01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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:
18: package org.apache.harmony.luni.util;
19:
20: public 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.lastIndexOf('/',
43: 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('/', path
52: .length() - 4) + 1);
53: }
54: return path;
55: }
56: }
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