getValue method

Implementation

@override
bool getValue(DartBlockArbiter arbiter) {
  if (operator != null && leftChild != null && rightChild != null) {
    switch (operator!) {
      case DartBlockNumberComparisonOperator.equal:
        return leftChild!.value.getValue(arbiter) ==
            rightChild!.value.getValue(arbiter);
      case DartBlockNumberComparisonOperator.notEqual:
        return leftChild!.value.getValue(arbiter) !=
            rightChild!.value.getValue(arbiter);
      case DartBlockNumberComparisonOperator.greater:
        return leftChild!.value.getValue(arbiter) >
            rightChild!.value.getValue(arbiter);
      case DartBlockNumberComparisonOperator.greaterOrEqual:
        return leftChild!.value.getValue(arbiter) >=
            rightChild!.value.getValue(arbiter);
      case DartBlockNumberComparisonOperator.less:
        return leftChild!.value.getValue(arbiter) <
            rightChild!.value.getValue(arbiter);
      case DartBlockNumberComparisonOperator.lessOrEqual:
        return leftChild!.value.getValue(arbiter) <=
            rightChild!.value.getValue(arbiter);
    }
  } else {
    if (operator == null && leftChild == null && rightChild == null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "An operator (>, >=, ==, !=, <=, <) and two operands are required. ('${toString()}')",
      );
    } else if (operator == null && leftChild != null && rightChild != null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "An operator (>, >=, ==, !=, <=, <) is required. ('${toString()}')",
      );
    } else if (operator == null && leftChild == null && rightChild != null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "An operator (>, >=, ==, !=, <=, <) and a left operand are required. ('${toString()}')",
      );
    } else if (operator == null && leftChild != null && rightChild == null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "An operator (>, >=, ==, !=, <=, <) and a right operand are required. ('${toString()}')",
      );
    } else if (operator != null && leftChild == null && rightChild == null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "Two operands are required. ('${toString()}')",
      );
    } else if (operator != null && leftChild == null && rightChild != null) {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "A left operand is required. ('${toString()}')",
      );
    }
    // No right operand
    else {
      throw MalformedBooleanNumberComparisonExpressionException(
        null,
        null,
        null,
        "A right operand is required. ('${toString()}')",
      );
    }
  }
}