| /* |
| * 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 flex.messaging.util; |
| |
| import java.io.BufferedWriter; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * Utility class for URL encoding. |
| * |
| * |
| */ |
| public final class URLEncoder |
| { |
| public static String charset = "UTF8"; |
| |
| private URLEncoder() |
| { |
| } |
| |
| public static String encode(String s) |
| { |
| try |
| { |
| return encode(s, charset); |
| } |
| catch (UnsupportedEncodingException ex) |
| { |
| throw new IllegalArgumentException(charset); |
| } |
| } |
| |
| public static String encode(String s, String enc) throws UnsupportedEncodingException |
| { |
| if (!needsEncoding(s)) |
| { |
| return s; |
| } |
| |
| int length = s.length(); |
| |
| StringBuffer out = new StringBuffer(length); |
| |
| ByteArrayOutputStream buf = new ByteArrayOutputStream(10); // why 10? w3c says so. |
| |
| BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(buf, enc)); |
| |
| for (int i = 0; i < length; i++) |
| { |
| int c = (int)s.charAt(i); |
| if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9' || c == ' ') |
| { |
| if (c == ' ') |
| { |
| c = '+'; |
| } |
| |
| toHex(out, buf.toByteArray()); |
| buf.reset(); |
| |
| out.append((char)c); |
| } |
| else |
| { |
| try |
| { |
| writer.write(c); |
| |
| if (c >= 0xD800 && c <= 0xDBFF && i < length - 1) |
| { |
| int d = (int)s.charAt(i + 1); |
| if (d >= 0xDC00 && d <= 0xDFFF) |
| { |
| writer.write(d); |
| i++; |
| } |
| } |
| |
| writer.flush(); |
| } |
| catch (IOException ex) |
| { |
| throw new IllegalArgumentException(s); |
| } |
| } |
| } |
| try |
| { |
| writer.close(); |
| } |
| catch (IOException ioe) |
| { |
| // Ignore exceptions on close. |
| } |
| |
| toHex(out, buf.toByteArray()); |
| |
| return out.toString(); |
| } |
| |
| private static void toHex(StringBuffer buffer, byte[] b) |
| { |
| for (int i = 0; i < b.length; i++) |
| { |
| buffer.append('%'); |
| |
| char ch = Character.forDigit((b[i] >> 4) & 0xF, 16); |
| if (Character.isLetter(ch)) |
| { |
| ch -= 32; |
| } |
| buffer.append(ch); |
| |
| ch = Character.forDigit(b[i] & 0xF, 16); |
| if (Character.isLetter(ch)) |
| { |
| ch -= 32; |
| } |
| buffer.append(ch); |
| } |
| } |
| |
| private static boolean needsEncoding(String s) |
| { |
| if (s == null) |
| return false; |
| |
| for (int i = 0; i < s.length(); i++) |
| { |
| int c = (int)s.charAt(i); |
| if (!(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9')) |
| return true; |
| // Otherwise, keep going |
| } |
| |
| return false; |
| } |
| } |