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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) 2003, 2013 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.browser;

import org.eclipse.swt.internal.C;
import org.eclipse.swt.internal.mozilla.*;

class DownloadFactory {
	XPCOMObject supports;
	XPCOMObject factory;
	int refCount = 0;

DownloadFactory () {
	createCOMInterfaces ();
}

int AddRef () {
	refCount++;
	return refCount;
}

void createCOMInterfaces () {
	/* Create each of the interfaces that this object implements */
	supports = new XPCOMObject (new int[] {2, 0, 0}) {
		@Override
		public long /*int*/ method0 (long /*int*/[] args) {return QueryInterface (args[0], args[1]);}
		@Override
		public long /*int*/ method1 (long /*int*/[] args) {return AddRef ();}
		@Override
		public long /*int*/ method2 (long /*int*/[] args) {return Release ();}
	};

	factory = new XPCOMObject (new int[] {2, 0, 0, 3, 1}) {
		@Override
		public long /*int*/ method0 (long /*int*/[] args) {return QueryInterface (args[0], args[1]);}
		@Override
		public long /*int*/ method1 (long /*int*/[] args) {return AddRef ();}
		@Override
		public long /*int*/ method2 (long /*int*/[] args) {return Release ();}
		@Override
		public long /*int*/ method3 (long /*int*/[] args) {return CreateInstance (args[0], args[1], args[2]);}
		@Override
		public long /*int*/ method4 (long /*int*/[] args) {return LockFactory ((int)/*64*/args[0]);}
	};
}

void disposeCOMInterfaces () {
	if (supports != null) {
		supports.dispose ();
		supports = null;
	}
	if (factory != null) {
		factory.dispose ();
		factory = null;
	}
}

long /*int*/ getAddress () {
	return factory.getAddress ();
}

int QueryInterface (long /*int*/ riid, long /*int*/ ppvObject) {
	if (riid == 0 || ppvObject == 0) return XPCOM.NS_ERROR_NO_INTERFACE;
	nsID guid = new nsID ();
	XPCOM.memmove (guid, riid, nsID.sizeof);

	if (guid.Equals (XPCOM.NS_ISUPPORTS_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {supports.getAddress ()}, C.PTR_SIZEOF);
		AddRef ();
		return XPCOM.NS_OK;
	}
	if (guid.Equals (XPCOM.NS_IFACTORY_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {factory.getAddress ()}, C.PTR_SIZEOF);
		AddRef ();
		return XPCOM.NS_OK;
	}

	XPCOM.memmove (ppvObject, new long /*int*/[] {0}, C.PTR_SIZEOF);
	return XPCOM.NS_ERROR_NO_INTERFACE;
}

int Release () {
	refCount--;
	if (refCount == 0) disposeCOMInterfaces ();
	return refCount;
}

/* nsIFactory */

int CreateInstance (long /*int*/ aOuter, long /*int*/ iid, long /*int*/ result) {
	Download download = new Download ();
	download.AddRef ();
	XPCOM.memmove (result, new long /*int*/[] {download.getAddress ()}, C.PTR_SIZEOF);
	return XPCOM.NS_OK;
}

int LockFactory (int lock) {
	return XPCOM.NS_OK;
}
}