Source for java.awt.datatransfer.StringSelection

   1: /* StringSelection.java -- Clipboard handler for text.
   2:    Copyright (C) 1999, 2004  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package java.awt.datatransfer;
  40: 
  41: import java.io.IOException;
  42: import java.io.StringReader;
  43: 
  44: /**
  45:   * This class transfers a string as plain text using the clipboard.
  46:   *
  47:   * @author Aaron M. Renn (arenn@urbanophile.com)
  48:   */
  49: public class StringSelection implements Transferable, ClipboardOwner
  50: {
  51: 
  52: /*
  53:  * Class Variables
  54:  */
  55: 
  56: // List of flavors we support
  57: // XXX: DataFlavor.plainTextFlavor is deprecated.
  58: static final DataFlavor[] supported_flavors
  59:    = { DataFlavor.stringFlavor,
  60:        DataFlavor.plainTextFlavor };
  61: 
  62: /*************************************************************************/
  63: 
  64: /*
  65:  * Instance Variables
  66:  */
  67: 
  68: // This is the data to transfer
  69: private String data;
  70: 
  71:   /**
  72:    * Transfer the specfied string as text.
  73:    *
  74:    * @param data the data for the string selection
  75:    */
  76:   public StringSelection(String data)
  77:   {
  78:     this.data = data;
  79:   }
  80: 
  81: /**
  82:   * Returns a list of supported data flavors.
  83:   *
  84:   * @return A list of supported data flavors.
  85:   */
  86: public DataFlavor[]
  87: getTransferDataFlavors()
  88: {
  89:   return(supported_flavors);
  90: }
  91: 
  92: /*************************************************************************/
  93: 
  94: /**
  95:   * Tests whether or not the specified data flavor is supported.
  96:   *
  97:   * @param flavor The data flavor to test.
  98:   *
  99:   * @return <code>true</code> if the data flavor is supported,
 100:   * <code>false</code> otherwise.
 101:   */
 102: public boolean
 103: isDataFlavorSupported(DataFlavor flavor)
 104: {
 105:   for (int i = 0; i < supported_flavors.length; i++)
 106:     if (supported_flavors[i].equals(flavor))
 107:        return(true);
 108: 
 109:   return(false);
 110: }
 111: 
 112: /*************************************************************************/
 113: 
 114: /**
 115:   * This method returns the data in the requested format.
 116:   *
 117:   * @param flavor The desired data flavor.
 118:   *
 119:   * @return The transferred data.
 120:   *
 121:   * @exception UnsupportedFlavorException If the specified flavor is not
 122:   * supported.
 123:   * @exception IOException If any other error occurs.
 124:   */
 125: public Object
 126: getTransferData(DataFlavor flavor) throws UnsupportedFlavorException,
 127:                                           IOException
 128: {
 129:   if (!isDataFlavorSupported(flavor))
 130:     throw new UnsupportedFlavorException(flavor);
 131: 
 132:   if (DataFlavor.plainTextFlavor == flavor)
 133:       /* The behavior of this method for DataFlavor.plainTextFlavor and
 134:          equivalent DataFlavors is inconsistent with the definition of
 135:          DataFlavor.plainTextFlavor. We choose to do like Sun's implementation
 136:          and return a Reader instead of an InputString. */
 137:       /* return(new StringBufferInputStream(data)); */
 138:       return(new StringReader(data));
 139:   else // DataFlavor.stringFlavor
 140:       return data;
 141: }
 142: 
 143: /*************************************************************************/
 144: 
 145: /**
 146:   * Called when ownership of the clipboard object is lost.
 147:   *
 148:   * @param clipboard The affected clipboard.
 149:   * @param contents The clipboard contents.
 150:   */
 151: public void
 152: lostOwnership(Clipboard clipboard, Transferable contents)
 153: {
 154:   // FIXME: What does this do?
 155: }
 156: 
 157: } // class StringSelection