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org.apache.commons.net.io.ToNetASCIIOutputStream |
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1 | /* |
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2 | * Copyright 2001-2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.net.io; |
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17 | ||
18 | import java.io.FilterOutputStream; |
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19 | import java.io.IOException; |
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20 | import java.io.OutputStream; |
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21 | ||
22 | /*** |
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23 | * This class wraps an output stream, replacing all singly occurring |
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24 | * <LF> (linefeed) characters with <CR><LF> (carriage return |
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25 | * followed by linefeed), which is the NETASCII standard for representing |
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26 | * a newline. |
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27 | * You would use this class to implement ASCII file transfers requiring |
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28 | * conversion to NETASCII. |
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29 | * <p> |
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30 | * <p> |
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31 | * @author Daniel F. Savarese |
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32 | ***/ |
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33 | ||
34 | public final class ToNetASCIIOutputStream extends FilterOutputStream |
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35 | { |
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36 | private boolean __lastWasCR; |
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37 | ||
38 | /*** |
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39 | * Creates a ToNetASCIIOutputStream instance that wraps an existing |
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40 | * OutputStream. |
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41 | * <p> |
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42 | * @param output The OutputStream to wrap. |
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43 | ***/ |
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44 | public ToNetASCIIOutputStream(OutputStream output) |
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45 | { |
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46 | 32 | super(output); |
47 | 32 | __lastWasCR = false; |
48 | 32 | } |
49 | ||
50 | ||
51 | /*** |
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52 | * Writes a byte to the stream. Note that a call to this method |
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53 | * may result in multiple writes to the underlying input stream in order |
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54 | * to convert naked newlines to NETASCII line separators. |
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55 | * This is transparent to the programmer and is only mentioned for |
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56 | * completeness. |
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57 | * <p> |
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58 | * @param ch The byte to write. |
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59 | * @exception IOException If an error occurs while writing to the underlying |
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60 | * stream. |
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61 | ***/ |
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62 | public synchronized void write(int ch) |
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63 | throws IOException |
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64 | { |
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65 | 10 | switch (ch) |
66 | { |
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67 | case '\r': |
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68 | 0 | __lastWasCR = true; |
69 | 0 | out.write('\r'); |
70 | 0 | return ; |
71 | case '\n': |
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72 | 0 | if (!__lastWasCR) |
73 | 0 | out.write('\r'); |
74 | // Fall through |
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75 | default: |
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76 | 10 | __lastWasCR = false; |
77 | 10 | out.write(ch); |
78 | 10 | return ; |
79 | } |
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80 | } |
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81 | ||
82 | ||
83 | /*** |
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84 | * Writes a byte array to the stream. |
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85 | * <p> |
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86 | * @param buffer The byte array to write. |
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87 | * @exception IOException If an error occurs while writing to the underlying |
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88 | * stream. |
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89 | ***/ |
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90 | public synchronized void write(byte buffer[]) |
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91 | throws IOException |
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92 | { |
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93 | 2 | write(buffer, 0, buffer.length); |
94 | 2 | } |
95 | ||
96 | ||
97 | /*** |
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98 | * Writes a number of bytes from a byte array to the stream starting from |
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99 | * a given offset. |
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100 | * <p> |
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101 | * @param buffer The byte array to write. |
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102 | * @param offset The offset into the array at which to start copying data. |
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103 | * @param length The number of bytes to write. |
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104 | * @exception IOException If an error occurs while writing to the underlying |
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105 | * stream. |
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106 | ***/ |
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107 | public synchronized void write(byte buffer[], int offset, class="keyword">int length) |
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108 | throws IOException |
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109 | { |
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110 | 12 | while (length-- > 0) |
111 | 10 | write(buffer[offset++]); |
112 | 2 | } |
113 | ||
114 | } |
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