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• ParamConverterFactory.java

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org.glassfish.jersey.server.internal.inject.ParamConverterFactory Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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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;

    }
}