1 files changed, 20 insertions, 0 deletions
diff --git a/src/com/android/contacts/common/util/UriUtils.java b/src/com/android/contacts/common/util/UriUtils.java
index 1ede5f3a..41ef62f6 100644
--- a/src/com/android/contacts/common/util/UriUtils.java
+++ b/src/com/android/contacts/common/util/UriUtils.java
@@ -19,6 +19,8 @@ package com.android.contacts.common.util;
 import android.net.Uri;
 import android.provider.ContactsContract;
 
+import java.util.List;
+
 /**
  * Utility methods for dealing with URIs.
  */
@@ -71,4 +73,22 @@ public class UriUtils {
         }
         return ContactsContract.AUTHORITY.equals(uri.getAuthority()) ? uri : null;
     }
+
+    /**
+     * Parses the given URI to determine the original lookup key of the contact.
+     */
+    public static String getLookupKeyFromUri(Uri lookupUri) {
+        // Would be nice to be able to persist the lookup key somehow to avoid having to parse
+        // the uri entirely just to retrieve the lookup key, but every uri is already parsed
+        // once anyway to check if it is an encoded JSON uri, so this has negligible effect
+        // on performance.
+        if (lookupUri != null && !UriUtils.isEncodedContactUri(lookupUri)) {
+            final List<String> segments = lookupUri.getPathSegments();
+            // This returns the third path segment of the uri, where the lookup key is located.
+            // See {@link android.provider.ContactsContract.Contacts#CONTENT_LOOKUP_URI}.
+            return (segments.size() < 3) ? null : Uri.encode(segments.get(2));
+        } else {
+            return null;
+        }
+    }
 }