/* * Copyright 2015 Dimitry Ivanov ([email protected]) * * 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 ru.noties.storm.pool; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v7.widget.RecyclerView; import android.util.SparseIntArray; /** * Created by Dimitry Ivanov ([email protected]) on 21.02.2015. */ public class RecyclerObjectPool<T> extends RecyclerView.AdapterDataObserver implements ObjectPool<T> { private final AbsObjectPool<T> objectPool; public RecyclerObjectPool(T[] backingArray) { objectPool = new AbsObjectPool<>(backingArray); } @Override public void onChanged() { clear(); } @Override public void onItemRangeChanged(int positionStart, int itemCount) { removeItems(positionStart, itemCount); } @Override public void onItemRangeInserted(int positionStart, int itemCount) { moveItems(positionStart, positionStart + itemCount, itemCount); } @Override public void onItemRangeRemoved(int positionStart, int itemCount) { removeItems(positionStart, itemCount); } @Override public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) { moveItems(fromPosition, toPosition, itemCount); } protected void removeItems(int position, int count) { final SparseIntArray positions = getPositions(); int index; for (int i = position; i < position + count; i++) { index = positions.indexOfKey(i); if (index >= 0) { positions.removeAt(index); } } } protected void moveItems(int fromPosition, int toPosition, int count) { final SparseIntArray positions = getPositions(); int index; int value; for (int i = fromPosition, delta = 0; i < fromPosition + count; i++, delta++) { index = positions.indexOfKey(i); if (index >= 0) { value = positions.valueAt(index); positions.removeAt(index); positions.put(toPosition + delta, value); } } } protected SparseIntArray getPositions() { return objectPool.getPositions(); } @Nullable @Override public T get(int position) { return objectPool.get(position); } @Override public int getPoolSize() { return objectPool.getPoolSize(); } @Override public void store(int position, @NonNull T value) { objectPool.store(position, value); } @Override public void clear() { objectPool.clear(); } }