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Spring JAX-RS Client Proxy

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/**
 * Copyright (c) 2015 the original author or authors
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.jmnarloch.spring.jaxrs.client.cxf;

import com.github.jmnarloch.spring.jaxrs.client.support.JaxRsClientProxyFactory;
import com.github.jmnarloch.spring.jaxrs.client.support.JaxRsClientProxyFactorySupport;
import org.apache.cxf.jaxrs.client.JAXRSClientFactory;

import java.util.LinkedList;
import java.util.List;

/**
 * The CXF {@link JaxRsClientProxyFactory} implementation. It delegates the execution to {@link JAXRSClientFactory}
 * create the proxy instances.
 *
 * @author Jakub Narloch
 */
class CxfClientProxyFactory extends JaxRsClientProxyFactorySupport {

    /**
     * {@inheritDoc}
     */
    @Override
    public  T createClientProxy(Class serviceClass, String serviceUrl) {

        return JAXRSClientFactory.create(serviceUrl, serviceClass, instantiate(getProviders()));
    }

    /**
     * Instantiates the given array of classes and return them as a list. Each of the class need to provide a
     * default constructor.
     *
     * @param classes the classes to instantiate
     * @return the list of instance
     * @throws IllegalStateException if any of the classes could not be instantiated
     */
    private List instantiate(Class[] classes) {
        final List