TextAreaOutputStream.java

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package fi.jyu.mit.fxgui;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

import javafx.scene.control.TextArea;


/**
 * Simple way to "print" to a JTextArea; just say
 * PrintStream out = new PrintStream(new TextAreaOutputStream(myTextArea));
 * Then out.println() et all will all appear in the TextArea.
 * Source: http://javacook.darwinsys.com/new_recipes/14.9betterTextToTextArea.jsp
 */
public final class TextAreaOutputStream extends OutputStream {

    private final TextArea textArea;
    // private final StringBuilder sb = new StringBuilder();

    /**
     * @param textArea area where to write
     * @example
     * <pre name="test">
     * #import java.io.*;
     * #import javax.swing.*;
     *   JTextArea text = new JTextArea();
     *   PrintStream tw = new PrintStream(new TextAreaOutputStream(text));
     *   tw.print("Hello");
     *   tw.print(" ");
     *   tw.print("world!");
     *   tw.flush();
     *   text.getText() === "Hello world!";
     *   text.setText("");
     *   tw.println("Hello");
     *   tw.println("world!");
     *   text.getText() =R= "Hello\\r?\\nworld!\\r?\\n";
     * </pre>
     */
    public TextAreaOutputStream(final TextArea textArea) {
        this.textArea = textArea;
    }

    @Override
    public void flush(){ 
        //textArea.append(sb.toString());
        //sb.setLength(0);
    }
    
    @Override
    public void close(){ /* */ }

    @Override
    public void write(int b) throws IOException {
        /*
        if (b == '\r')
            return;
        
        if (b == '\n') {
            textArea.append(sb.toString()+"\n");
            sb.setLength(0);
            return;
        }
        
        sb.append((char)b);
        */
        //textArea.append(Character.toString((char)b));
        write(new byte[] {(byte) b}, 0, 1);
    }
 
    @Override
    public void write(byte b[], int off, int len) throws IOException {  
        textArea.appendText(new String(b, off, len));  
    }    
    
    
    /**
     * Factory method for creating a PrintStream to print to selected TextArea
     * @param textArea area where to print
     * @return created PrintStream ready to print to TextArea
     * @example
     * <pre name="test">
     * #import java.io.*;
     * #import javax.swing.*;
     *   JTextArea text = new JTextArea();
     *   PrintStream tw = TextAreaOutputStream.getTextPrintStream(text);
     *   tw.print("Hyvää"); // skandit toimi
     *   tw.print(" ");
     *   tw.print("päivää!");
     *   text.getText() === "Hyvää päivää!";
     *   text.setText("");
     *   tw.print("ä");
     *   text.getText() === "ä"; 
     * </pre>
     */
    public static PrintStream getTextPrintStream(TextArea textArea) {
            return new PrintStream(new TextAreaOutputStream(textArea)); //,true,"ISO-8859-1");
    }
    
}