/*
 * 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.ftp;

import org.apache.commons.vfs2.provider.*;
import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileType;

/**
 * Implementation for ftp. set default port to 21
 * @author <a href="http://commons.apache.org/vfs/team-list.html">Commons VFS team</a>
 * PATCH for  : https://issues.apache.org/jira/browse/VFS-178
 */
public class FtpFileNameParser extends HostFileNameParser
{
    private static final FtpFileNameParser INSTANCE = new FtpFileNameParser();

    private static final int PORT = 21;

    public FtpFileNameParser()
    {
        super(PORT);
    }

    public static FileNameParser getInstance()
    {
        return INSTANCE;
    }

    public FileName parseUri(final VfsComponentContext context, FileName base, final String filename) throws FileSystemException {
        // FTP URI are generic URI (as per RFC 2396)
        final StringBuilder name = new StringBuilder();

        // Extract the scheme and authority parts
        final Authority auth = extractToPath(filename, name);

        // Extract the queryString
        String queryString = UriParser.extractQueryString(name);
        if (queryString == null && base instanceof URLFileName) {
            queryString = ((URLFileName) base).getQueryString();
        }

        // Decode and normalise the file name
        UriParser.canonicalizePath(name, 0, name.length(), this);
        UriParser.fixSeparators(name);
        FileType fileType = UriParser.normalisePath(name);
        final String path = name.toString();

        return new URLFileName(
            auth.getScheme(),
            auth.getHostName(),
            auth.getPort(),
            getDefaultPort(),
            auth.getUserName(),
            auth.getPassword(),
            path,
            fileType,
            queryString);
    }
}
