org.problets.domain.model.expression.node.operator.bitwise
Class Bitwise

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.bitwise.Bitwise

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

BitAnd, BitComplement, BitOr, JURightShift, LeftShift, RightShift, Xor

public class Bitwise
extends Operator

To hold all constants specific to bitwise operators

Author:

Amruth Kumar

Field Summary

static java.lang.String	OPERATOR_INAPPLICABLE Error message presented when bitwise operator is applied to non-integer operand
static int	TOTAL_OPERATORS
static int	WORD_SIZE Number of bits assumed in the bit representation of operands, used for error generation of shift 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() Evaluates a binary bitwise operator
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
void	getLocalLearningObjectives(java.util.Vector learnObjVector) Overrides Operator.getLocalLearningObjectives().
java.lang.String	getQualifiedLearningObject() Method returns the name of the operator, disambiguated enough so that it can be easily credited in the student model.
static boolean	isBitwise(java.lang.String expression) Returns true if expression contains a bitwise operator, and false otherwise

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

clone, coerceToReal, contentEquals, contentEquals, getArity, getAssociativity, 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

OPERATOR_INAPPLICABLE

public static final java.lang.String OPERATOR_INAPPLICABLE

Error message presented when bitwise operator is applied to non-integer operand

See Also:

Constant Field Values

WORD_SIZE

public static final int WORD_SIZE

Number of bits assumed in the bit representation of operands, used for error generation of shift operators

See Also:

Constant Field Values

Method Detail

getLocalLearningObjectives

public void getLocalLearningObjectives(java.util.Vector learnObjVector)

Overrides Operator.getLocalLearningObjectives(). The answer being correct is a learning objective applicable to all bitwise operators. Not using integer operands is an error that applies to all bitwise operators. This is used by &, |, ^, <<, >>, ~. But, ~ uses its own function and does not call this version.

Overrides:

getLocalLearningObjectives in class Operator

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

isBitwise

public static boolean isBitwise(java.lang.String expression)

Returns true if expression contains a bitwise operator, and false otherwise

evaluate

public Value evaluate()

Evaluates a binary bitwise operator

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