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    @Override
036    public FileContentInfo create(final FileContent fileContent) throws FileSystemException {
037        final HttpFileObject httpFile = (HttpFileObject) FileObjectUtils.getAbstractFileObject(fileContent.getFile());
038
039        String contentType = null;
040        String contentEncoding = null;
041
042        HeadMethod headMethod;
043        try {
044            headMethod = httpFile.getHeadMethod();
045        } catch (final IOException e) {
046            throw new FileSystemException(e);
047        }
048        final Header header = headMethod.getResponseHeader("content-type");
049        if (header != null) {
050            final HeaderElement[] element = header.getElements();
051            if (element != null && element.length > 0) {
052                contentType = element[0].getName();
053            }
054        }
055
056        contentEncoding = headMethod.getResponseCharSet();
057
058        return new DefaultFileContentInfo(contentType, contentEncoding);
059    }
060}