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package org.glassfish.jersey.server.internal.inject;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.ws.rs.ext.ParamConverter;
import javax.ws.rs.ext.ParamConverterProvider;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.glassfish.jersey.internal.inject.Providers;

import org.glassfish.hk2.api.ServiceLocator;

/**
 * An aggregate {@link ParamConverterProvider param converter provider} that loads all
 * the registered {@link ParamConverterProvider} implementations.
 * 
 * When invoked, the provider iterates through the registered implementations until
 * it finds the first implementation that returns a non-null {@link ParamConverter param converter},
 * which is subsequently returned from the factory. In case no non-null string reader
 * instance is found, {@code null} is returned from the factory. {@link org.glassfish.jersey.internal.inject.Custom Custom}
 * providers are iterated first, so that user registered providers are preferred against internal jersey providers.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Miroslav Fuksa
 */
@Singleton
public class ParamConverterFactory implements ParamConverterProvider {

    private final List converterProviders;

    @Inject
    ParamConverterFactory(ServiceLocator locator) {
        converterProviders = new ArrayList<>();
        final Set customProviders = Providers.getCustomProviders(locator, ParamConverterProvider.class);
        converterProviders.addAll(customProviders);

        final Set providers = Providers.getProviders(locator, ParamConverterProvider.class);
        providers.removeAll(customProviders);
        converterProviders.addAll(providers);

    }

    @Override
    public  ParamConverter getConverter(Class rawType, Type genericType, Annotation[] annotations) {
        for (ParamConverterProvider provider : converterProviders) {
            @SuppressWarnings("unchecked")
            ParamConverter converter = provider.getConverter(rawType, genericType, annotations);
            if (converter != null) {
                return converter;
            }
        }
        return null;

    }
}