/*
 * 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.vfs.provider.local;

import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileType;

/**
 * A general-purpose file name parser.
 *
 * @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
 * @version $Revision: 764356 $ $Date: 2009-04-13 12:06:01 +0800 (一, 2009-04-13) $
 */
public class GenericFileNameParser
    extends LocalFileNameParser
{
    private static final GenericFileNameParser INSTANCE = new GenericFileNameParser();

    /**
     * retrieve a instance to this parser
     *
     * @return the parser
     */
    public static GenericFileNameParser getInstance()
    {
        return INSTANCE;
    }

    /**
     * Pops the root prefix off a URI, which has had the scheme removed.
     */
    protected String extractRootPrefix(final String uri,
                                       final StringBuffer name)
        throws FileSystemException
    {
        // TODO - this class isn't generic at all.  Need to fix this

        // Looking for <sep>
        if (name.length() == 0 || name.charAt(0) != '/')
        {
            throw new FileSystemException("vfs.provider.local/not-absolute-file-name.error", uri);
        }

        // do not strip the separator, BUT also return it ...
        return "/";
    }

    /*
     * ... this is why whe need this:
     * here the rootFilename can only be "/" (see above) put this "/" is also in the pathname
     * so its of no value for the LocalFileName instance
     */
    protected FileName createFileName(String scheme, final String rootFile, final String path, final FileType type)
    {
        return new LocalFileName(scheme, "", path, type);
    }
}
