| /** |
| * 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.camel.web.util; |
| |
| import java.util.BitSet; |
| |
| public final class UriCharactersEncoder { |
| private static BitSet unsafeCharacters; |
| private static final char[] HEX_DIGITS = { |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; |
| |
| static { |
| unsafeCharacters = new BitSet(256); |
| unsafeCharacters.set(' '); |
| unsafeCharacters.set('"'); |
| unsafeCharacters.set('<'); |
| unsafeCharacters.set('>'); |
| unsafeCharacters.set('#'); |
| unsafeCharacters.set('%'); |
| unsafeCharacters.set('{'); |
| unsafeCharacters.set('}'); |
| unsafeCharacters.set('|'); |
| unsafeCharacters.set('\\'); |
| unsafeCharacters.set('^'); |
| unsafeCharacters.set('~'); |
| unsafeCharacters.set('['); |
| unsafeCharacters.set(']'); |
| unsafeCharacters.set('`'); |
| unsafeCharacters.set('/'); |
| unsafeCharacters.set('$'); |
| } |
| |
| private UriCharactersEncoder() { |
| // util class |
| } |
| |
| public static String encode(String s) { |
| int n = s.length(); |
| if (n == 0) { |
| return s; |
| } |
| |
| // First check whether we actually need to encode |
| char chars[] = s.toCharArray(); |
| for (int i = 0;;) { |
| // just deal with the ascii character |
| if (chars[i] > 0 && chars[i] < 128) { |
| if (unsafeCharacters.get(chars[i])) { |
| break; |
| } |
| } |
| if (++i >= chars.length) { |
| return s; |
| } |
| } |
| |
| // okay there are some unsafe characters so we do need to encode |
| StringBuilder sb = new StringBuilder(); |
| for (char ch : chars) { |
| if (ch > 0 && ch < 128 && unsafeCharacters.get(ch)) { |
| appendEscape(sb, (byte)ch); |
| } else { |
| sb.append(ch); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| private static void appendEscape(StringBuilder sb, byte b) { |
| sb.append('%'); |
| sb.append(HEX_DIGITS[(b >> 4) & 0x0f]); |
| sb.append(HEX_DIGITS[(b >> 0) & 0x0f]); |
| } |
| |
| } |