source: java/installer2/src/net/oni2/aeinstaller/backend/oni/management/Logger.java

package net.oni2.aeinstaller.backend.oni.management;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;

import net.oni2.platformtools.applicationinvoker.ApplicationInvocationResult;

/**
 * @author Christian Illy
 */
public class Logger {
        PrintWriter log = null;

        /**
         * @param logfile
         *            File to log to
         * @throws FileNotFoundException
         *             Huh?
         */
        public Logger(File logfile) throws FileNotFoundException {
                log = new PrintWriter(logfile);
        }

        /**
         * Print an empty line
         */
        public void println() {
                log.println();
        }

        /**
         * Print a string as a line
         * 
         * @param line
         *            String to print
         */
        public void println(String line) {
                log.println(line);
        }

        /**
         * Print a formatted string as a line
         * 
         * @param fmt
         *            Format string
         * @param args
         *            Values
         */
        public void printlnFmt(String fmt, Object... args) {
                log.println(String.format(fmt, args));
        }

        /**
         * Close logger
         */
        public void close() {
                log.close();
                log = null;
        }

        /**
         * Log the application invocation result
         * 
         * @param result
         *            App result
         * @param onlyOnError
         *            Print returned output only on errorcode != 0
         */
        public void logAppOutput(ApplicationInvocationResult result,
                        boolean onlyOnError) {
                if (result != null) {
                        log.println("\t\t\tCalled:");
                        for (String s : result.cmdLine)
                                log.println("\t\t\t\t" + s);
                        log.println("\t\t\tReturned: " + result.errorCode);
                        if (!onlyOnError || result.errorCode != 0) {
                                for (String s : result.output)
                                        log.println("\t\t\t\t" + s);
                        }
                        log.println("\t\t\tDuration: " + result.time + " ms");
                        log.println();
                } else {
                        log.println("\t\t\tExecution of external tool failed.");
                }
        }

}