1/* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18package org.apache.harmony.luni.util; 19 20public final class URLUtil { 21 22 /** 23 * Canonicalize the path, i.e. remove ".." and "." occurences. 24 * 25 * @param path the path to be canonicalized 26 * @return the canonicalized path 27 */ 28 public static String canonicalizePath(String path) { 29 int dirIndex; 30 31 while ((dirIndex = path.indexOf("/./")) >= 0) { //$NON-NLS-1$ 32 path = path.substring(0, dirIndex + 1) 33 + path.substring(dirIndex + 3); 34 } 35 36 if (path.endsWith("/.")) { //$NON-NLS-1$ 37 path = path.substring(0, path.length() - 1); 38 } 39 40 while ((dirIndex = path.indexOf("/../")) >= 0) { //$NON-NLS-1$ 41 if (dirIndex != 0) { 42 path = path.substring(0, path 43 .lastIndexOf('/', dirIndex - 1)) 44 + path.substring(dirIndex + 3); 45 } else { 46 path = path.substring(dirIndex + 3); 47 } 48 } 49 50 if (path.endsWith("/..") && path.length() > 3) { //$NON-NLS-1$ 51 path = path.substring(0, path.lastIndexOf('/', 52 path.length() - 4) + 1); 53 } 54 return path; 55 } 56} 57