/*
    * 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.http4;
  
  import java.io.IOException;
  
  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;
  import org.apache.http.Header;
  import org.apache.http.HttpResponse;
  import org.apache.http.entity.ContentType;
  import org.apache.http.protocol.HTTP;
  
  /**
   * Creates {@code FileContentInfoFactory} instances for http4 provider.
   *
   * @since 2.3
   */
  public class Http4FileContentInfoFactory implements FileContentInfoFactory {
  
      @SuppressWarnings("unchecked")
      @Override
      public FileContentInfo create(final FileContent fileContent) throws FileSystemException {
          String contentMimeType = null;
          String contentCharset = null;
  
          try (final Http4FileObject<Http4FileSystem> http4File = (Http4FileObject<Http4FileSystem>) FileObjectUtils
                  .getAbstractFileObject(fileContent.getFile())) {
              final HttpResponse lastHeadResponse = http4File.getLastHeadResponse();
  
              final Header header = lastHeadResponse.getFirstHeader(HTTP.CONTENT_TYPE);
  
              if (header != null) {
                  final ContentType contentType = ContentType.parse(header.getValue());
                  contentMimeType = contentType.getMimeType();
  
                  if (contentType.getCharset() != null) {
                      contentCharset = contentType.getCharset().name();
                  }
              }
  
              return new DefaultFileContentInfo(contentMimeType, contentCharset);
          } catch (final IOException e) {
              throw new FileSystemException(e);
          }
      }
  }