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The osx x86_64 swt jar as available in the Eclipse 4.6 (Neon) release for OSX. It is suitable for use with jface and other dependencies available from maven central in the org.eclipse.scout.sdk.deps group. The sources is copied from swt-4.6-cocoa-macosx-x86_64.zip from http://download.eclipse.org/eclipse/downloads/drops4/R-4.6-201606061100/ and javadoc is generated from sources.

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/*******************************************************************************
 * 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.cocoa.*;

/**
 * The class URLTransfer provides a platform specific mechanism
 * for converting text in URL format represented as a java String
 * to a platform specific representation of the data and vice versa. The string
 * must contain a fully specified url.
 *
 * An example of a java String containing a URL is shown below:
 *
 *  *     String url = "http://www.eclipse.org";
 * 
 *
 * @see Transfer
 * @since 3.4
 */
public class URLTransfer extends ByteArrayTransfer {

	static URLTransfer _instance = new URLTransfer();
	static final String URL = OS.NSURLPboardType.getString();
	static final String URL1 = OS.kUTTypeURL.getString();
	static final int URL_ID = registerType(URL);
	static final int URL_ID1 = registerType(URL1);

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 javaToNative converts a URL
 * represented by a java String to a platform specific representation.
 *
 * @param object a java String containing a URL
 * @param transferData an empty TransferData object that will
 *  	be filled in on return with the platform specific format of the data
 *
 * @see Transfer#nativeToJava
 */
@Override
public void javaToNative (Object object, TransferData transferData){
	if (!checkURL(object) || !isSupportedType(transferData)) {
		DND.error(DND.ERROR_INVALID_DATA);
	}
	String url = (String)object;
	NSString nsString = NSString.stringWith(url);
	NSString escapedString = nsString.stringByAddingPercentEscapesUsingEncoding(OS.NSUTF8StringEncoding);
	transferData.data = NSURL.URLWithString(escapedString);
}

/**
 * This implementation of nativeToJava converts a platform
 * specific representation of a URL to a java String.
 *
 * @param transferData the platform specific representation of the data to be converted
 * @return a java String containing a URL if the conversion was successful;
 * 		otherwise null
 *
 * @see Transfer#javaToNative
 */
@Override
public Object nativeToJava(TransferData transferData){
	if (!isSupportedType(transferData) || transferData.data == null) return null;
	NSURL nsUrl = (NSURL) transferData.data;
	NSString nsString = nsUrl.absoluteString();
	nsString = nsString.stringByReplacingPercentEscapesUsingEncoding(OS.NSUTF8StringEncoding);
	return nsString.getString();
}

@Override
protected int[] getTypeIds(){
	if (OS.VERSION >= 0x1060) {
		return new int[] {URL_ID, URL_ID1};
	} else {
		return new int[] {URL_ID};
	}
}

@Override
protected String[] getTypeNames(){
	if (OS.VERSION >= 0x1060) {
		return new String[] {URL, URL1};
	} else {
		return new String[] {URL};
	}
}

boolean checkURL(Object object) {
	return object != null && (object instanceof String) && ((String)object).length() > 0;
}

@Override
protected boolean validate(Object object) {
	return checkURL(object);
}
}