[6785] | 1 | /**************************************************************** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
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| 3 | * or more contributor license agreements. See the NOTICE file * |
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| 4 | * distributed with this work for additional information * |
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| 5 | * regarding copyright ownership. The ASF licenses this file * |
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| 6 | * to you under the Apache License, Version 2.0 (the * |
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| 7 | * "License"); you may not use this file except in compliance * |
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| 8 | * with the License. You may obtain a copy of the License at * |
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| 9 | * * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
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| 11 | * * |
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| 12 | * Unless required by applicable law or agreed to in writing, * |
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| 13 | * software distributed under the License is distributed on an * |
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| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
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| 15 | * KIND, either express or implied. See the License for the * |
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| 16 | * specific language governing permissions and limitations * |
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| 17 | * under the License. * |
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| 18 | ****************************************************************/ |
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| 19 | |
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| 20 | package org.apache.james.mime4j.util; |
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| 21 | |
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| 22 | import java.nio.ByteBuffer; |
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| 23 | import java.nio.CharBuffer; |
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| 24 | import java.nio.charset.Charset; |
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| 25 | |
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| 26 | /** |
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| 27 | * Utility methods for converting textual content of a message. |
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| 28 | */ |
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| 29 | public class ContentUtil { |
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| 30 | |
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| 31 | private ContentUtil() { |
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| 32 | } |
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| 33 | |
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| 34 | /** |
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| 35 | * Encodes the specified string into an immutable sequence of bytes using |
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| 36 | * the US-ASCII charset. |
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| 37 | * |
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| 38 | * @param string |
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| 39 | * string to encode. |
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| 40 | * @return encoded string as an immutable sequence of bytes. |
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| 41 | */ |
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| 42 | public static ByteSequence encode(String string) { |
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| 43 | return encode(CharsetUtil.US_ASCII, string); |
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| 44 | } |
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| 45 | |
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| 46 | /** |
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| 47 | * Encodes the specified string into an immutable sequence of bytes using |
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| 48 | * the specified charset. |
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| 49 | * |
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| 50 | * @param charset |
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| 51 | * Java charset to be used for the conversion. |
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| 52 | * @param string |
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| 53 | * string to encode. |
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| 54 | * @return encoded string as an immutable sequence of bytes. |
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| 55 | */ |
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| 56 | public static ByteSequence encode(Charset charset, String string) { |
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| 57 | ByteBuffer encoded = charset.encode(CharBuffer.wrap(string)); |
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| 58 | ByteArrayBuffer bab = new ByteArrayBuffer(encoded.remaining()); |
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| 59 | bab.append(encoded.array(), encoded.position(), encoded.remaining()); |
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| 60 | return bab; |
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| 61 | } |
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| 62 | |
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| 63 | /** |
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| 64 | * Decodes the specified sequence of bytes into a string using the US-ASCII |
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| 65 | * charset. |
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| 66 | * |
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| 67 | * @param byteSequence |
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| 68 | * sequence of bytes to decode. |
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| 69 | * @return decoded string. |
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| 70 | */ |
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| 71 | public static String decode(ByteSequence byteSequence) { |
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| 72 | return decode(CharsetUtil.US_ASCII, byteSequence, 0, byteSequence |
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| 73 | .length()); |
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| 74 | } |
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| 75 | |
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| 76 | /** |
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| 77 | * Decodes the specified sequence of bytes into a string using the specified |
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| 78 | * charset. |
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| 79 | * |
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| 80 | * @param charset |
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| 81 | * Java charset to be used for the conversion. |
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| 82 | * @param byteSequence |
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| 83 | * sequence of bytes to decode. |
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| 84 | * @return decoded string. |
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| 85 | */ |
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| 86 | public static String decode(Charset charset, ByteSequence byteSequence) { |
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| 87 | return decode(charset, byteSequence, 0, byteSequence.length()); |
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| 88 | } |
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| 89 | |
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| 90 | /** |
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| 91 | * Decodes a sub-sequence of the specified sequence of bytes into a string |
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| 92 | * using the US-ASCII charset. |
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| 93 | * |
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| 94 | * @param byteSequence |
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| 95 | * sequence of bytes to decode. |
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| 96 | * @param offset |
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| 97 | * offset into the byte sequence. |
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| 98 | * @param length |
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| 99 | * number of bytes. |
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| 100 | * @return decoded string. |
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| 101 | */ |
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| 102 | public static String decode(ByteSequence byteSequence, int offset, |
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| 103 | int length) { |
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| 104 | return decode(CharsetUtil.US_ASCII, byteSequence, offset, length); |
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| 105 | } |
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| 106 | |
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| 107 | /** |
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| 108 | * Decodes a sub-sequence of the specified sequence of bytes into a string |
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| 109 | * using the specified charset. |
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| 110 | * |
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| 111 | * @param charset |
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| 112 | * Java charset to be used for the conversion. |
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| 113 | * @param byteSequence |
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| 114 | * sequence of bytes to decode. |
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| 115 | * @param offset |
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| 116 | * offset into the byte sequence. |
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| 117 | * @param length |
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| 118 | * number of bytes. |
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| 119 | * @return decoded string. |
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| 120 | */ |
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| 121 | public static String decode(Charset charset, ByteSequence byteSequence, |
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| 122 | int offset, int length) { |
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| 123 | if (byteSequence instanceof ByteArrayBuffer) { |
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| 124 | ByteArrayBuffer bab = (ByteArrayBuffer) byteSequence; |
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| 125 | return decode(charset, bab.buffer(), offset, length); |
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| 126 | } else { |
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| 127 | byte[] bytes = byteSequence.toByteArray(); |
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| 128 | return decode(charset, bytes, offset, length); |
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| 129 | } |
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| 130 | } |
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| 131 | |
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| 132 | private static String decode(Charset charset, byte[] buffer, int offset, |
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| 133 | int length) { |
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| 134 | return charset.decode(ByteBuffer.wrap(buffer, offset, length)) |
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| 135 | .toString(); |
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| 136 | } |
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| 137 | |
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| 138 | } |
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