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/*
* Copyright 2006 Open Source Applications 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.unitedinternet.cosmo.util;
/**
* Provides utility methods for working with URL paths.
*/
public class PathUtil {
/**
* Returns the final segment of the path (the portion after the
* final "/"). If the path does not contain a "/", returns the
* empty string.
*/
public static String getBasename(String path) {
if (path == null) {
throw new IllegalArgumentException("null path");
}
int pos = path.lastIndexOf('/');
return pos >= 0 ? path.substring(pos + 1) : "";
}
/**
* Returns the parent path of the given path. Removes the final
* segment and its separator. If the path does not contain more
* than one segment, returns "/".
*/
public static String getParentPath(String path) {
if (path == null) {
throw new IllegalArgumentException("null path");
}
int idx = path.lastIndexOf('/', path.length() - 1);
if (idx < 0) {
return "/";
}
return (idx == 0) ? "/" : path.substring(0, idx);
}
/**
* Returns the initial segment of the given path. If the path is
* simply "/", returns null;
*/
public static String getInitialSegment(String path) {
if (path == null) {
throw new IllegalArgumentException("null path");
}
String segment = path;
if (segment.equals("/")) {
return null;
}
if (segment.startsWith("/")) {
segment = segment.substring(1);
}
int slash = segment.indexOf("/");
if (slash > 0) {
segment = segment.substring(0, slash);
}
return segment;
}
}
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