TextTransfer.java

/**
 * Copyright 2011 multibit.org
 *
 * Licensed under the MIT license (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://opensource.org/licenses/mit-license.php
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.bither.viewsystem.action;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public final class TextTransfer implements ClipboardOwner {

    private final static Logger log = LoggerFactory.getLogger(TextTransfer.class);

    public static void main(String... aArguments) {
        TextTransfer textTransfer = new TextTransfer();

        // display what is currently on the clipboard
        log.debug("Clipboard contains: {}", textTransfer.getClipboardContents());

        // change the contents and then re-display
        textTransfer.setClipboardContents("blah, blah, blah");
        log.debug("Clipboard contains: {}", textTransfer.getClipboardContents());
    }

    /**
     * Empty implementation of the ClipboardOwner interface.
     */
    @Override
    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 e) {
                // highly unlikely since we are using a standard DataFlavor
                log.error("UnsupportedFlavorException: {}", e.getMessage(), e);
            } catch (IOException e) {
                log.error("IOException: {}", e.getMessage(), e);
            }
        }
        return result;
    }
}