car-ui-lib/referencedesign/sharedlibrary/src/main/java/com/chassis/car/ui/sharedlibrary/recyclerview/AdapterWrapper.java

/*
 * Copyright (C) 2021 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 com.chassis.car.ui.sharedlibrary.recyclerview;

import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;

import com.android.car.ui.sharedlibrary.oemapis.recyclerview.AdapterDataObserverOEMV1;
import com.android.car.ui.sharedlibrary.oemapis.recyclerview.AdapterOEMV1;
import com.android.car.ui.sharedlibrary.oemapis.recyclerview.RecyclerViewOEMV1;
import com.android.car.ui.sharedlibrary.oemapis.recyclerview.ViewHolderOEMV1;

import com.chassis.car.ui.sharedlibrary.recyclerview.AdapterWrapper.ViewHolderWrapper;

/**
 * Wrapper class that passes the data to car-ui via AdapterOEMV1 interface
 */
public final class AdapterWrapper extends RecyclerView.Adapter<ViewHolderWrapper> {

    @NonNull
    private AdapterOEMV1 mAdapter;

    @NonNull
    private AdapterDataObserverOEMV1 mAdapterDataObserver = new AdapterDataObserverOEMV1() {
        @Override
        public void onChanged() {
            AdapterWrapper.super.notifyDataSetChanged();
        }

        @Override
        public void onItemRangeChanged(int positionStart, int itemCount) {
            AdapterWrapper.super.notifyItemRangeChanged(positionStart, itemCount);
        }

        @Override
        public void onItemRangeChanged(int positionStart, int itemCount,
                @Nullable Object payload) {
            AdapterWrapper.super.notifyItemRangeChanged(positionStart, itemCount, payload);
        }

        @Override
        public void onItemRangeInserted(int positionStart, int itemCount) {
            AdapterWrapper.super.notifyItemRangeInserted(positionStart, itemCount);
        }

        @Override
        public void onItemRangeRemoved(int positionStart, int itemCount) {
            AdapterWrapper.super.notifyItemRangeRemoved(positionStart, itemCount);
        }

        @Override
        public void onItemMoved(int fromPosition, int toPosition) {
            AdapterWrapper.super.notifyItemMoved(fromPosition, toPosition);
        }

        @Override
        public void onStateRestorationPolicyChanged() {
            AdapterWrapper.this.updateStateRestorationPolicy();
        }
    };

    public AdapterWrapper(@NonNull AdapterOEMV1 adapter) {
        this.mAdapter = adapter;
        AdapterWrapper.super.setHasStableIds(adapter.hasStableIds());
        updateStateRestorationPolicy();
    }

    private void updateStateRestorationPolicy() {
        switch (mAdapter.getStateRestorationPolicyInt()) {
            case 2:
                AdapterWrapper.super.setStateRestorationPolicy(
                        RecyclerView.Adapter.StateRestorationPolicy.PREVENT);
                break;
            case 1:
                AdapterWrapper.super.setStateRestorationPolicy(
                        RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY);
                break;
            case 0:
            default:
                AdapterWrapper.super.setStateRestorationPolicy(
                        RecyclerView.Adapter.StateRestorationPolicy.ALLOW);
        }
    }

    @Override
    public int getItemCount() {
        return mAdapter.getItemCount();
    }

    @Override
    public long getItemId(int position) {
        return mAdapter.getItemId(position);
    }

    @Override
    public int getItemViewType(int position) {
        return mAdapter.getItemViewType(position);
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        mAdapter.onAttachedToRecyclerView((RecyclerViewOEMV1) recyclerView);
    }

    @Override
    public void onBindViewHolder(ViewHolderWrapper holder, int position) {
        mAdapter.bindViewHolder(holder.getViewHolder(), position);
    }

    @Override
    public ViewHolderWrapper onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ViewHolderWrapper(mAdapter.createViewHolder(parent, viewType));
    }

    @Override
    public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
        mAdapter.onDetachedFromRecyclerView((RecyclerViewOEMV1) recyclerView);
    }

    @Override
    public boolean onFailedToRecycleView(ViewHolderWrapper holder) {
        return mAdapter.onFailedToRecycleView(holder.getViewHolder());
    }

    @Override
    public void onViewAttachedToWindow(ViewHolderWrapper holder) {
        mAdapter.onViewAttachedToWindow(holder.getViewHolder());
    }

    @Override
    public void onViewDetachedFromWindow(ViewHolderWrapper holder) {
        mAdapter.onViewDetachedFromWindow(holder.getViewHolder());
    }

    @Override
    public void onViewRecycled(ViewHolderWrapper holder) {
        mAdapter.onViewRecycled(holder.getViewHolder());
    }

    @Override
    public void registerAdapterDataObserver(RecyclerView.AdapterDataObserver observer) {
        if (!super.hasObservers()) {
            mAdapter.registerAdapterDataObserver(mAdapterDataObserver);
        }
        super.registerAdapterDataObserver(observer);
    }

    @Override
    public void unregisterAdapterDataObserver(RecyclerView.AdapterDataObserver observer) {
        super.unregisterAdapterDataObserver(observer);
        if (!super.hasObservers()) {
            mAdapter.registerAdapterDataObserver(mAdapterDataObserver);
        }
    }

    /**
     * Holds views for each element in the list.
     */
    public static class ViewHolderWrapper extends RecyclerView.ViewHolder {
        @NonNull
        private ViewHolderOEMV1 mViewHolder;

        ViewHolderWrapper(@NonNull ViewHolderOEMV1 viewHolder) {
            super(viewHolder.getItemView());
            mViewHolder = viewHolder;
            setIsRecyclable(viewHolder.isRecyclable());
        }

        @NonNull
        public ViewHolderOEMV1 getViewHolder() {
            return mViewHolder;
        }
    }
}