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package com.mapswithme.maps.adapter;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class RecyclerCompositeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{
@NonNull
private final List<RecyclerView.Adapter<? extends RecyclerView.ViewHolder>> mAdapters = new ArrayList<>();
@NonNull
private final AdapterPositionConverter mIndexConverter;
@SafeVarargs
public RecyclerCompositeAdapter(@NonNull AdapterPositionConverter indexConverter,
@NonNull RecyclerView.Adapter<? extends RecyclerView.ViewHolder>... adapters)
{
mIndexConverter = indexConverter;
mAdapters.addAll(Arrays.asList(adapters));
}
@Override
public final int getItemCount()
{
int total = 0;
for (RecyclerView.Adapter<? extends RecyclerView.ViewHolder> each : mAdapters)
{
total += each.getItemCount();
}
return total;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int absViewType)
{
AdapterIndexAndViewType indexAndViewType = mIndexConverter.toRelativeViewTypeAndAdapterIndex(absViewType);
int adapterIndex = indexAndViewType.getIndex();
int relViewType = indexAndViewType.getRelativeViewType();
RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter = mAdapters.get(adapterIndex);
return adapter.onCreateViewHolder(parent, relViewType);
}
@Override
public int getItemViewType(int position)
{
AdapterIndexAndPosition indexAndPosition = mIndexConverter.toRelativePositionAndAdapterIndex(position);
int adapterIndex = indexAndPosition.getIndex();
RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter = mAdapters.get(adapterIndex);
int relViewType = adapter.getItemViewType(indexAndPosition.getRelativePosition());
int absViewType = mIndexConverter.toAbsoluteViewType(relViewType, adapterIndex);
return absViewType;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
AdapterIndexAndPosition indexAndPosition = mIndexConverter.toRelativePositionAndAdapterIndex(position);
int adapterIndex = indexAndPosition.getIndex();
RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter = mAdapters.get(adapterIndex);
int relPosition = indexAndPosition.getRelativePosition();
bindViewHolder(adapter, holder, relPosition);
}
@SuppressWarnings("unchecked")
private <Holder extends RecyclerView.ViewHolder> void bindViewHolder(@NonNull RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter,
@NonNull Holder holder,
int position)
{
((RecyclerView.Adapter<Holder>) adapter).onBindViewHolder(holder, position);
}
protected static abstract class AbstractAdapterPositionConverter implements AdapterPositionConverter
{
@NonNull
@Override
public AdapterIndexAndPosition toRelativePositionAndAdapterIndex(int absPosition)
{
return getIndexAndPositionItems().get(absPosition);
}
@NonNull
@Override
public AdapterIndexAndViewType toRelativeViewTypeAndAdapterIndex(int absViewType)
{
return getIndexAndViewTypeItems().get(absViewType);
}
@Override
public int toAbsoluteViewType(int relViewType, int adapterIndex)
{
AdapterIndexAndViewType indexAndViewType = new AdapterIndexAndViewTypeImpl(adapterIndex, relViewType);
List<AdapterIndexAndViewType> items = getIndexAndViewTypeItems();
int indexOf = items.indexOf(indexAndViewType);
if (indexOf < 0)
{
throw new IllegalArgumentException("Item " + indexAndViewType + " not found in list : " +
Arrays.toString(items.toArray()));
}
return indexOf;
}
@NonNull
protected abstract List<AdapterIndexAndViewType> getIndexAndViewTypeItems();
@NonNull
protected abstract List<AdapterIndexAndPosition> getIndexAndPositionItems();
}
}
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