Generate package exports for the JAR only for com.vaadin and com.google

Other (unrebased) packages are not included in the exported packages
list of the manifest.

build/buildhelpers/com/vaadin/buildhelpers/GeneratePackageExports.java

 import java.util.Iterator;
 import java.util.Vector;
 import java.util.jar.Attributes;
+import java.util.jar.Attributes.Name;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 import java.util.jar.Manifest;
-import java.util.jar.Attributes.Name;
 
 /**
  * Generates Export-Packages attribute for OSGi compatible manifest.
  * 
  * Reads the included Java packages in Vaadin JAR, generates a corresponding
- * MANIFEST.MF file, and replaces the dummy one in the JAR with the
- * generated one.
+ * MANIFEST.MF file, and replaces the dummy one in the JAR with the generated
+ * one.
  * 
  * See #3521 for details.
  * 
  * @author magi
  */
 public class GeneratePackageExports {
+    public static final String VAADIN_PACKAGE_PATH_PREFIX = "com/vaadin/";
+    public static final String GOOGLE_PACKAGE_PATH_PREFIX = "com/google/";
+
     public static void main(String[] args) {
         if (args.length < 1) {
-            System.err.println("Invalid number of parameters\n"+
-                               "Usage: java -cp .. GenerateManifest <package.jar>");
+            System.err.println("Invalid number of parameters\n"
+                    + "Usage: java -cp .. GenerateManifest <package.jar>");
             System.exit(1);
         }
 
-        // Open tje JAR
+        // Open the JAR
         String jarFilename = args[0];
         JarFile jar = null;
         try {
             jar = new JarFile(jarFilename);
         } catch (IOException e) {
-            System.err.println("Unable to open JAR '"+jarFilename+"'");
+            System.err.println("Unable to open JAR '" + jarFilename + "'");
             System.exit(1);
         }
 
         HashSet<String> packages = new HashSet<String>();
         for (Enumeration<JarEntry> it = jar.entries(); it.hasMoreElements();) {
             JarEntry entry = it.nextElement();
-            if (entry.getName().startsWith("com") && entry.getName().endsWith(".class")) {
+            if ((entry.getName().startsWith(VAADIN_PACKAGE_PATH_PREFIX) || entry
+                    .getName().startsWith(GOOGLE_PACKAGE_PATH_PREFIX))
+                    && entry.getName().endsWith(".class")) {
                 int lastSlash = entry.getName().lastIndexOf('/');
-                String pkg = entry.getName().substring(0, lastSlash).replace('/', '.');
+                String pkg = entry.getName().substring(0, lastSlash)
+                        .replace('/', '.');
                 packages.add(pkg);
             }
         }
         // List theme packages
         for (Enumeration<JarEntry> it = jar.entries(); it.hasMoreElements();) {
             JarEntry entry = it.nextElement();
-            if (entry.isDirectory() && entry.getName().startsWith("VAADIN/themes")) {
+            if (entry.isDirectory()
+                    && entry.getName().startsWith("VAADIN/themes")) {
                 // Strip ending slash
                 int lastSlash = entry.getName().lastIndexOf('/');
-                String pkg = entry.getName().substring(0, lastSlash).replace('/', '.');
+                String pkg = entry.getName().substring(0, lastSlash)
+                        .replace('/', '.');
                 packages.add(pkg);
             }
         }
-        
+
         // Replacement for the "Export-Package" attribute in the manifest
         String exportPackage = "";
 
         String packageArray[] = new String[packages.size()];
         packages.toArray(packageArray);
         Arrays.sort(packageArray);
-        for (int i=0; i<packageArray.length; i++) {
-            if (i == 0)
+        for (int i = 0; i < packageArray.length; i++) {
+            if (i == 0) {
                 exportPackage = packageArray[i];
-            else
+            } else {
                 exportPackage += ", " + packageArray[i];
+            }
         }
-        
+
         // Read old manifest
         Manifest oldMF = null;
         try {
         } catch (IOException e) {
             e.printStackTrace();
         }
-        
+
         // Read main attributes
         Attributes mainAtts = oldMF.getMainAttributes();
         Vector<String> keys = new Vector<String>(mainAtts.size());
-        for (Iterator<Object> attrit = mainAtts.keySet().iterator(); attrit.hasNext();) {
+        for (Iterator<Object> attrit = mainAtts.keySet().iterator(); attrit
+                .hasNext();) {
             Name name = (Name) attrit.next();
             keys.add(name.toString());
         }
         try {
             jar.close();
         } catch (IOException e) {
-            System.err.println("Unable to close JAR '"+jarFilename+"'");
+            System.err.println("Unable to close JAR '" + jarFilename + "'");
         }
-        
+
         // Put the manifest version as the first line
-        String orderedKeys[] = new String[keys.size()]; 
+        String orderedKeys[] = new String[keys.size()];
         keys.toArray(orderedKeys);
         Arrays.sort(orderedKeys); // Must sort to be able to search
         int mvPos = Arrays.binarySearch(orderedKeys, "Manifest-Version");
         orderedKeys[0] = "Manifest-Version";
 
         // This final ordering is just for esthetic reasons and
-        // in practice unnecessary and will actually be messed up 
+        // in practice unnecessary and will actually be messed up
         // when the 'jar' command reads the manifest
-        Arrays.sort(orderedKeys, 1, orderedKeys.length-1);
+        Arrays.sort(orderedKeys, 1, orderedKeys.length - 1);
 
         // Create the modified manifest
         ManifestWriter manifest = new ManifestWriter();
-        for (int i=0; i<orderedKeys.length; i++) {
+        for (int i = 0; i < orderedKeys.length; i++) {
             // Skip an existing Export-Package attribute
             if (orderedKeys[i].equals("Export-Package")) {
                 // Copy the attribute to the modified manifest
-                manifest.writeAttribute(orderedKeys[i], mainAtts.getValue(orderedKeys[i]));
+                manifest.writeAttribute(orderedKeys[i],
+                        mainAtts.getValue(orderedKeys[i]));
             }
         }
-        
+
         // Add the Export-Package attribute at the end of the manifest.
         // The alternative would be replacing an existing attribute in
         // the loop above, but it's not guaranteed that it exists.
         // before this is done.
         int status = manifest.updateJar(jarFilename);
 
-        if (status != 0)
+        if (status != 0) {
             System.exit(status);
+        }
     }
-    
+
 }