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org.apache.commons.net.io.ToNetASCIIOutputStream	71%	88%

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

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