/*
 * Copyright 2008 (C) Jeffrey Palm
 *
 * This code is licensed under the GPL.
 */

import java.awt.*;
import java.awt.datatransfer.*;
import java.io.*;

/**
 * Copies the contents of all the input files to the clipboard.
 *
 * @author Jeffrey Palm
 */
public class CopyToClipboard {

  public static void main(String[] args) throws IOException {
    new CopyToClipboard().realMain(args);
  }

  void realMain(String[] args) throws IOException {
    //
    // A little error checking on the input
    //
    if (args.length == 0) {
      System.err.println("Usage: java " + getClass().getName() + " <file>+");
      System.err.println("where each file's content will be copied to the clipbard.");
      return;
    }
    //
    // Copy all the files to the clipboard
    //
    final TextTransfer tt = new TextTransfer();
    StringBuffer buf = new StringBuffer();
    for (String arg : args) {
      BufferedReader in = new BufferedReader(new FileReader(arg));
      String line;
      while ((line = in.readLine()) != null) {
        buf.append(line);
        buf.append("\n");
      }
      in.close();
    }
    String s = buf.toString();
    System.err.println("Copying " + s.length() + " chars to the clipboard");
    tt.setClipboardContents(s);
    System.err.println("Copied " + s.length() + " chars to the clipboard");
  }

  /**
   * Taken from: http://www.javapractices.com/Topic82.cjp
   */
  final static class TextTransfer implements ClipboardOwner {

    /**
     * Empty implementation of the ClipboardOwner interface.
     */
    public void lostOwnership( Clipboard aClipboard, Transferable aContents) {
      //do nothing
    }

    /**
     * Place a String on the clipboard, and make this class the
     * owner of the Clipboard's contents.
     */
    public void setClipboardContents( String aString ){
      StringSelection stringSelection = new StringSelection( aString );
      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
      clipboard.setContents( stringSelection, this );
    }

    /**
     * Get the String residing on the clipboard.
     *
     * @return any text found on the Clipboard; if none found, return an
     * empty String.
     */
    public String getClipboardContents() {
      String result = "";
      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
      //odd: the Object param of getContents is not currently used
      Transferable contents = clipboard.getContents(null);
      boolean hasTransferableText =
        (contents != null) &&
        contents.isDataFlavorSupported(DataFlavor.stringFlavor)
        ;
      if ( hasTransferableText ) {
        try {
          result = (String)contents.getTransferData(DataFlavor.stringFlavor);
        }
        catch (UnsupportedFlavorException ex){
          //highly unlikely since we are using a standard DataFlavor
          System.out.println(ex);
          ex.printStackTrace();
        }
        catch (IOException ex) {
          System.out.println(ex);
          ex.printStackTrace();
        }
      }
      return result;
    }
  }
}