source: branches/ralph/src/main/java/de/ugoe/cs/autoquest/tasktrees/alignment/pal/io/OutputTarget.java @ 1573

// OutputTarget.java
//
// (c) 1999-2001 PAL Development Core Team
//
// This package may be distributed under the
// terms of the Lesser GNU General Public License (LGPL)


package de.ugoe.cs.autoquest.tasktrees.alignment.pal.io;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;




/**
 * convenience class to create output streams linked to
 * files, stdout, and strings
 *
 * @version $Id: OutputTarget.java,v 1.3 2001/07/13 14:39:13 korbinian Exp $
 *
 * @author Korbinian Strimmer
 */
public class OutputTarget extends PrintWriter
{
        //
        // Public stuff
        //

        /**
         * open file for writing
         *
         * @param name file name
         *
         * @return output stream
         */
        public static OutputTarget openFile(String name)
                throws IOException
        {
                return new OutputTarget(
                        new PrintWriter(
                        new BufferedWriter(
                        new FileWriter(name))));
        }
        
        /**
         * open standard out
         *
         * @return output stream
         */             
        public static OutputTarget openStdOut()
        {
                return new OutputTarget(new PrintWriter(System.out));
        }

        /**
         * "open" string to write into
         *
         * @return output stream
         */
        public static OutputTarget openString()
        {
                StringWriter sw = new StringWriter();

                return new OutputTarget(new PrintWriter(sw), sw);
        }
        
        /**
         * get string corresponding to current stream created by openString()
         *
         * @return string 
         */
        public String getString()
        {
                if (stringWriter == null)
                {
                        return "";
                }
                else
                {
                        return stringWriter.toString();
                }
        }
        
        
        //
        // Private stuff
        //
        
        private StringWriter stringWriter;
        
        // Private constructor
        private OutputTarget(PrintWriter out)
        {
                super(out);
        }

        private OutputTarget(PrintWriter out, StringWriter sw)
        {
                super(out);
                stringWriter = sw;
        }
}