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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, 2016 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 java.util.ArrayList;
import java.util.List;

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

class AppFileLocProvider {
	XPCOMObject supports;
	XPCOMObject directoryServiceProvider;
	XPCOMObject directoryServiceProvider2;
	int refCount = 0;
	String mozillaPath, profilePath, cacheParentPath;
	String[] pluginDirs;
	boolean isXULRunner;

	static final String SEPARATOR_OS = System.getProperty ("file.separator"); //$NON-NLS-1$
	static final String CHROME_DIR = "chrome"; //$NON-NLS-1$
	static final String COMPONENTS_DIR = "components"; //$NON-NLS-1$
	static final String HISTORY_FILE = "history.dat"; //$NON-NLS-1$
	static final String LOCALSTORE_FILE = "localstore.rdf"; //$NON-NLS-1$
	static final String MIMETYPES_FILE = "mimeTypes.rdf"; //$NON-NLS-1$
	static final String MOZILLA_PLUGIN_PATH = "MOZ_PLUGIN_PATH"; //$NON-NLS-1$
	static final String PLUGINS_DIR = "plugins"; //$NON-NLS-1$
	static final String USER_PLUGINS_DIR = ".mozilla" + SEPARATOR_OS + "plugins"; //$NON-NLS-1$ //$NON-NLS-2$
	static final String PREFERENCES_FILE = "prefs.js"; //$NON-NLS-1$

	static boolean IsSparc;
	static {
		String osName = System.getProperty ("os.name").toLowerCase (); //$NON-NLS-1$
		String osArch = System.getProperty ("os.arch").toLowerCase (); //$NON-NLS-1$
		IsSparc = (osName.startsWith ("sunos") || osName.startsWith ("solaris")) && osArch.startsWith("sparc"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	}

AppFileLocProvider (String mozillaPath, String profilePath, String cacheParentPath, boolean isXULRunner) {
	this.mozillaPath = mozillaPath + SEPARATOR_OS;
	this.profilePath = profilePath + SEPARATOR_OS;
	this.cacheParentPath = cacheParentPath;
	this.isXULRunner = isXULRunner;
	if (!Compatibility.fileExists (profilePath, "")) { //$NON-NLS-1$
		long /*int*/[] result = new long /*int*/[1];
		nsEmbedString pathString = new nsEmbedString (profilePath);
		int rc = XPCOM.NS_NewLocalFile (pathString.getAddress (), 1, result);
		if (rc != XPCOM.NS_OK) Mozilla.error (rc);
		if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
		pathString.dispose ();

		nsILocalFile file = new nsILocalFile (result [0]);
		rc = file.Create (nsILocalFile.DIRECTORY_TYPE, 0700);
		if (rc != XPCOM.NS_OK) Mozilla.error (rc);
		file.Release ();
	}
	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 ();}
	};

	directoryServiceProvider = new XPCOMObject (new int[] {2, 0, 0, 3}) {
		@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 getFile (args[0], args[1], args[2]);}
	};

	directoryServiceProvider2 = new XPCOMObject (new int[] {2, 0, 0, 3, 2}) {
		@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 getFile (args[0], args[1], args[2]);}
		@Override
		public long /*int*/ method4 (long /*int*/[] args) {return getFiles (args[0], args[1]);}
	};
}

void disposeCOMInterfaces () {
	if (supports != null) {
		supports.dispose ();
		supports = null;
	}
	if (directoryServiceProvider != null) {
		directoryServiceProvider.dispose ();
		directoryServiceProvider = null;
	}
	if (directoryServiceProvider2 != null) {
		directoryServiceProvider2.dispose ();
		directoryServiceProvider2 = null;
	}
}

long /*int*/ getAddress () {
	return directoryServiceProvider.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_IDIRECTORYSERVICEPROVIDER_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {directoryServiceProvider.getAddress ()}, C.PTR_SIZEOF);
		AddRef ();
		return XPCOM.NS_OK;
	}
	if (guid.Equals (XPCOM.NS_IDIRECTORYSERVICEPROVIDER2_IID)) {
		XPCOM.memmove (ppvObject, new long /*int*/[] {directoryServiceProvider2.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;
}

