| /******************************************************************************* |
| * Copyright (c) 2004, 2012 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.wst.common.snippets.internal; |
| |
| import org.eclipse.swt.dnd.ByteArrayTransfer; |
| import org.eclipse.swt.dnd.TransferData; |
| |
| /** |
| * Transfer type used for clipboard operations |
| * |
| * @see org.eclipse.swt.dnd.ClipBoard |
| */ |
| public class SnippetTransfer extends ByteArrayTransfer { |
| |
| private static SnippetTransfer instance; |
| |
| private static final String LOCAL_NAME = "Snippet " + System.currentTimeMillis(); //$NON-NLS-1$ |
| private static final int LOCAL_TYPE = registerType(LOCAL_NAME); |
| |
| private static String[] names = null; |
| private static int types[] = null; |
| |
| |
| /** |
| * @return the registered Transfer instance |
| */ |
| public static SnippetTransfer getTransferInstance() { |
| if (instance == null) { |
| instance = new SnippetTransfer(); |
| init(); |
| } |
| return instance; |
| } |
| |
| private static void init() { |
| types = new int[]{LOCAL_TYPE}; |
| names = new String[]{LOCAL_NAME}; |
| } |
| |
| private SnippetTransfer() { |
| super(); |
| } |
| |
| protected int[] getTypeIds() { |
| return types; |
| } |
| |
| protected String[] getTypeNames() { |
| return names; |
| } |
| |
| /** |
| * This records the time at which the transfer data was recorded. |
| */ |
| protected long startTime; |
| |
| /** |
| * This records the data being transferred. |
| */ |
| protected Object object; |
| |
| /** |
| * This records the object and current time and encodes only the current |
| * time into the transfer data. |
| */ |
| public void javaToNative(Object object, TransferData transferData) { |
| startTime = System.currentTimeMillis(); |
| this.object = object; |
| if (transferData != null) { |
| super.javaToNative(String.valueOf(startTime).getBytes(), transferData); |
| } |
| } |
| |
| /** |
| * This decodes the time of the transfer and returns the recorded the |
| * object if the recorded time and the decoded time match. |
| */ |
| public Object nativeToJava(TransferData transferData) { |
| byte[] bytes = (byte[]) super.nativeToJava(transferData); |
| if (bytes != null) { |
| long clipboardTime = Long.valueOf(new String(bytes)).longValue(); |
| return this.startTime == clipboardTime ? object : null; |
| } |
| return null; |
| } |
| |
| } |