/*
* 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.local;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileType;
/**
* A parser for Windows file names.
*
* @author <a href="mailto:adammurdoch@apache.org">Adam Murdoch</a>
*/
public class WindowsFileNameParser
extends LocalFileNameParser
{
/**
* Pops the root prefix off a URI, which has had the scheme removed.
*/
protected String extractRootPrefix(final String uri,
final StringBuffer name)
throws FileSystemException
{
return extractWindowsRootPrefix(uri, name);
}
protected FileName createFileName(String scheme, final String rootFile, final String path, final FileType type)
{
return new WindowsFileName(scheme, rootFile, path, type);
}
/**
* Extracts a Windows root prefix from a name.
*/
private String extractWindowsRootPrefix(final String uri,
final StringBuffer name)
throws FileSystemException
{
// Looking for:
// ('/'){0, 3} <letter> ':' '/'
// ['/'] '//' <name> '/' <name> ( '/' | <end> )
// Skip over first 4 (unc) leading '/' chars
int startPos = 0;
int maxlen = Math.min(4, name.length());
for (; startPos < maxlen && name.charAt(startPos) == '/'; startPos++)
{
}
if (startPos == maxlen && name.length() > startPos && name.charAt(startPos + 1) == '/')
{
// Too many '/'
throw new FileSystemException("vfs.provider.local/not-absolute-file-name.error", uri);
}
name.delete(0, startPos);
// Look for drive name
String driveName = extractDrivePrefix(name);
if (driveName != null)
{
return driveName;
}
// Look for UNC name
if (startPos < 2)
{
throw new FileSystemException("vfs.provider.local/not-absolute-file-name.error", uri);
}
return "//" + extractUNCPrefix(uri, name);
}
/**
* Extracts a drive prefix from a path. Leading '/' chars have been removed.
*/
private String extractDrivePrefix(final StringBuffer name)
{
// Looking for <letter> ':' '/'
if (name.length() < 3)
{
// Too short
return null;
}
char ch = name.charAt(0);
if (ch == '/' || ch == ':')
{
// Missing drive letter
return null;
}
if (name.charAt(1) != ':')
{
// Missing ':'
return null;
}
if (name.charAt(2) != '/')
{
// Missing separator
return null;
}
String prefix = name.substring(0, 2);
name.delete(0, 2);
return prefix;
}
/**
* Extracts a UNC name from a path. Leading '/' chars have been removed.
*/
private String extractUNCPrefix(final String uri,
final StringBuffer name)
throws FileSystemException
{
// Looking for <name> '/' <name> ( '/' | <end> )
// Look for first separator
int maxpos = name.length();
int pos = 0;
for (; pos < maxpos && name.charAt(pos) != '/'; pos++)
{
}
pos++;
if (pos >= maxpos)
{
throw new FileSystemException("vfs.provider.local/missing-share-name.error", uri);
}
// Now have <name> '/'
int startShareName = pos;
for (; pos < maxpos && name.charAt(pos) != '/'; pos++)
{
}
if (pos == startShareName)
{
throw new FileSystemException("vfs.provider.local/missing-share-name.error", uri);
}
// Now have <name> '/' <name> ( '/' | <end> )
String prefix = name.substring(0, pos);
name.delete(0, pos);
return prefix;
}
}