SCM-Manager/scm-webapp/src/main/java/sonia/scm/cache/CacheConfigurations.java

/**
 * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. Neither the name of SCM-Manager;
 * nor the names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm.cache;

//~--- non-JDK imports --------------------------------------------------------

import com.google.common.collect.Iterators;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

//~--- JDK imports ------------------------------------------------------------

import java.io.IOException;

import java.net.URL;

import java.util.Enumeration;
import java.util.Iterator;

/**
 *
 * @author Sebastian Sdorra
 */
public class CacheConfigurations
{

  /**
   * the logger for CacheConfigurations
   */
  private static final Logger logger =
    LoggerFactory.getLogger(CacheConfigurations.class);

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param loadingClass
   * @param resource
   *
   * @return
   */
  public static Iterator<URL> findModuleResources(Class<?> loadingClass,
    String resource)
  {
    Iterator<URL> it = null;

    try
    {
      ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

      if (classLoader == null)
      {
        classLoader = loadingClass.getClassLoader();
      }

      Enumeration<URL> enm = classLoader.getResources(resource);

      if (enm != null)
      {
        it = Iterators.forEnumeration(enm);
      }

    }
    catch (IOException ex)
    {
      logger.error("could not read module resources", ex);
    }

    if (it == null)
    {
      it = Iterators.emptyIterator();
    }

    return it;
  }
}