State Pattern - Example of Treatment of pateint with different states…

… ie - stable, unstable and dischargable state pateint

StatePatternMedicalTreatmentExample/.gitignore

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+/bin

StatePatternMedicalTreatmentExample/src/com/premaseem/statePattern/ClientForMedicalTreatment.java

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+package com.premaseem.statePattern;
+
+import java.util.Scanner;
+
+public class ClientForMedicalTreatment {
+
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		int repeatRunFlag = 1;
+
+		System.out.println("This is State Pattern example where in treatment would be dependent on the state of the patient ) ");
+		TreatmentContext context = new TreatmentContext();
+
+		// applyOxygen
+
+		while (repeatRunFlag == 1) {
+		// Uncomment below line to take input of patient type 
+			// takePatientTypeInput(scan, context);
+
+			context.setState(context.unStablePatientState);
+			System.out.println("What treatment should be given to this patient with current state " + context.getState().getClass().getSimpleName());
+			System.out.println(" Press 1 for admiting in ICU");
+			System.out.println(" Press 2  for prescribing general Medicine ");
+			System.out.println(" Press 3 for supply of Oxygen");
+			System.out.println(" Press 4 for supply of Normal food");
+			System.out.println(" Press 5 for recommending a walk ");
+
+			int treatmentType = scan.nextInt();
+
+			switch (treatmentType) {
+			case 1:
+				context.admitInICU();
+				break;
+			case 2:
+				context.prescribeGeneralMedicine();
+				break;
+			case 3:
+				context.supplyOxygen();
+				break;
+			case 4:
+				context.supplyNormalFood();
+				break;
+
+			case 5:
+				context.recommendWalking();
+				break;
+			}
+
+			System.out.println("Current state of Pateint is  " + context.getState().getClass().getSimpleName());
+			System.out.println("Press 1 for further treamemt and 0 for EXIT .... ");
+			try {
+				repeatRunFlag = scan.nextInt();
+			} catch (Exception e) {
+				repeatRunFlag = 0;
+			}
+
+		}
+	}
+
+	private static void takePatientTypeInput(Scanner scan, TreatmentContext context) {
+	    System.out.println("Please choose state of your patient before starting treatment ");
+	    System.out.println(" Press 1 for unstalbe state patient");
+	    System.out.println(" Press 2 for stable state patient ");
+	    System.out.println(" Press 3 for dischargable state patient ");
+	    int entType = scan.nextInt();
+
+	    switch (entType) {
+	    case 1:
+	    	context.setState(context.stablePatientState);
+	    	break;
+	    case 2:
+	    	context.setState(context.unStablePatientState);
+	    	break;
+	    case 3:
+	    	context.setState(context.dischargePatientState);
+	    	break;
+	    }
+    }
+}

StatePatternMedicalTreatmentExample/src/com/premaseem/statePattern/PatientHealthState.java

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+package com.premaseem.statePattern;
+
+public interface PatientHealthState {
+
+	void supplyOxygen();
+
+	void supplyOralFood();
+
+	void recommendWalking();
+
+	void prescribeGeneralMedicine();
+
+	void admitInICU();
+}
+
+class StablePatientState implements PatientHealthState {
+
+	TreatmentContext context;
+
+	public StablePatientState(TreatmentContext context) {
+		this.context = context;
+	}
+
+	@Override
+	public void supplyOxygen() {
+		System.out.println("Stable pateint do not need oxygen ");
+	}
+
+	@Override
+	public void supplyOralFood() {
+		System.out.println(" Required at this stage and lets pateint to become healthy and get discharged ");
+		 context.setState(context.stablePatientState);
+	}
+
+	@Override
+	public void recommendWalking() {
+		System.out.println(" Do not walk while pateient get discharge ");
+	}
+
+	@Override
+	public void prescribeGeneralMedicine() {
+		System.out.println(" will help in improvement ");
+	}
+
+	@Override
+	public void admitInICU() {
+		System.out.println(" No need of ICU ");
+		context.setState(context.unStablePatientState);
+	}
+}
+
+class UnStablePatientState implements PatientHealthState {
+
+	TreatmentContext context;
+
+	public UnStablePatientState(TreatmentContext context) {
+		this.context = context;
+	}
+
+	@Override
+	public void supplyOxygen() {
+		System.out.println("UnStable pateint do need oxygen ");
+		context.setState(context.stablePatientState);
+	}
+
+	@Override
+	public void supplyOralFood() {
+		System.out.println(" supply blood and liquids - no oral food please ");
+		context.setState(context.stablePatientState);
+	}
+
+	@Override
+	public void recommendWalking() {
+		System.out.println(" Do not dare ");
+	}
+
+	@Override
+	public void prescribeGeneralMedicine() {
+		System.out.println(" needs advanded medicine other wise patient will become unstable ");
+	}
+
+	@Override
+	public void admitInICU() {
+		System.out.println(" Correct step ");
+	}
+}
+
+class DischargePatientState implements PatientHealthState {
+
+	TreatmentContext context;
+
+	public DischargePatientState(TreatmentContext context) {
+		this.context = context;
+	}
+
+	@Override
+	public void supplyOxygen() {
+		System.out.println("Will make patient unstable ...  ");
+		context.setState(context.unStablePatientState);
+	}
+
+	@Override
+	public void supplyOralFood() {
+		System.out.println(" enjoy ");
+		// context.setState(context.);
+	}
+
+	@Override
+	public void recommendWalking() {
+		System.out.println(" Enjoy  ");
+	}
+
+	@Override
+	public void prescribeGeneralMedicine() {
+		System.out.println(" no need ");
+	}
+
+	@Override
+	public void admitInICU() {
+		System.out.println(" no need");
+		context.setState(context.unStablePatientState);
+	}
+}

StatePatternMedicalTreatmentExample/src/com/premaseem/statePattern/TreatmentContext.java

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+package com.premaseem.statePattern;
+
+public class TreatmentContext {
+
+	PatientHealthState state;
+	StablePatientState stablePatientState = new StablePatientState(this);
+	UnStablePatientState unStablePatientState = new UnStablePatientState(this);
+	DischargePatientState dischargePatientState = new DischargePatientState(this);
+
+
+	public PatientHealthState getState() {
+		return state;
+	}
+
+	public void setState(PatientHealthState state) {
+		this.state = state;
+	}
+
+
+	void prescribeGeneralMedicine(){
+		state.prescribeGeneralMedicine();
+	}
+
+	void admitInICU(){
+		state.admitInICU();
+	}
+
+
+	void supplyOxygen(){
+		state.supplyOxygen();
+	}
+
+	void supplyNormalFood(){
+		state.supplyOralFood();
+	}
+
+	void recommendWalking(){
+		state.recommendWalking();
+	}
+
+}