CoR design pattern another version

Java

by techbard 2016. 7. 15. 23:59

# Handler.java

public abstract class Handler {
protected Handler nextHandler;

public void setNextHandler(Handler handler) {
this.nextHandler = handler;
}

public abstract void processRequest(Request request);
}

# Request.java

public class Request {
private int requestValue = 3;

public int getRequest() {
return requestValue;
}

public void setRequest(int value) {
this.requestValue = value;
}
}

# ProcessZero.java

public class ProcessZero extends Handler {

@Override
public void processRequest(Request request) {
if (request.getRequest() == 0)
System.out.println("request value is zero.");
else
nextHandler.processRequest(request);
}
}

# ProcessPlus.java

public class ProcessPlus extends Handler {

@Override
public void processRequest(Request request) {
if (request.getRequest() > 0)
System.out.println("request value is plus.");
else
nextHandler.processRequest(request);
}
}

# ProcessMinus.java

public class ProcessMinus extends Handler {

@Override
public void processRequest(Request request) {
if (request.getRequest() < 0)
System.out.println("request value is minus.");
else
nextHandler.processRequest(request);
}
}

# Main.java

public class Main {
public static void main(String[] args) {
Request request = new Request();
ProcessZero processZero = new ProcessZero();
ProcessMinus processMinus = new ProcessMinus();
ProcessPlus processPlus = new ProcessPlus();

processZero.setNextHandler(processMinus);
processMinus.setNextHandler(processPlus);

request.setRequest(0);
processZero.processRequest(request);

request.setRequest(1);
processZero.processRequest(request);

request.setRequest(-1);
processZero.processRequest(request);
}
}