/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* Licensed 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;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileType;
/**
* Implementation for layered filesystems.
* <p/>
* Additionally encodes the '!' character.
*/
public class LayeredFileNameParser extends AbstractFileNameParser
{
private final static LayeredFileNameParser INSTANCE = new LayeredFileNameParser();
public static LayeredFileNameParser getInstance()
{
return INSTANCE;
}
public boolean encodeCharacter(char ch)
{
return super.encodeCharacter(ch) || ch == '!';
}
public FileName parseUri(final VfsComponentContext context, FileName base, final String filename) throws FileSystemException
{
final StringBuffer name = new StringBuffer();
// Extract the scheme
final String scheme = UriParser.extractScheme(filename, name);
// Extract the Layered file URI
final String rootUriName = extractRootName(name);
FileName rootUri = null;
if (rootUriName != null)
{
rootUri = context.parseURI(rootUriName);
}
// Decode and normalise the path
UriParser.canonicalizePath(name, 0, name.length(), this);
UriParser.fixSeparators(name);
FileType fileType = UriParser.normalisePath(name);
final String path = name.toString();
return new LayeredFileName(scheme, rootUri, path, fileType);
}
/**
* Pops the root prefix off a URI, which has had the scheme removed.
*/
protected String extractRootName(final StringBuffer uri)
throws FileSystemException
{
// Looking for <name>!<abspath> (staring at the end)
int maxlen = uri.length();
int pos = maxlen - 1;
for (; pos > 0 && uri.charAt(pos) != '!'; pos--)
{
}
if (pos == 0 && uri.charAt(pos) != '!')
{
// not ! found, so take the whole path a root
// e.g. zip:/my/zip/file.zip
pos = maxlen;
}
// Extract the name
String prefix = uri.substring(0, pos);
if (pos < maxlen)
{
uri.delete(0, pos + 1);
}
else
{
uri.setLength(0);
}
return prefix;
}
}