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A modification of the OpenDMK JMX remote implementation. Licensed under the Apache Software License v2.0 as permitted by the original CDDL license

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/*
 * JPPF.
 * Copyright (C) 2005-2016 JPPF Team.
 * http://www.jppf.org
 *
 * 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.sun.jmx.remote.protocol.jmxmp;

import java.util.*;

/**
 * Instances of this class load and provide access to environment proivders.
 * @param  the type of the providers to load.
 * @author Laurent Cohen
 */
class EnvironmentProviderHandler {
  /**
   * The client providers.
   */
  private final List providers;

  /**
   * Initialize this handler witht he specified provider class.
   * @param clazz the class of the providers to laod.
   */
  EnvironmentProviderHandler(final Class clazz) {
    providers = Collections.unmodifiableList(loadProviders(clazz));
  }

  /**
   * Load the providers of specified type via SPI.
   * @param clazz the class of the providers to load.
   * @return a list of the loaded providers, possibly empty.
   */
  private List loadProviders(final Class clazz) {
    List list = new ArrayList<>();
    ServiceLoader sl = ServiceLoader.load(clazz);
    Iterator it = sl.iterator();
    boolean end = false;
    while (!end) {
      // hasNext() and next() may throw a ServiceCOnfigurationError
      try {
        if (it.hasNext()) list.add(it.next());
        else end = true;
      } catch(Exception|ServiceConfigurationError e) {
        end = true;
      }
    }
    return list;
  }

  /**
   * Get the client providers.
   * @return a list of privder instances.
   */
  List getProviders() {
    return providers;
  }
}