| /******************************************************************************* |
| * Copyright (c) 20007 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.carbon.*; |
| |
| /** |
| * 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 = "url "; //$NON-NLS-1$ |
| static final int URL_ID = registerType(URL); |
| static final String URLN = "urln"; //$NON-NLS-1$ |
| static final int URLN_ID = registerType(URLN); |
| |
| 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); |
| } |
| transferData.result = -1; |
| String url = (String)object; |
| int count = url.length(); |
| char[] chars = new char[count]; |
| url.getChars(0, count, chars, 0); |
| int cfstring = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, count); |
| if (cfstring == 0) return; |
| try { |
| CFRange range = new CFRange(); |
| range.length = chars.length; |
| int encoding = OS.kCFStringEncodingUTF8; |
| int[] size = new int[1]; |
| int numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, null, 0, size); |
| if (numChars == 0 || size[0] == 0) return; |
| byte[] buffer = new byte[size[0]]; |
| numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, buffer, size [0], size); |
| if (numChars == 0) return; |
| transferData.data = new byte[][] {buffer}; |
| transferData.result = 0; |
| } finally { |
| OS.CFRelease(cfstring); |
| } |
| } |
| |
| /** |
| * 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.data == null) return null; |
| if (transferData.data.length == 0) return null; |
| byte[] buffer = transferData.data[0]; |
| int encoding = OS.kCFStringEncodingUTF8; |
| int cfstring = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, true); |
| if (cfstring == 0) return null; |
| char[] unescapedChars = new char[] {'%'}; |
| int unescapedStr = OS.CFStringCreateWithCharacters(0, unescapedChars, unescapedChars.length); |
| int str = OS.CFURLCreateStringByReplacingPercentEscapes(OS.kCFAllocatorDefault, cfstring, unescapedStr); |
| OS.CFRelease(unescapedStr); |
| OS.CFRelease(cfstring); |
| if (str == 0) return null; |
| try { |
| int length = OS.CFStringGetLength(str); |
| if (length == 0) return null; |
| char[] chars = new char[length]; |
| CFRange range = new CFRange(); |
| range.length = length; |
| OS.CFStringGetCharacters(str, range, chars); |
| return new String(chars); |
| } finally { |
| OS.CFRelease(str); |
| } |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[] {URL_ID, URLN_ID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[] {URL, URLN}; |
| } |
| |
| boolean checkURL(Object object) { |
| return object != null && (object instanceof String) && ((String)object).length() > 0; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkURL(object); |
| } |
| } |