source: java/installer2/src/net/oni2/aeinstaller/backend/LogPrintStream.java@ 1016

package net.oni2.aeinstaller.backend;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

/**
 * @author Christian Illy
 */
public class LogPrintStream extends OutputStream {
        private static LogPrintStream instance = new LogPrintStream();

        private ByteArrayOutputStream baos = new ByteArrayOutputStream();
        private FileWriter fw = null;
        private PrintStream stdOut = null;

        private boolean logStdOut = true;

        private LogPrintStream() {
                stdOut = System.out;

                PrintStream ps = new PrintStream(this);
                System.setOut(ps);
                System.setErr(ps);
        }

        /**
         * @return Logger instance
         */
        public static LogPrintStream getInstance() {
                return instance;
        }

        /**
         * Set the file to log to
         * 
         * @param logFile
         *            Log file
         * @throws IOException
         *             Should not happen?!
         */
        public void setFile(File logFile) throws IOException {
                if (fw != null)
                        fw.close();
                fw = new FileWriter(logFile);
        }

        @Override
        public void write(int b) throws IOException {
                baos.write(b);
                if (logStdOut)
                        stdOut.write(b);
                if (fw != null)
                        fw.write(b);
        }

        /**
         * @return Get the text that has been written to log up to now
         */
        public String getLog() {
                return baos.toString();
        }

        @Override
        public void flush() throws IOException {
                stdOut.flush();
                baos.flush();
                if (fw != null)
                        fw.flush();
        }

        @Override
        public void close() throws IOException {
                if (fw != null)
                        fw.close();
                super.close();
        }
}