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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) 2012, 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.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.mozilla.*;
import org.eclipse.swt.widgets.*;

class PromptAuth2 {
	XPCOMObject supports;
	XPCOMObject promptAuth;
	int refCount = 0;
	long /*int*/ parent;

PromptAuth2 () {
	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 ();}
	};

	promptAuth = new XPCOMObject (new int[] {2, 0, 0, 4, 6}) {
		@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 PromptAuth (args[0], (int)/*64*/args[1], args[2], args[3]);}
		@Override
		public long /*int*/ method4 (long /*int*/[] args) {return AsyncPromptAuth (args[0], args[1], args[2], (int)/*64*/args[3], args[4], args[5]);}
	};
}

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

long /*int*/ getAddress () {
	return promptAuth.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_IAUTHPROMPT2_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {promptAuth.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;
}

Browser getBrowser () {
	if (parent == 0) return null;
	return Mozilla.getBrowser (parent);
}

void setParent(long /*int*/ aParent) {
	parent = aParent;
}

int PromptAuth(long /*int*/ aChannel, int level, long /*int*/ authInfo, long /*int*/ _retval) {
	nsIAuthInformation auth = new nsIAuthInformation (authInfo);

	Browser browser = getBrowser ();
	if (browser != null) {
		Mozilla mozilla = (Mozilla)browser.webBrowser;
		/*
		 * Do not invoke the listeners if this challenge has been failed too many
		 * times because a listener is likely giving incorrect credentials repeatedly
		 * and will do so indefinitely.
		 */
		if (mozilla.authCount++ < 3) {
			for (int i = 0; i < mozilla.authenticationListeners.length; i++) {
				AuthenticationEvent event = new AuthenticationEvent (browser);
				event.location = mozilla.lastNavigateURL;
				mozilla.authenticationListeners[i].authenticate (event);
				if (!event.doit) {
					XPCOM.memmove (_retval, new boolean[] {false});
					return XPCOM.NS_OK;
				}
				if (event.user != null && event.password != null) {
					nsEmbedString string = new nsEmbedString (event.user);
					int rc = auth.SetUsername (string.getAddress ());
					if (rc != XPCOM.NS_OK) SWT.error (rc);
					string.dispose ();
					string = new nsEmbedString (event.password);
					rc = auth.SetPassword (string.getAddress ());
					if (rc != XPCOM.NS_OK) SWT.error (rc);
					string.dispose ();
					XPCOM.memmove (_retval, new boolean[] {true});
					return XPCOM.NS_OK;
				}
			}
		}
	}

	/* no listener handled the challenge, so show an authentication dialog */

	String checkLabel = null;
	boolean[] checkValue = new boolean[1];
	String[] userLabel = new String[1], passLabel = new String[1];

	String title = SWT.getMessage ("SWT_Authentication_Required"); //$NON-NLS-1$

	/* get initial username and password values */

	nsEmbedString ptr = new nsEmbedString ();
	int rc = auth.GetUsername (ptr.getAddress());
	if (rc != XPCOM.NS_OK) SWT.error (rc);
	userLabel[0] = ptr.toString ();
	ptr.dispose ();

	ptr = new nsEmbedString ();
	rc = auth.GetPassword (ptr.getAddress());
	if (rc != XPCOM.NS_OK) SWT.error (rc);
	passLabel[0] = ptr.toString ();
	ptr.dispose ();

	/* compute the message text */

	ptr = new nsEmbedString ();
	rc = auth.GetRealm (ptr.getAddress());
	if (rc != XPCOM.NS_OK) SWT.error (rc);
	String realm = ptr.toString ();
	ptr.dispose ();

	nsIChannel channel = new nsIChannel (aChannel);
	long /*int*/[] uri = new long /*int*/[1];
	rc = channel.GetURI (uri);
	if (rc != XPCOM.NS_OK) SWT.error (rc);
	if (uri[0] == 0) Mozilla.error (XPCOM.NS_NOINTERFACE);

	nsIURI nsURI = new nsIURI (uri[0]);
	long /*int*/ host = XPCOM.nsEmbedCString_new ();
	rc = nsURI.GetHost (host);
	if (rc != XPCOM.NS_OK) SWT.error (rc);
	int length = XPCOM.nsEmbedCString_Length (host);
	long /*int*/ buffer = XPCOM.nsEmbedCString_get (host);
	byte[] bytes = new byte[length];
	XPCOM.memmove (bytes, buffer, length);
	String hostString = new String (bytes);
	XPCOM.nsEmbedCString_delete (host);
	nsURI.Release ();

	String message;
	if (realm.length () > 0 && hostString.length () > 0) {
		message = Compatibility.getMessage ("SWT_Enter_Username_and_Password", new String[] {realm, hostString}); //$NON-NLS-1$
	} else {
		message = ""; //$NON-NLS-1$
	}

	/* open the prompter */
	Shell shell = browser == null ? new Shell () : browser.getShell ();
	PromptDialog dialog = new PromptDialog (shell);
	boolean[] result = new boolean[1];
	dialog.promptUsernameAndPassword (title, message, checkLabel, userLabel, passLabel, checkValue, result);

	XPCOM.memmove (_retval, result);
	if (result[0]) {	/* User selected OK */
		nsEmbedString string = new nsEmbedString (userLabel[0]);
		rc = auth.SetUsername(string.getAddress ());
		if (rc != XPCOM.NS_OK) SWT.error (rc);
		string.dispose ();

		string = new nsEmbedString (passLabel[0]);
		rc = auth.SetPassword(string.getAddress ());
		if (rc != XPCOM.NS_OK) SWT.error (rc);
		string.dispose ();
	}

	return XPCOM.NS_OK;
}

int AsyncPromptAuth(long /*int*/ aChannel, long /*int*/ aCallback, long /*int*/ aContext, int level, long /*int*/ authInfo, long /*int*/ _retval) {
	return XPCOM.NS_ERROR_NOT_IMPLEMENTED;
}
}