/* nsIDirectoryServiceProvider2 */

int getFiles (long /*int*/ prop, long /*int*/ _retval) {
	int size = XPCOM.strlen (prop);
	byte[] bytes = new byte[size];
	XPCOM.memmove (bytes, prop, size);
	String propertyName = new String (MozillaDelegate.mbcsToWcs (null, bytes));
	String[] propertyValues = null;

	if (propertyName.equals (XPCOM.NS_APP_PLUGINS_DIR_LIST)) {
		if (pluginDirs == null) {
			int index = 0;
			/* set the first value(s) to the MOZ_PLUGIN_PATH environment variable value if it's defined */
			long /*int*/ ptr = C.getenv (MozillaDelegate.wcsToMbcs (null, MOZILLA_PLUGIN_PATH, true));
			if (ptr != 0) {
				int length = C.strlen (ptr);
				byte[] buffer = new byte[length];
				C.memmove (buffer, ptr, length);
				String value = new String (MozillaDelegate.mbcsToWcs (null, buffer));
				if (value.length () > 0) {
					String separator = System.getProperty ("path.separator"); // $NON-NLS-1$
					List segments = new ArrayList<> ();
					int start, end = -1;
					do {
						start = end + 1;
						end = value.indexOf (separator, start);
						String segment;
						if (end == -1) {
							segment = value.substring (start);
						} else {
							segment = value.substring (start, end);
						}
						if (segment.length () > 0) segments.add (segment);
					} while (end != -1);
					int segmentsSize = segments.size ();
					pluginDirs = new String [segmentsSize + (IsSparc ? 1 : 2)];
					for (index = 0; index < segmentsSize; index++) {
						pluginDirs[index] = segments.get (index);
					}
				}
			}
			if (pluginDirs == null) {
				pluginDirs = new String[IsSparc ? 1 : 2];
			}

			/* set the next value to the GRE path + "plugins" */

			/*
			* Bug on Solaris SPARC.  Attempting to start the java plug-in fails with an
			* error indicating that PR_NewMonitor could not be found.  This is a well-
			* known problem that many other apps have also encountered, with no
			* resolution other than to remove this plug-in.  The Browser workaround is
			* to not add the directory containing this plug-in to the plug-in search path.
			*/
			if (!IsSparc) {
				pluginDirs[index++] = mozillaPath + PLUGINS_DIR;
			}

			/* set the next value to the home directory + "/.mozilla/plugins" */
			pluginDirs[index++] = System.getProperty("user.home") + SEPARATOR_OS + USER_PLUGINS_DIR;
		}
		propertyValues = pluginDirs;
	}

	XPCOM.memmove(_retval, new long /*int*/[] {0}, C.PTR_SIZEOF);
	if (propertyValues != null) {
		long /*int*/[] result = new long /*int*/[1];
		nsISupports[] files = new nsISupports [propertyValues.length];
		int index = 0;
		for (int i = 0; i < propertyValues.length; i++) {
			nsEmbedString pathString = new nsEmbedString (propertyValues[i]);
			int rc = XPCOM.NS_NewLocalFile (pathString.getAddress (), 1, result);
			if (rc != XPCOM.NS_ERROR_FILE_UNRECOGNIZED_PATH) {
				/* value appears to be a valid pathname */
				if (rc != XPCOM.NS_OK) Mozilla.error (rc);
				if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);

				nsILocalFile localFile = new nsILocalFile (result[0]);
				result[0] = 0;
				rc = localFile.QueryInterface (IIDStore.GetIID (nsIFile.class), result);
				if (rc != XPCOM.NS_OK) Mozilla.error (rc);
				if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NO_INTERFACE);
				localFile.Release ();

				nsIFile file = new nsIFile (result[0]);
				files[index++] = file;
			}
			pathString.dispose ();
			result[0] = 0;
		}

		if (index < propertyValues.length) {
			/* there were some invalid values so remove the trailing empty array slots */
			nsISupports[] temp = new nsISupports [index];
			System.arraycopy (files, 0, temp, 0, index);
			files = temp;
		}

		SimpleEnumerator enumerator = new SimpleEnumerator (files);
		enumerator.AddRef ();
		XPCOM.memmove (_retval, new long /*int*/[] {enumerator.getAddress ()}, C.PTR_SIZEOF);
		return XPCOM.NS_OK;
	}

	return XPCOM.NS_ERROR_FAILURE;
}

/* nsIDirectoryServiceProvider implementation */

int getFile(long /*int*/ prop, long /*int*/ persistent, long /*int*/ _retval) {
	int size = XPCOM.strlen (prop);
	byte[] bytes = new byte[size];
	XPCOM.memmove (bytes, prop, size);
	String propertyName = new String (MozillaDelegate.mbcsToWcs (null, bytes));
	String propertyValue = null;

