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Uniform client facade API implementation to perform common operations on top of REST. Implemented for Google AppEngine runtime with Guice.

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/*
 * Copyright (c) 2016 Comvai, s.r.o. All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package org.ctoolkit.restapi.client.appengine;

import com.google.inject.Binding;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.util.Types;
import org.ctoolkit.restapi.client.adapter.ResourceProviderInjector;
import org.ctoolkit.restapi.client.provider.LocalResourceProvider;

import javax.annotation.Nonnull;
import javax.inject.Inject;
import java.lang.reflect.ParameterizedType;

/**
 * The Guice implementation of the injector.
 *
 * @author Aurel Medvegy
 */
class ResourceProviderGuiceInjector
        implements ResourceProviderInjector
{
    private final Injector injector;

    @Inject
    public ResourceProviderGuiceInjector( Injector injector )
    {
        this.injector = injector;
    }

    @Override
    public  LocalResourceProvider getExistingResourceProvider( @Nonnull Class resource )
    {
        LocalResourceProvider provider = null;

        ParameterizedType pt = Types.newParameterizedType( LocalResourceProvider.class, resource );
        Binding binding = injector.getExistingBinding( Key.get( TypeLiteral.get( pt ) ) );

        if ( binding != null )
        {
            //noinspection unchecked
            provider = ( LocalResourceProvider ) binding.getProvider().get();
        }

        return provider;
    }

    @Override
    public  A getExecutorAdaptee( @Nonnull Class adapteeType, @Nonnull Class resource )
    {
        A provider = null;

        ParameterizedType pt = Types.newParameterizedType( adapteeType, resource );
        Binding binding = injector.getExistingBinding( Key.get( TypeLiteral.get( pt ) ) );

        if ( binding != null )
        {
            //noinspection unchecked
            provider = ( A ) binding.getProvider().get();
        }
        return provider;
    }
}