/*
    * 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.logging.log4j.core.helpers;
  
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.status.StatusLogger;
  
  import java.io.File;
  import java.io.UnsupportedEncodingException;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URL;
  import java.net.URLDecoder;
  
  /**
   * File utilities.
   */
  public final class FileUtils {
  
      /** Constant for the file URL protocol.*/
      private static final String PROTOCOL_FILE = "file";
  
      private static final String JBOSS_FILE = "vfsfile";
  
      private static final Logger logger = StatusLogger.getLogger();
  
      private FileUtils() {
      }
  
        /**
       * Tries to convert the specified URL to a file object. If this fails,
       * <b>null</b> is returned.
       *
       * @param uri the URI
       * @return the resulting file object
       */
      public static File fileFromURI(URI uri) {
          if (uri == null || (uri.getScheme() != null &&
              (!PROTOCOL_FILE.equals(uri.getScheme()) && !JBOSS_FILE.equals(uri.getScheme())))) {
              return null;
          } else {
              if (uri.getScheme() == null) {
                  try {
                      uri = new File(uri.getPath()).toURI();
                  } catch (Exception ex) {
                      logger.warn("Invalid URI " + uri);
                      return null;
                  }
              }
              try {
                  return new File(URLDecoder.decode(uri.toURL().getFile(), "UTF8"));
              } catch (MalformedURLException ex) {
                  logger.warn("Invalid URL " + uri, ex);
              } catch (UnsupportedEncodingException uee) {
                  logger.warn("Invalid encoding: UTF8", uee);
              }
              return null;
          }
      }
  
      public static boolean isFile(URL url) {
          return url != null && (url.getProtocol().equals(PROTOCOL_FILE) || url.getProtocol().equals(JBOSS_FILE));
      }
  }