1 files changed, 0 insertions, 67 deletions
diff --git a/android/support/v7/util/DiffUtil.java b/android/support/v7/util/DiffUtil.java
index ebc33f31..6302666f 100644
--- a/android/support/v7/util/DiffUtil.java
+++ b/android/support/v7/util/DiffUtil.java
@@ -16,7 +16,6 @@
 
 package android.support.v7.util;
 
-import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.VisibleForTesting;
 import android.support.v7.widget.RecyclerView;
@@ -349,72 +348,6 @@ public class DiffUtil {
     }
 
     /**
-     * Callback for calculating the diff between two non-null items in a list.
-     * <p>
-     * {@link Callback} serves two roles - list indexing, and item diffing. ItemCallback handles
-     * just the second of these, which allows separation of code that indexes into an array or List
-     * from the presentation-layer and content specific diffing code.
-     *
-     * @param <T> Type of items to compare.
-     */
-    public abstract static class ItemCallback<T> {
-        /**
-         * Called to check whether two objects represent the same item.
-         * <p>
-         * For example, if your items have unique ids, this method should check their id equality.
-         *
-         * @param oldItem The item in the old list.
-         * @param newItem The item in the new list.
-         * @return True if the two items represent the same object or false if they are different.
-         *
-         * @see Callback#areItemsTheSame(int, int)
-         */
-        public abstract boolean areItemsTheSame(@NonNull T oldItem, @NonNull T newItem);
-
-        /**
-         * Called to check whether two items have the same data.
-         * <p>
-         * This information is used to detect if the contents of an item have changed.
-         * <p>
-         * This method to check equality instead of {@link Object#equals(Object)} so that you can
-         * change its behavior depending on your UI.
-         * <p>
-         * For example, if you are using DiffUtil with a
-         * {@link android.support.v7.widget.RecyclerView.Adapter RecyclerView.Adapter}, you should
-         * return whether the items' visual representations are the same.
-         * <p>
-         * This method is called only if {@link #areItemsTheSame(T, T)} returns {@code true} for
-         * these items.
-         *
-         * @param oldItem The item in the old list.
-         * @param newItem The item in the new list.
-         * @return True if the contents of the items are the same or false if they are different.
-         *
-         * @see Callback#areContentsTheSame(int, int)
-         */
-        public abstract boolean areContentsTheSame(@NonNull T oldItem, @NonNull T newItem);
-
-        /**
-         * When {@link #areItemsTheSame(T, T)} returns {@code true} for two items and
-         * {@link #areContentsTheSame(T, T)} returns false for them, this method is called to
-         * get a payload about the change.
-         * <p>
-         * For example, if you are using DiffUtil with {@link RecyclerView}, you can return the
-         * particular field that changed in the item and your
-         * {@link android.support.v7.widget.RecyclerView.ItemAnimator ItemAnimator} can use that
-         * information to run the correct animation.
-         * <p>
-         * Default implementation returns {@code null}.
-         *
-         * @see Callback#getChangePayload(int, int)
-         */
-        @SuppressWarnings({"WeakerAccess", "unused"})
-        public Object getChangePayload(@NonNull T oldItem, @NonNull T newItem) {
-            return null;
-        }
-    }
-
-    /**
      * Snakes represent a match between two lists. It is optionally prefixed or postfixed with an
      * add or remove operation. See the Myers' paper for details.
      */