/**
* 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.zookeeper.common;
/**
* Path related utilities
*/
public class PathUtils {
/** validate the provided znode path string
* @param path znode path string
* @param isSequential if the path is being created
* with a sequential flag
* @throws IllegalArgumentException if the path is invalid
*/
public static void validatePath(String path, boolean isSequential)
throws IllegalArgumentException {
validatePath(isSequential? path + "1": path);
}
/**
* Validate the provided znode path string
* @param path znode path string
* @throws IllegalArgumentException if the path is invalid
*/
public static void validatePath(String path) throws IllegalArgumentException {
if (path == null) {
throw new IllegalArgumentException("Path cannot be null");
}
if (path.length() == 0) {
throw new IllegalArgumentException("Path length must be > 0");
}
if (path.charAt(0) != '/') {
throw new IllegalArgumentException(
"Path must start with / character");
}
if (path.length() == 1) { // done checking - it's the root
return;
}
if (path.charAt(path.length() - 1) == '/') {
throw new IllegalArgumentException(
"Path must not end with / character");
}
String reason = null;
char lastc = '/';
char chars[] = path.toCharArray();
char c;
for (int i = 1; i < chars.length; lastc = chars[i], i++) {
c = chars[i];
if (c == 0) {
reason = "null character not allowed @" + i;
break;
} else if (c == '/' && lastc == '/') {
reason = "empty node name specified @" + i;
break;
} else if (c == '.' && lastc == '.') {
if (chars[i-2] == '/' &&
((i + 1 == chars.length)
|| chars[i+1] == '/')) {
reason = "relative paths not allowed @" + i;
break;
}
} else if (c == '.') {
if (chars[i-1] == '/' &&
((i + 1 == chars.length)
|| chars[i+1] == '/')) {
reason = "relative paths not allowed @" + i;
break;
}
} else if (c > '\u0000' && c < '\u001f'
|| c > '\u007f' && c < '\u009F'
|| c > '\ud800' && c < '\uf8ff'
|| c > '\ufff0' && c < '\uffff') {
reason = "invalid charater @" + i;
break;
}
}
if (reason != null) {
throw new IllegalArgumentException(
"Invalid path string \"" + path + "\" caused by " + reason);
}
}
}