Helper class for various tasks

GlasfrostUtils.java

/*
 * Copyright (c) 2014 Luis Hartmann
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.glasfrost;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JTextArea;

/**
 * Helper class by Luis Hartmann aka. GlasFrost
 * @author Luis Hartmann
 */
public class GlasfrostUtils {

    /**
     * Throws UnsupportedOperationException
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        L.log(Level.SEVERE, "Do not run main()", new UnsupportedOperationException("com.glasfrost.GlasfrostUtils.main() is not supposed to be run as stand-alone application."));
    }
    
    public static GlasfrostUtils getInstance(){
        return new GlasfrostUtils();
    }
    
    /**
     * Redirect System.err to jTextArea
     * @param textArea
     */
    public void errToTextArea(JTextArea textArea){
        PrintStream printStream = new PrintStream(new TextAreaOutputStream(textArea));
        System.setErr(printStream);
    }
    
    /**
     * Redirect System.out to jTextArea
     * @param textArea
     */
    public void outToTextArea(JTextArea textArea){
        PrintStream printStream = new PrintStream(new TextAreaOutputStream(textArea));
        System.setOut(printStream);
    }
    
    /**
     * Outputs data to given javax.swing.JTextArea
     */
    public class TextAreaOutputStream extends OutputStream {
        private JTextArea textArea;
        
        /**
         * Constructor
         * @param textArea jTextArea to output data into
         */
        public TextAreaOutputStream(JTextArea textArea) {
            this.textArea = textArea;
        }
        
        @Override
        public void write(int b) throws IOException {
            // Append data to jTextArea
            textArea.append(String.valueOf((char)b));
            // Scroll to the very end
            textArea.setCaretPosition(textArea.getDocument().getLength());
        }
    }
    
    /**
     * Logger for class GlasfrostUtils
     */
    public static final Logger L = Logger.getLogger(GlasfrostUtils.class.getName());
    
}