package com.ora.rmibook.chapter4.printers;
import com.ora.rmibook.chapter4.*;
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
public class NullPrinter extends UnicastRemoteObject implements Printer {
private PrintWriter _log;
public NullPrinter(OutputStream log)
throws RemoteException {
_log = new PrintWriter(log);
}
public boolean printerAvailable() {
return true;
}
public boolean printDocument(DocumentDescription documentDescription)
throws PrinterException {
if (null == _log) {
throw new NoLogException();
}
if (null == documentDescription) {
throw new NoDocumentException();
}
_log.println("Printed file");
_log.flush();
if (_log.checkError()) {
throw new CantWriteToLogException();
}
return true;
}
private class NoLogException extends PrinterException {
public NoLogException() {
super (0, "Null printer failure. No log to record print request.");
}
}
private class NoDocumentException extends PrinterException {
public NoDocumentException() {
super (0, "Null printer failure. No document received as part of print request.");
}
}
private class CantWriteToLogException extends PrinterException {
public CantWriteToLogException() {
super (0, "Null printer failure. Attempt to record print request to log failed");
}
}
}
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