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Calculator.java
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Calculator.java
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class Calculator {
private OperandFactory operandFactory;
private Validator[] validators;
Calculator () {
Validator operatorsValidator = new OperatorValidator();
Validator arabicValidator = new ArabicValidator();
Validator romanValidator = new RomanValidator();
Validator[] validators = new Validator[] { operatorsValidator, arabicValidator, romanValidator };
this.validators = validators;
this.operandFactory = new OperandFactory(validators);
}
private Operand createOperand (int value, String type) {
return this.operandFactory.create(Integer.toString(value), type);
}
private String calculate (SyntaxTree syntaxTree) {
int left = syntaxTree.getIntLeft();
int right = syntaxTree.getIntRight();
int result = -1;
if (syntaxTree.isMinus()) {
result = left - right;
} else if (syntaxTree.isDivide()) {
result = left / right;
} else if (syntaxTree.isMultiple()) {
result = left * right;
} else if (syntaxTree.isSum()) {
result = left + right;
}
Operand resultOperand = this.createOperand(result, syntaxTree.getNumericType());
return resultOperand.toString();
}
void start () {
SyntaxTree syntaxTree = InputParser.parseInput(this.validators[0], this.operandFactory);
if (!syntaxTree.isValid()) {
throw new IllegalArgumentException();
}
System.out.println(this.calculate(syntaxTree));
}
}