My implementation of multiple type in RecyclerView.Adapter, refering to https://medium.com/@dpreussler/writing-better-adapters-1b09758407d2#.dsmf2nwjg, how to avoid if-else in onCreateViewHolder method?

adapters_Animal.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 * interface for all kinds of animals.
 */
public interface Animal extends Visitable {
    String say();
}

adapters_BaseViewHolder.java

package com.example.jianguo.handlertest.adapters;

import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by JianGuo on 9/26/16.
 * Base Viewholder
 */
public abstract class BaseViewHolder<T extends Animal> extends RecyclerView.ViewHolder {

    public BaseViewHolder(View itemView) {
        super(itemView);
    }

    abstract void bind(T item);
}

adapters_Cat.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 */
public class Cat implements Animal {
    @Override
    public String say() {
        return "I'm a cat";
    }

    @Override
    public int type(TypeFactory typeFactory) {
        return typeFactory.type(this);
    }
}

adapters_CatViewHolder.java

package com.example.jianguo.handlertest.adapters;

import android.view.View;
import android.widget.TextView;

import com.example.jianguo.handlertest.R;

/**
 * Created by JianGuo on 9/26/16.
 * {@link android.support.v7.widget.RecyclerView.ViewHolder} for {@link Cat}
 */
public class CatViewHolder extends BaseViewHolder<Cat> {
    public CatViewHolder(View itemView) {
        super(itemView);
    }

    @Override
    void bind(Cat item) {
        TextView tv = (TextView) itemView.findViewById(R.id.item_cat);
        tv.setText(item.say());
    }
}

adapters_Mouse.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 */
public class Mouse implements Animal {

    @Override
    public String say() {
        return "I'm a mouse";
    }

    @Override
    public int type(TypeFactory typeFactory) {
        return typeFactory.type(this);
    }
}

adapters_MouseViewHolder.java

package com.example.jianguo.handlertest.adapters;

import android.view.View;
import android.widget.TextView;

import com.example.jianguo.handlertest.R;

/**
 * Created by JianGuo on 9/26/16.
 * {@link android.support.v7.widget.RecyclerView.ViewHolder} for {@link Mouse}
 */
public class MouseViewHolder extends BaseViewHolder<Mouse> {
    public MouseViewHolder(View itemView) {
        super(itemView);
    }

    @Override
    void bind(Mouse item) {
        TextView tv = (TextView) itemView.findViewById(R.id.item_mouse);
        tv.setText(item.say());
    }


}

adapters_TypeFactory.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 * Factory interface for type.
 */
public interface TypeFactory {
    int type(Mouse mouse);
    int type(Cat cat);
}

adapters_TypeFactoryImpl.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 */
public class TypeFactoryImpl implements TypeFactory {
    @Override
    public int type(Mouse mouse) {
        return mouse.getClass().hashCode();
    }

    @Override
    public int type(Cat cat) {
        return cat.getClass().hashCode();
    }
}

adapters_ViewHolderProvider

package com.example.jianguo.handlertest.adapters;

import android.support.v4.util.Pair;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by JianGuo on 9/26/16.
 * Factory for ViewHolder
 */
public class ViewHolderProvider {
    private static Map<Integer, Pair<Integer, Class<? extends BaseViewHolder>>> viewHolderFactories = new HashMap<>();

    static BaseViewHolder provideViewHolder(ViewGroup parent, int viewType) throws IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException {
        View view = LayoutInflater.from(parent.getContext()).inflate(viewHolderFactories.get(viewType).first, parent, false);
        Constructor<? extends BaseViewHolder> constructor = viewHolderFactories.get(viewType).second.getConstructor(View.class);
        return constructor.newInstance(view);
    }


    static void registerViewHolderFactory(int viewType, Pair<Integer, Class<? extends BaseViewHolder>> pair) {
        viewHolderFactories.put(viewType, pair);
    }

}

adapters_Visitable.java

package com.example.jianguo.handlertest.adapters;

/**
 * Created by JianGuo on 9/26/16.
 * Basic interface for visitor-pattern
 */
public interface Visitable {
    int type(TypeFactory typeFactory);
}

adapters_VisitableAdapter.java

package com.example.jianguo.handlertest.adapters;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.util.Pair;
import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;

import com.example.jianguo.handlertest.R;

import java.lang.reflect.InvocationTargetException;
import java.util.List;

/**
 * Created by JianGuo on 9/26/16.
 * Implementation of {@link android.support.v7.widget.RecyclerView.Adapter} for visitor-pattern.
 */
public class VisitableAdapter extends RecyclerView.Adapter<BaseViewHolder> {
    private List<Animal> mData;
    private Context mContext;


    public VisitableAdapter(@NonNull Context context, @NonNull List<Animal> data) {
        mContext = context;
        mData = data;
        ViewHolderProvider.registerViewHolderFactory(Mouse.class.hashCode(),
                new Pair<Integer, Class<? extends BaseViewHolder>>(R.layout.mouse,
                        MouseViewHolder.class));
        ViewHolderProvider.registerViewHolderFactory(Cat.class.hashCode(),
                new Pair<Integer, Class<? extends BaseViewHolder>>(R.layout.cat,
                        CatViewHolder.class));
    }

    @Override
    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        try {
            return ViewHolderProvider.provideViewHolder(parent, viewType);
        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
            e.printStackTrace();
            throw new IllegalArgumentException("Unsupported viewType: " + viewType);
        }
    }


    @Override
    @SuppressWarnings("unchecked")
    public void onBindViewHolder(BaseViewHolder holder, int position) {
        holder.bind(mData.get(position));
    }


    @Override
    public int getItemViewType(int position) {
        return mData.get(position).type(new TypeFactoryImpl());
    }

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