Bug 292062 - Provide a way to dynamically introspect an SWT port info

1 files changed, 40 insertions, 0 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/Platform.java b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/Platform.java
index ef6bfb1040..d0d35b454e 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/Platform.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/cocoa/org/eclipse/swt/internal/Platform.java
@@ -10,8 +10,48 @@
  *******************************************************************************/
 package org.eclipse.swt.internal;
 
+import java.io.*;
+import java.net.*;
+import java.util.jar.*;
+
 public class Platform {
 	
 public static final String PLATFORM = "cocoa"; //$NON-NLS-1$
 public static final Lock lock = new Lock ();
+
+public static boolean IsLoadable () {
+	URL url = Platform.class.getClassLoader ().getResource ("org/eclipse/swt/SWT.class"); //$NON-NLS-1$
+	if (!url.getProtocol ().equals ("jar")) { //$NON-NLS-1$
+		/* SWT is presumably running in a development environment */
+		return true;
+	}
+
+	try {
+		url = new URL (url.getPath ());
+	} catch (MalformedURLException e) {
+		/* should never happen since url's initial path value must be valid */
+	}
+	String path = url.getPath ();
+	int index = path.indexOf ('!');
+	File file = new File (path.substring (0, index));
+
+	try {
+		JarFile jar = new JarFile (file);
+		Manifest manifest = jar.getManifest ();
+		Attributes attributes = manifest.getMainAttributes ();
+
+		/*
+		* Cocoa has a special case since SWT's 32-bit library contains natives for both the
+		* x86 and PPC architectures.
+		*/
+		if (!Library.os ().equals (attributes.getValue ("SWT-OS"))) return false; //$NON-NLS-1$
+		String libraryArch = Library.arch ();
+		String manifestArch = attributes.getValue ("SWT-Arch"); //$NON-NLS-1$
+		return libraryArch.equals (manifestArch) || (manifestArch.equals ("x86") && libraryArch.equals ("ppc")); //$NON-NLS-1$ //$NON-NLS-2$ 
+	} catch (IOException e) {
+		/* should never happen for a valid SWT jar with the expected manifest values */
+	}
+
+	return false;	
+}
 }