, contentEquals, getArity, getAssociativity, getLocalLearningObjectives, getOperatorType, getPrecedence, getStudentCopy, getSymbol, grade, locateOperator, main, recursiveContentEquals, recursiveSetValue

Methods inherited from class org.problets.domain.model.expression.node.NodeModel

classifyNodes, getContent, getLeftChild, getNonRecursiveContent, getOrder, getPosition, getRecursiveContent, getRightChild, getSideEffects, getValue, insertInOrder, setLeftChild, setOrder, setPosition, setRightChild, setValue, shortCircuit, skip, subExpToString, toString, valueEquals

Methods inherited from class org.problets.domain.model.DomainModel

getId, getIdName, grade

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TOTAL_OPERATORS

public static final int TOTAL_OPERATORS

See Also:

Constant Field Values

MIXED_OPERANDS

public static final java.lang.String MIXED_OPERANDS

See Also:

Constant Field Values

Method Detail

getQualifiedLearningObject

public java.lang.String getQualifiedLearningObject()

Method returns the name of the operator, disambiguated enough so that it can be easily credited in the student model.

Overrides:

getQualifiedLearningObject in class Operator

evaluate

public Value evaluate()

In Java/C#, <, <=, >, and >= cannot be applied to boolean operands. == and != can be applied as long as both the operands are boolean. This is being handled here in one shot for all the relational operators although this code could be moved into the 6 different classes for true object-orientation.

Overrides:

evaluate in class Operator

explain

public void explain(java.util.Vector explanation,
                    java.util.Vector errors)

Textually explains the evaluation of the tree - as opposed to graphical explanation by the view

Overrides:

explain in class Operator