/*
    * 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.maven.plugins.checkstyle.resource;
  
  import javax.inject.Inject;
  
  import java.util.Map;
  
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.codehaus.plexus.resource.DefaultResourceManager;
  import org.codehaus.plexus.resource.PlexusResource;
  import org.codehaus.plexus.resource.ResourceManager;
  import org.codehaus.plexus.resource.loader.ResourceLoader;
  import org.codehaus.plexus.resource.loader.ResourceNotFoundException;
  import org.codehaus.plexus.resource.loader.ThreadContextClasspathResourceLoader;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * License resource manager, to avoid defaulting license to maven-checkstyle-plugin's own license.
   *
   * @since 2.12
   */
  @Component(role = ResourceManager.class, hint = "license", instantiationStrategy = "per-lookup")
  public class LicenseResourceManager extends DefaultResourceManager {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(LicenseResourceManager.class);
  
      @Requirement(role = ResourceLoader.class)
      private Map<String, ResourceLoader> resourceLoaders;
  
      @Inject
      public LicenseResourceManager(Map<String, ResourceLoader> resourceLoaders) {
          super(resourceLoaders);
      }
  
      @Override
      public void addSearchPath(String id, String path) {
          ResourceLoader loader = resourceLoaders.get(id);
  
          if (loader == null) {
              throw new IllegalArgumentException("unknown resource loader: " + id);
          }
  
          loader.addSearchPath(path);
      }
  
      @Override
      public PlexusResource getResource(String name) throws ResourceNotFoundException {
          for (ResourceLoader resourceLoader : resourceLoaders.values()) {
              if (resourceLoader instanceof ThreadContextClasspathResourceLoader
                      && !"config/maven-header.txt".equals(name)) {
                  // MCHECKSTYLE-219: Don't load the license from the plugin
                  // classloader, only allow config/maven-header.txt
                  continue;
              }
  
              try {
                  PlexusResource resource = resourceLoader.getResource(name);
  
                  LOGGER.debug("The resource '" + name + "' was found as " + resource.getName() + ".");
  
                  return resource;
              } catch (ResourceNotFoundException e) {
                  LOGGER.debug("The resource '" + name + "' was not found with resourceLoader "
                          + resourceLoader.getClass().getName() + ".");
              }
          }
  
          throw new ResourceNotFoundException(name);
      }
  }