/*
    * 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.commons.vfs2.provider.http;
  
  import java.io.IOException;
  
  import org.apache.commons.httpclient.Header;
  import org.apache.commons.httpclient.HeaderElement;
  import org.apache.commons.httpclient.methods.HeadMethod;
  import org.apache.commons.lang3.ArrayUtils;
  import org.apache.commons.vfs2.FileContent;
  import org.apache.commons.vfs2.FileContentInfo;
  import org.apache.commons.vfs2.FileContentInfoFactory;
  import org.apache.commons.vfs2.FileSystemException;
  import org.apache.commons.vfs2.impl.DefaultFileContentInfo;
  import org.apache.commons.vfs2.util.FileObjectUtils;
  
  /**
   * Creates FileContentInfo instances for HTTP.
   */
  public class HttpFileContentInfoFactory implements FileContentInfoFactory {
  
      @Override
      public FileContentInfo create(final FileContent fileContent) throws FileSystemException {
  
          String contentType = null;
  
          final HeadMethod headMethod;
          try (final HttpFileObject<HttpFileSystem> httpFile = (HttpFileObject<HttpFileSystem>) FileObjectUtils
                  .getAbstractFileObject(fileContent.getFile())) {
              headMethod = httpFile.getHeadMethod();
          } catch (final IOException e) {
              throw new FileSystemException(e);
          }
          final Header header = headMethod.getResponseHeader("content-type");
          if (header != null) {
              final HeaderElement[] element = header.getElements();
              if (!ArrayUtils.isEmpty(element)) {
                  contentType = element[0].getName();
              }
          }
  
          return new DefaultFileContentInfo(contentType, headMethod.getResponseCharSet());
      }
  }