01 /*
02 *
03 * Licensed to the Apache Software Foundation (ASF) under one
04 * or more contributor license agreements. See the NOTICE file
05 * distributed with this work for additional information
06 * regarding copyright ownership. The ASF licenses this file
07 * to you under the Apache License, Version 2.0 (the
08 * "License"); you may not use this file except in compliance
09 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 */
21 package org.apache.qpid.util;
22
23 import java.io.UnsupportedEncodingException;
24
25
26 /**
27 * Strings
28 *
29 */
30
31 public final class Strings
32 {
33
34 private static final byte[] EMPTY = new byte[0];
35
36 private static final ThreadLocal<char[]> charbuf = new ThreadLocal()
37 {
38 public char[] initialValue()
39 {
40 return new char[4096];
41 }
42 };
43
44 public static final byte[] toUTF8(String str)
45 {
46 if (str == null)
47 {
48 return EMPTY;
49 }
50 else
51 {
52 final int size = str.length();
53 char[] chars = charbuf.get();
54 if (size > chars.length)
55 {
56 chars = new char[Math.max(size, 2*chars.length)];
57 charbuf.set(chars);
58 }
59
60 str.getChars(0, size, chars, 0);
61 final byte[] bytes = new byte[size];
62 for (int i = 0; i < size; i++)
63 {
64 if (chars[i] > 127)
65 {
66 try
67 {
68 return str.getBytes("UTF-8");
69 }
70 catch (UnsupportedEncodingException e)
71 {
72 throw new RuntimeException(e);
73 }
74 }
75
76 bytes[i] = (byte) chars[i];
77 }
78 return bytes;
79 }
80 }
81
82 public static final String fromUTF8(byte[] bytes)
83 {
84 try
85 {
86 return new String(bytes, "UTF-8");
87 }
88 catch (UnsupportedEncodingException e)
89 {
90 throw new RuntimeException(e);
91 }
92 }
93
94 }
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