001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider.http;
018
019import java.io.IOException;
020
021import org.apache.commons.httpclient.Header;
022import org.apache.commons.httpclient.HeaderElement;
023import org.apache.commons.httpclient.methods.HeadMethod;
024import org.apache.commons.vfs2.FileContent;
025import org.apache.commons.vfs2.FileContentInfo;
026import org.apache.commons.vfs2.FileContentInfoFactory;
027import org.apache.commons.vfs2.FileSystemException;
028import org.apache.commons.vfs2.impl.DefaultFileContentInfo;
029import org.apache.commons.vfs2.util.FileObjectUtils;
030
031/**
032 * Creates FileContentInfo instances for HTTP.
033 */
034public class HttpFileContentInfoFactory implements FileContentInfoFactory
035{
036    @Override
037    public FileContentInfo create(final FileContent fileContent) throws FileSystemException
038    {
039        final HttpFileObject httpFile = (HttpFileObject) FileObjectUtils.getAbstractFileObject(fileContent.getFile());
040
041        String contentType = null;
042        String contentEncoding = null;
043
044        HeadMethod headMethod;
045        try
046        {
047            headMethod = httpFile.getHeadMethod();
048        }
049        catch (final IOException e)
050        {
051            throw new FileSystemException(e);
052        }
053        final Header header = headMethod.getResponseHeader("content-type");
054        if (header != null)
055        {
056            final HeaderElement[] element = header.getElements();
057            if (element != null && element.length > 0)
058            {
059                contentType = element[0].getName();
060            }
061        }
062
063        contentEncoding = headMethod.getResponseCharSet();
064
065        return new DefaultFileContentInfo(contentType, contentEncoding);
066    }
067}