Gradle update (#52)

Versions in constants

build.gradle

@@ -1,9 +1,7 @@
 apply plugin: 'com.android.library'
-apply plugin: 'me.tatarka.retrolambda'
 
 android {
-    compileSdkVersion 25
+    compileSdkVersion compileSdk
-    buildToolsVersion '25.0.3'
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -16,7 +14,7 @@ android {
 }
 
 dependencies {
-    provided 'com.android.support:support-annotations:25.4.0'
+    compileOnly "com.android.support:support-annotations:$supportLibraryVersion"
-    provided 'io.reactivex:rxandroid:1.2.1'
+    compileOnly "io.reactivex:rxandroid:$rxAndroidVersion"
-    provided 'io.reactivex:rxjava:1.3.0'
+    compileOnly "io.reactivex:rxjava:$rxJavaVersion"
 }

src/main/java/ru/touchin/roboswag/core/android/support/v7/util/DiffUtil.java

@@ -83,7 +83,6 @@ public class DiffUtil {
      * Calculates the list of update operations that can covert one list into the other one.
      *
      * @param cb The callback that acts as a gateway to the backing list data
-     *
      * @return A DiffResult that contains the information about the edit sequence to convert the
      * old list into the new list.
      */
@@ -100,7 +99,6 @@ public class DiffUtil {
      *
      * @param cb          The callback that acts as a gateway to the backing list data
      * @param detectMoves True if DiffUtil should try to detect moved items, false otherwise.
-     *
      * @return A DiffResult that contains the information about the edit sequence to convert the
      * old list into the new list.
      */
@@ -329,7 +327,6 @@ public class DiffUtil {
          *
          * @param oldItemPosition The position of the item in the old list
          * @param newItemPosition The position of the item in the new list
-         *
          * @return A payload object that represents the change between the two items.
          */
         @Nullable
@@ -560,7 +557,6 @@ public class DiffUtil {
          * @param y          The y position in the matrix (position in the new list)
          * @param snakeIndex The current snake index
          * @param removal    True if we are looking for a removal, false otherwise
-         *
          * @return True if such item is found.
          */
         private boolean findMatchingItem(final int x, final int y, final int snakeIndex,

src/main/java/ru/touchin/roboswag/core/observables/collections/ObservableList.java

@@ -58,6 +58,8 @@ public class ObservableList<TItem> extends ObservableCollection<TItem> implement
     private SameItemsPredicate<TItem> sameItemsPredicate;
     @Nullable
     private ChangePayloadProducer<TItem> changePayloadProducer;
+    @Nullable
+    private ObservableList<TItem> diffUtilsSource;
 
     public ObservableList() {
         super();
@@ -227,9 +229,19 @@ public class ObservableList<TItem> extends ObservableCollection<TItem> implement
         synchronized (this) {
             final List<TItem> oldList = new ArrayList<>(items);
             final List<TItem> newList = new ArrayList<>(newItems);
-            final CollectionsChangesCalculator<TItem> calculator = sameItemsPredicate != null
+            final CollectionsChangesCalculator<TItem> calculator;
-                    ? new DiffCollectionsChangesCalculator<>(oldList, newList, detectMoves, sameItemsPredicate, changePayloadProducer)
+            if (diffUtilsSource != null) {
-                    : new DefaultCollectionsChangesCalculator<>(oldList, newList, false);
+                if (diffUtilsSource.sameItemsPredicate != null) {
+                    calculator = new DiffCollectionsChangesCalculator<>(oldList, newList,
+                            diffUtilsSource.detectMoves, diffUtilsSource.sameItemsPredicate, diffUtilsSource.changePayloadProducer);
+                } else {
+                    calculator = new DefaultCollectionsChangesCalculator<>(oldList, newList, false);
+                }
+            } else if (sameItemsPredicate != null) {
+                calculator = new DiffCollectionsChangesCalculator<>(oldList, newList, detectMoves, sameItemsPredicate, changePayloadProducer);
+            } else {
+                calculator = new DefaultCollectionsChangesCalculator<>(oldList, newList, false);
+            }
             items.clear();
             items.addAll(newItems);
             notifyAboutChanges(calculator.calculateInsertedItems(), calculator.calculateRemovedItems(), calculator.calculateChanges());
@@ -271,7 +283,16 @@ public class ObservableList<TItem> extends ObservableCollection<TItem> implement
      * @return true if diff utils is enabled.
      */
     public boolean diffUtilsIsEnabled() {
-        return sameItemsPredicate != null;
+        return diffUtilsSource != null ? diffUtilsSource.diffUtilsIsEnabled() : sameItemsPredicate != null;
+    }
+
+    /**
+     * Sets observableCollection as a source of diff utils parameters;
+     *
+     * @param diffUtilsSource Source of diff utils parameters.
+     */
+    public void setDiffUtilsSource(@Nullable final ObservableList<TItem> diffUtilsSource) {
+        this.diffUtilsSource = diffUtilsSource;
     }
 
     /**