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Apache Commons VFS is a Virtual File System library.
/*
* 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.local;
import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileType;
import org.apache.commons.vfs2.provider.AbstractFileNameParser;
import org.apache.commons.vfs2.provider.UriParser;
import org.apache.commons.vfs2.provider.VfsComponentContext;
/**
* A name parser.
*/
public abstract class LocalFileNameParser extends AbstractFileNameParser {
/**
* Determines if a name is an absolute file name.
*
* @param name The file name.
* @return true if the name is absolute, false otherwise.
*/
public boolean isAbsoluteName(final String name) {
// TODO - this is yucky
final StringBuilder b = new StringBuilder(name);
try {
UriParser.fixSeparators(b);
extractRootPrefix(name, b);
return true;
} catch (final FileSystemException e) {
return false;
}
}
/**
* Pops the root prefix off a URI, which has had the scheme removed.
*
* @param name the URI to modify.
* @param uri the whole URI for error reporting.
* @return the root prefix extracted.
* @throws FileSystemException if an error occurs.
*/
protected abstract String extractRootPrefix(final String uri, final StringBuilder name) throws FileSystemException;
@Override
public FileName parseUri(final VfsComponentContext context, final FileName base, final String uri)
throws FileSystemException {
final StringBuilder name = new StringBuilder();
// Extract the scheme
String scheme = UriParser.extractScheme(uri, name);
if (scheme == null) {
scheme = "file";
}
// Remove encoding, and adjust the separators
UriParser.canonicalizePath(name, 0, name.length(), this);
UriParser.fixSeparators(name);
// Extract the root prefix
final String rootFile = extractRootPrefix(uri, name);
// Normalise the path
final FileType fileType = UriParser.normalisePath(name);
final String path = name.toString();
return createFileName(scheme, rootFile, path, fileType);
}
protected abstract FileName createFileName(String scheme, final String rootFile, final String path,
final FileType type);
}
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