| /* |
| * 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; |
| |
| /** |
| * 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.normalisePath(name); |
| final String path = name.toString(); |
| |
| return new LayeredFileName(scheme, rootUri, path); |
| } |
| |
| /** |
| * 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--) |
| { |
| } |
| |
| // Extract the name |
| String prefix = uri.substring(0, pos); |
| if (pos < maxlen) |
| { |
| uri.delete(0, pos + 1); |
| } |
| else |
| { |
| uri.setLength(0); |
| } |
| |
| return prefix; |
| } |
| |
| } |