| /******************************************************************************* |
| * Copyright (c) 2007, 2009 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.swt.dnd; |
| |
| import org.eclipse.swt.internal.wpf.OS; |
| |
| /** |
| * The class <code>URLTransfer</code> provides a platform specific mechanism |
| * for converting text in URL format represented as a java <code>String</code> |
| * to a platform specific representation of the data and vice versa. The string |
| * must contain a fully specified url. |
| * |
| * <p>An example of a java <code>String</code> containing a URL is shown below:</p> |
| * |
| * <code><pre> |
| * String url = "http://www.eclipse.org"; |
| * </code></pre> |
| * |
| * @see Transfer |
| * @since 3.4 |
| */ |
| public class URLTransfer extends ByteArrayTransfer { |
| |
| static URLTransfer _instance = new URLTransfer(); |
| static final String URL = "UniformResourceLocator"; //$NON-NLS-1$ |
| static final int URL_ID = registerType(URL); |
| |
| private URLTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the URLTransfer class. |
| * |
| * @return the singleton instance of the URLTransfer class |
| */ |
| public static URLTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts a URL |
| * represented by a java <code>String</code> to a platform specific representation. |
| * |
| * @param object a java <code>String</code> containing a URL |
| * @param transferData an empty <code>TransferData</code> object that will |
| * be filled in on return with the platform specific format of the data |
| * |
| * @see Transfer#nativeToJava |
| */ |
| public void javaToNative (Object object, TransferData transferData){ |
| if (!checkURL(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String string = (String)object + '\0'; |
| byte[] buffer = string.getBytes(); |
| if (buffer.length == 0) return; |
| int typeid = OS.Byte_typeid(); |
| int pBytes = OS.Array_CreateInstance(typeid, buffer.length); |
| OS.GCHandle_Free(typeid); |
| if (pBytes == 0) return; |
| OS.memcpy(pBytes, buffer, buffer.length); |
| int pStream = OS.gcnew_MemoryStream(); |
| OS.MemoryStream_Write(pStream, pBytes, 0, buffer.length); |
| OS.GCHandle_Free(pBytes); |
| transferData.pValue = pStream; |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform |
| * specific representation of a URL to a java <code>String</code>. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>String</code> containing a URL if the conversion was successful; |
| * otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| public Object nativeToJava(TransferData transferData){ |
| if (!isSupportedType(transferData) || transferData.pValue == 0) return null; |
| |
| int byteArray = OS.MemoryStream_ToArray(transferData.pValue); |
| int bLength = OS.Array_GetLength(byteArray, 0); |
| byte[] buffer = new byte[bLength]; |
| if (bLength == 0) return ""; |
| OS.memcpy(buffer, byteArray, bLength); |
| OS.GCHandle_Free(byteArray); |
| |
| String string = new String(buffer); |
| int end = string.indexOf('\0'); |
| return (end == -1) ? string : string.substring(0, end); |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[] {URL_ID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[] {URL}; |
| } |
| |
| boolean checkURL(Object object) { |
| return object != null && (object instanceof String) && ((String)object).length() > 0; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkURL(object); |
| } |
| } |