content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.core.metamodel.commons;
  
  import java.io.InputStream;
  
  import org.apache.causeway.commons.internal.context._Context;
  
  public class ResourceUtil {
  
      private ResourceUtil(){}
  
      public static InputStream getResourceAsStream(final String resource) {
  
          // try Causeway's classloader
          ClassLoader classLoader = _Context.getDefaultClassLoader();
          InputStream is = classLoader.getResourceAsStream(resource);
          if (is != null) {
              return is;
          }
  
          // try thread's classloader
          classLoader = Thread.currentThread().getContextClassLoader();
          is = classLoader.getResourceAsStream(resource);
          if (is != null) {
              return is;
          }
  
          // try this class' classloader
          classLoader = ResourceUtil.class.getClassLoader();
          is = classLoader.getResourceAsStream(resource);
          if (is != null) {
              return is;
          }
  
          // try system class loader (could return null)
          // have wrapped in a try...catch because for same reason as
          // getResourceURL
          try {
              return ClassLoader.getSystemResourceAsStream(resource);
          } catch (final NullPointerException ignore) {
              return null;
          }
      }
  
  }
  