	if (propertyName.equals (XPCOM.NS_APP_HISTORY_50_FILE)) {
		propertyValue = profilePath + HISTORY_FILE;
	} else if (propertyName.equals (XPCOM.NS_APP_USER_MIMETYPES_50_FILE)) {
		propertyValue = profilePath + MIMETYPES_FILE;
	} else if (propertyName.equals (XPCOM.NS_APP_PREFS_50_FILE)) {
		propertyValue = profilePath + PREFERENCES_FILE;
	} else if (propertyName.equals (XPCOM.NS_APP_PREFS_50_DIR)) {
		propertyValue = profilePath;
	} else if (propertyName.equals (XPCOM.NS_APP_USER_CHROME_DIR)) {
		propertyValue = profilePath + CHROME_DIR;
	} else if (propertyName.equals (XPCOM.NS_APP_USER_PROFILE_50_DIR)) {
		propertyValue = profilePath;
	} else if (propertyName.equals (XPCOM.NS_APP_LOCALSTORE_50_FILE)) {
		propertyValue = profilePath + LOCALSTORE_FILE;
	} else if (propertyName.equals (XPCOM.NS_APP_CACHE_PARENT_DIR)) {
		propertyValue = cacheParentPath;
	} else if (propertyName.equals (XPCOM.NS_OS_HOME_DIR)) {
		propertyValue = System.getProperty("user.home");	//$NON-NLS-1$
	} else if (propertyName.equals (XPCOM.NS_OS_TEMP_DIR)) {
		propertyValue = System.getProperty("java.io.tmpdir");	//$NON-NLS-1$
	} else if (propertyName.equals (XPCOM.NS_GRE_DIR)) {
		propertyValue = mozillaPath;
	} else if (propertyName.equals (XPCOM.NS_GRE_COMPONENT_DIR)) {
		if (MozillaVersion.CheckVersion (MozillaVersion.VERSION_XR24, false)) {
			propertyValue = mozillaPath + COMPONENTS_DIR;
		} else {
			propertyValue = profilePath + COMPONENTS_DIR;
		}
	} else if (propertyName.equals (XPCOM.NS_XPCOM_INIT_CURRENT_PROCESS_DIR)) {
		propertyValue = mozillaPath;
	} else if (propertyName.equals (XPCOM.NS_OS_CURRENT_PROCESS_DIR)) {
		propertyValue = mozillaPath;
	} else if (propertyName.equals (XPCOM.NS_XPCOM_COMPONENT_DIR)) {
		if (MozillaVersion.CheckVersion (MozillaVersion.VERSION_XR24, false)) {
			propertyValue = profilePath + COMPONENTS_DIR;
		} else {
			propertyValue = mozillaPath + COMPONENTS_DIR;
		}
	} else if (propertyName.equals (XPCOM.NS_XPCOM_CURRENT_PROCESS_DIR)) {
		if (MozillaVersion.CheckVersion (MozillaVersion.VERSION_XR24, false)) {
			propertyValue = profilePath;
		} else {
			propertyValue = mozillaPath;
		}
	} else if (propertyName.equals (XPCOM.NS_APP_PREF_DEFAULTS_50_DIR)) {
		/*
		* Answering a value for this property causes problems in Mozilla versions
		* < 1.7.  Unfortunately this property is queried early enough in the
		* Browser creation process that the Mozilla version being used is not
		* yet determined.  However it is known if XULRunner is being used or not.
		*
		* For now answer a value for this property iff XULRunner is the GRE.
		* If the range of Mozilla versions supported by the Browser is changed
		* in the future to be >= 1.7 then this value can always be answered.
		*/
		if (isXULRunner) propertyValue = profilePath;
	}

	XPCOM.memmove (persistent, new boolean[] {true});
	XPCOM.memmove (_retval, new long /*int*/[] {0}, C.PTR_SIZEOF);
	if (propertyValue != null && propertyValue.length () > 0) {
		long /*int*/[] result = new long /*int*/[1];
		nsEmbedString pathString = new nsEmbedString (propertyValue);
		int rc = XPCOM.NS_NewLocalFile (pathString.getAddress (), 1, result);
		if (rc != XPCOM.NS_OK) Mozilla.error (rc);
		if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
		pathString.dispose ();

		nsILocalFile localFile = new nsILocalFile (result [0]);
		result[0] = 0;
	    rc = localFile.QueryInterface (IIDStore.GetIID (nsIFile.class), result);
		if (rc != XPCOM.NS_OK) Mozilla.error (rc);
		if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NO_INTERFACE);

		XPCOM.memmove (_retval, new long /*int*/[] {result[0]}, C.PTR_SIZEOF);
		localFile.Release ();
		return XPCOM.NS_OK;
	}

	return XPCOM.NS_ERROR_FAILURE;
}
}