Acceptance criteria
- The console accepts input for a new animal and adds that animal to the zoo.
Add a console command to add new animals
Acceptance Criteria
1.Add a console command to add new animals
Problem
Solution
A
Add methods to read various value types from the console.
1
Add methods to the ConsoleHelper and ConsoleUtil classes, as specified in the diagram below.
2
Add the method below to the Console.Util. You will need to add a using.
public static string GetTypes(Type type)
{
StringBuilder typeList = new StringBuilder();
foreach(string at in Enum.GetNames(type))
{
typeList.Append(at + "|");
}
return "|" + typeList.ToString();
}3
The ReadAlphabeticValue method uses the ReadStringValue method to prompt the user for a value, passing in the type of thing to look for (ex: Animal type, Name, Gender, etc).
Then, it checks if the return only contains letters and spaces. It contains the following code:
string result = null;
bool found = false;
while (!found)
{
result = ConsoleUtil.ReadStringValue(prompt);
if (Regex.IsMatch(result, @"^[a-zA-Z ]+$"))
{
found = true;
}
else
{
Console.WriteLine(prompt + " must contain only letters or spaces.");
}
}
return result;4
The ReadStringValue method prompts the user for a value using the passed in prompt parameter, trims and lower cases the return from the Console and ensures that a value was entered.
It contains the following code:
string result = null;
bool found = false;
while (!found)
{
Console.Write(prompt + "] ");
string stringValue = Console.ReadLine().ToLower().Trim();
if (stringValue != string.Empty)
{
result = stringValue;
found = true;
}
else
{
Console.WriteLine(prompt + " must have a value.");
}
}
return result;5
The ReadIntValue method uses the ReadStringValue method to prompt the user for a value, then takes that values and checks if it is a whole number.
It contains the following code:
int result = 0;
string stringValue = result.ToString();
bool found = false;
while (!found)
{
stringValue = ConsoleUtil.ReadStringValue(prompt);
if (int.TryParse(stringValue, out result))
{
found = true;
}
else
{
Console.WriteLine(prompt + " must be a whole number.");
}
}
return result;6
The ReadDoubleValue method uses the ReadStringValue method to prompt the user for a value, then takes that value and checks if it is a double.
It contains the following code:
double result = 0.0;
string stringValue = result.ToString();
bool found = false;
while (!found)
{
stringValue = ConsoleUtil.ReadStringValue(prompt);
if (double.TryParse(stringValue, out result))
{
found = true;
}
else
{
Console.WriteLine(prompt + " must be either a whole number or a decimal number.");
}
}
return result;7
The ReadGender method uses the ReadStringValue method to prompt the user for a value and attempts to convert it to an enumeration value.
It contains the following code:
Gender result = Gender.Female;
string stringValue = result.ToString();
bool found = false;
while (!found)
{
stringValue = ConsoleUtil.ReadAlphabeticValue("Gender");
stringValue = ConsoleUtil.InitialUpper(stringValue);
if (Enum.TryParse<Gender>(stringValue, out result))
{
found = true;
}
else
{
Console.WriteLine("Invalid gender. Possible gender types: " + GetTypes(typeof(Gender)));
}
}
return result;B
Set up sequence for adding an animal.
1
Add a console command called "add".
2
In it, call the ConsoleHelper's ProcessAddCommand method.
3
Pass in the zoo and the second item in the commandWords array, which represents the type of object the user wants to add (e.g. "animal").
C
Modify the ProcessAddCommand method.
1
Switch on the type parameter.
2
Add cases for "animal" and default.
3
Call AddAnimal in the "animal" case.
4
Throw an exception in the default case with a message that states that the command only supports adding animals.
D
Fill out the ConsoleHelper's AddAnimal method.
The sequence of method calls will end up looking like the diagram below.
1
In the call to ReadAlphabeticValue, pass "Name" as the argument.
2
In the call to ReadIntValue, pass "Age" as the argument.
3
In the call to ReadDoubleValue, pass "Weight" as the argument.
4
Change the Weight setter in the Animal class to public by removing the protected modifier.
5
Before all of the calls, instantiate a Dingo and store it in a variable.
Pass in any values you want for the age, name, weight, and gender.
6
Assign the dingo's Name to the result of calling the ReadAlphabeticValue method.
7
Use the InitialUpper method to ensure the Dingo's name has the first letter uppercased.
8
Set the dingo's Gender to the result of calling the ReadGender method.
9
Set the dingo's Age to the result of calling the ReadIntValue method, passing in "Age".
10
Set the dingo's Weight to the result of calling the ReadDoubleValue method, passing in "Weight".
11
Add the animal to the zoo and show the animal to the console.
E
Check Your Work
1
Run the console application.
2
Type add animal.
3
A Name prompt should appear.
4
Typing the following values for the various properties should result in the dingo being added to the zoo and shown to the console.
- Name: Spot
- Gender: Male
- Age: 2
- Weight: 40.0
5
Test the validation of the various properties.
6
The console should continuously ask the user to enter a value while the value is invalid.
