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add Behavioral Patterns examples Part 3
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‎Assets/Behavioral Patterns/State Pattern/Exmaple1.meta‎

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‎Assets/Behavioral Patterns/State Pattern/Exmaple1/StateExample1.cs‎

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//-------------------------------------------------------------------------------------
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// StateExample1.cs
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//-------------------------------------------------------------------------------------
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using UnityEngine;
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using System.Collections;
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//This real-world code demonstrates the State pattern which allows an Account to behave differently depending on its balance.
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//The difference in behavior is delegated to State objects called RedState, SilverState and GoldState.
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//These states represent overdrawn accounts, starter accounts, and accounts in good standing.
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namespace StateExample1
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{
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public class StateExample1 : MonoBehaviour
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{
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void Start()
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{
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// Open a new account
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Account account = new Account("Jim Johnson");
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// Apply financial transactions
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account.Deposit(500.0);
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account.Deposit(300.0);
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account.Deposit(550.0);
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account.PayInterest();
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account.Withdraw(2000.00);
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account.Withdraw(1100.00);
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}
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}
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/// <summary>
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/// The 'State' abstract class
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/// </summary>
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abstract class State
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{
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protected Account account;
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protected double balance;
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protected double interest;
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protected double lowerLimit;
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protected double upperLimit;
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// Properties
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public Account Account
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{
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get { return account; }
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set { account = value; }
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}
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public double Balance
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{
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get { return balance; }
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set { balance = value; }
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}
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public abstract void Deposit(double amount);
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public abstract void Withdraw(double amount);
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public abstract void PayInterest();
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}
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/// <summary>
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/// A 'ConcreteState' class
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/// <remarks>
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/// Red indicates that account is overdrawn
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/// </remarks>
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/// </summary>
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class RedState : State
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{
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private double _serviceFee;
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// Constructor
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public RedState(State state)
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{
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this.balance = state.Balance;
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this.account = state.Account;
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Initialize();
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}
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private void Initialize()
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{
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// Should come from a datasource
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interest = 0.0;
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lowerLimit = -100.0;
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upperLimit = 0.0;
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_serviceFee = 15.00;
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}
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public override void Deposit(double amount)
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{
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balance += amount;
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StateChangeCheck();
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}
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public override void Withdraw(double amount)
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{
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amount = amount - _serviceFee;
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Debug.Log("No funds available for withdrawal!");
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}
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public override void PayInterest()
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{
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// No interest is paid
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}
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private void StateChangeCheck()
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{
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if (balance > upperLimit)
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{
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account.State = new SilverState(this);
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}
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}
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}
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/// <summary>
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/// A 'ConcreteState' class
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/// <remarks>
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/// Silver indicates a non-interest bearing state
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/// </remarks>
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/// </summary>
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class SilverState : State
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{
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// Overloaded constructors
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public SilverState(State state) :
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this(state.Balance, state.Account)
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{
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}
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public SilverState(double balance, Account account)
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{
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this.balance = balance;
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this.account = account;
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Initialize();
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}
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private void Initialize()
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{
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// Should come from a datasource
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interest = 0.0;
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lowerLimit = 0.0;
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upperLimit = 1000.0;
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}
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public override void Deposit(double amount)
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{
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balance += amount;
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StateChangeCheck();
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}
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public override void Withdraw(double amount)
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{
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balance -= amount;
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StateChangeCheck();
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}
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public override void PayInterest()
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{
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balance += interest * balance;
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StateChangeCheck();
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}
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private void StateChangeCheck()
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{
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if (balance < lowerLimit)
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{
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account.State = new RedState(this);
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}
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else if (balance > upperLimit)
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{
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account.State = new GoldState(this);
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}
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}
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}
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/// <summary>
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/// A 'ConcreteState' class
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/// <remarks>
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/// Gold indicates an interest bearing state
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/// </remarks>
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/// </summary>
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class GoldState : State
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{
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// Overloaded constructors
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public GoldState(State state)
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: this(state.Balance, state.Account)
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{
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}
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public GoldState(double balance, Account account)
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{
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this.balance = balance;
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this.account = account;
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Initialize();
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}
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private void Initialize()
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{
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// Should come from a database
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interest = 0.05;
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lowerLimit = 1000.0;
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upperLimit = 10000000.0;
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}
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public override void Deposit(double amount)
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{
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balance += amount;
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StateChangeCheck();
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}
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public override void Withdraw(double amount)
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{
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balance -= amount;
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StateChangeCheck();
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}
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public override void PayInterest()
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{
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balance += interest * balance;
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StateChangeCheck();
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}
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private void StateChangeCheck()
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{
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if (balance < 0.0)
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{
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account.State = new RedState(this);
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}
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else if (balance < lowerLimit)
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{
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account.State = new SilverState(this);
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}
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}
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}
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/// <summary>
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/// The 'Context' class
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/// </summary>
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class Account
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{
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private State _state;
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private string _owner;
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// Constructor
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public Account(string owner)
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{
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// New accounts are 'Silver' by default
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this._owner = owner;
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this._state = new SilverState(0.0, this);
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}
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// Properties
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public double Balance
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{
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get { return _state.Balance; }
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}
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public State State
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{
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get { return _state; }
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set { _state = value; }
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}
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public void Deposit(double amount)
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{
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_state.Deposit(amount);
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Debug.Log("Deposited " + amount + "---");
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Debug.Log(" Balance = " + this.Balance);
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Debug.Log(" Status = " + this.State.GetType().Name);
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Debug.Log("");
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}
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public void Withdraw(double amount)
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{
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_state.Withdraw(amount);
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Debug.Log("Deposited " + amount + "---");
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Debug.Log(" Balance = " + this.Balance);
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Debug.Log(" Status = " + this.State.GetType().Name + "\n");
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}
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public void PayInterest()
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{
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_state.PayInterest();
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Debug.Log("Interest Paid --- ");
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Debug.Log(" Balance = " + this.Balance);
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Debug.Log(" Status = " + this.State.GetType().Name);
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}
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}
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}

‎Assets/Behavioral Patterns/State Pattern/Exmaple1/StateExample1.cs.meta‎

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‎Assets/Behavioral Patterns/State Pattern/Exmaple1/StatePatternExample1.unity‎

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‎Assets/Behavioral Patterns/State Pattern/Exmaple2.meta‎

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