Compile paging inline

app/src/main/java/androidx/paging/ContiguousDataSource.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.paging;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.concurrent.Executor;
+
+abstract class ContiguousDataSource<Key, Value> extends DataSource<Key, Value> {
+    @Override
+    boolean isContiguous() {
+        return true;
+    }
+
+    abstract void dispatchLoadInitial(
+            @Nullable Key key,
+            int initialLoadSize,
+            int pageSize,
+            boolean enablePlaceholders,
+            @NonNull Executor mainThreadExecutor,
+            @NonNull PageResult.Receiver<Value> receiver);
+
+    abstract void dispatchLoadAfter(
+            int currentEndIndex,
+            @NonNull Value currentEndItem,
+            int pageSize,
+            @NonNull Executor mainThreadExecutor,
+            @NonNull PageResult.Receiver<Value> receiver);
+
+    abstract void dispatchLoadBefore(
+            int currentBeginIndex,
+            @NonNull Value currentBeginItem,
+            int pageSize,
+            @NonNull Executor mainThreadExecutor,
+            @NonNull PageResult.Receiver<Value> receiver);
+
+    /**
+     * Get the key from either the position, or item, or null if position/item invalid.
+     * <p>
+     * Position may not match passed item's position - if trying to query the key from a position
+     * that isn't yet loaded, a fallback item (last loaded item accessed) will be passed.
+     */
+    abstract Key getKey(int position, Value item);
+
+    boolean supportsPageDropping() {
+        return true;
+    }
+}