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

1 files changed, 37 insertions, 3 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/Platform.java b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/Platform.java
index 9fae8d8b3b..39cb197c22 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/Platform.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/Platform.java
@@ -10,8 +10,42 @@
  *******************************************************************************/
 package org.eclipse.swt.internal;
 
+import java.io.*;
+import java.net.*;
+import java.util.jar.*;
+
 public class Platform {
-	
-public static final String PLATFORM = "win32"; //$NON-NLS-1$
-public static final Lock lock = new Lock ();
+
+	public static final String PLATFORM = "win32"; //$NON-NLS-1$
+	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 ();
+		return Library.arch ().equals (attributes.getValue ("SWT-Arch")) && //$NON-NLS-1$
+				Library.os ().equals (attributes.getValue ("SWT-OS")); //$NON-NLS-1$
+	} catch (IOException e) {
+		/* should never happen for a valid SWT jar with the expected manifest values */
+	}
+
+	return false;	
+}
+
 }