/**
* 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.hadoop.hdfs.util;
import org.apache.hadoop.fs.Path;
import java.util.StringTokenizer;
/**
* Default implementation of PathNameChecker
*
* Checks that the the path does not contain ":" and "//"
* Path should not have relative elements ".", ".."
*/
public class DefaultPathNameChecker implements PathNameChecker {
@Override
public boolean isValidPath(String path) {
// Path must be absolute.
if (!path.startsWith(Path.SEPARATOR)) {
return false;
}
if (path.contains("//")) {
return false;
}
StringTokenizer tokens = new StringTokenizer(path, Path.SEPARATOR);
while(tokens.hasMoreTokens()) {
String element = tokens.nextToken();
if (element.equals("..") ||
element.equals(".") ||
(element.indexOf(":") >= 0)) {
return false;
}
}
return true;
}
}