Bug 785945 - Add API to get multiple favicons at once from DB (r=mfinkle)

mobile/android/base/db/BrowserDB.java

@@ -12,6 +12,8 @@ import android.database.ContentObserver;
 import android.database.Cursor;
 import android.graphics.drawable.BitmapDrawable;
 
+import java.util.List;
+
 public class BrowserDB {
     public static String ABOUT_PAGES_URL_FILTER = "about:%";
 
@@ -73,6 +75,8 @@ public class BrowserDB {
 
         public BitmapDrawable getFaviconForUrl(ContentResolver cr, String uri);
 
+        public Cursor getFaviconsForUrls(ContentResolver cr, List<String> urls);
+
         public void updateFaviconForUrl(ContentResolver cr, String uri, BitmapDrawable favicon);
 
         public void updateThumbnailForUrl(ContentResolver cr, String uri, BitmapDrawable thumbnail);
@@ -186,6 +190,10 @@ public class BrowserDB {
         return sDb.getFaviconForUrl(cr, uri);
     }
 
+    public static Cursor getFaviconsForUrls(ContentResolver cr, List<String> urls) {
+        return sDb.getFaviconsForUrls(cr, urls);
+    }
+
     public static void updateFaviconForUrl(ContentResolver cr, String uri, BitmapDrawable favicon) {
         sDb.updateFaviconForUrl(cr, uri, favicon);
     }

mobile/android/base/db/LocalBrowserDB.java

@@ -31,6 +31,7 @@ import android.util.Log;
 import java.io.ByteArrayOutputStream;
 import java.util.Collection;
 import java.util.HashMap;
+import java.util.List;
 
 public class LocalBrowserDB implements BrowserDB.BrowserDBIface {
     // Calculate these once, at initialization. isLoggable is too expensive to
@@ -619,6 +620,27 @@ public class LocalBrowserDB implements BrowserDB.BrowserDBIface {
         return new BitmapDrawable(bitmap);
     }
 
+    public Cursor getFaviconsForUrls(ContentResolver cr, List<String> urls) {
+        StringBuffer selection = new StringBuffer();
+        String[] selectionArgs = new String[urls.size()];
+
+        for (int i = 0; i < urls.size(); i++) {
+          final String url = urls.get(i);
+
+          if (i > 0)
+            selection.append(" OR ");
+
+          selection.append(Images.URL + " = ?");
+          selectionArgs[i] = url;
+        }
+
+        return cr.query(mImagesUriWithProfile,
+                        new String[] { Images.URL, Images.FAVICON },
+                        selection.toString(),
+                        selectionArgs,
+                        null);
+    }
+
     public void updateFaviconForUrl(ContentResolver cr, String uri,
             BitmapDrawable favicon) {
         Bitmap bitmap = favicon.getBitmap();