Class BusyExprValue


public class BusyExprValue extends Object
BusyExprValue class contains a BinaryOperationNode. So we only consider expressions that are in form of BinaryOperationNode: lefOperandNode operator rightOperandNode. We override .equals in this class to compare nodes by value equality rather than reference equality. We want two different nodes with the same value (that is, two nodes refer to the same busy expression in the program) to be regarded as the same.