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Java > Open Source Codes > org > columba > ristretto > io > MemBufferInputStream


1 /* ***** BEGIN LICENSE BLOCK *****
2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Mozilla Public License Version
5  * 1.1 (the "License"); you may not use this file except in compliance with
6  * the License. You may obtain a copy of the License at
7  * http://www.mozilla.org/MPL/
8  *
9  * Software distributed under the License is distributed on an "AS IS" basis,
10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11  * for the specific language governing rights and limitations under the
12  * License.
13  *
14  * The Original Code is Ristretto Mail API.
15  *
16  * The Initial Developers of the Original Code are
17  * Timo Stich and Frederik Dietz.
18  * Portions created by the Initial Developers are Copyright (C) 2004
19  * All Rights Reserved.
20  *
21  * Contributor(s):
22  *
23  * Alternatively, the contents of this file may be used under the terms of
24  * either the GNU General Public License Version 2 or later (the "GPL"), or
25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26  * in which case the provisions of the GPL or the LGPL are applicable instead
27  * of those above. If you wish to allow use of your version of this file only
28  * under the terms of either the GPL or the LGPL, and not to allow others to
29  * use your version of this file under the terms of the MPL, indicate your
30  * decision by deleting the provisions above and replace them with the notice
31  * and other provisions required by the GPL or the LGPL. If you do not delete
32  * the provisions above, a recipient may use your version of this file under
33  * the terms of any one of the MPL, the GPL or the LGPL.
34  *
35  * ***** END LICENSE BLOCK ***** */
36 package org.columba.ristretto.io;
37
38 import java.io.IOException JavaDoc;
39 import java.io.InputStream JavaDoc;
40
41 /**
42  * InputStream that wraps the MemBuffer.
43  *
44  * @author tstich
45  */
46 public class MemBufferInputStream extends InputStream JavaDoc {
47
48     private MemBuffer buffer;
49     
50     private int pos;
51     
52     /**
53      * Creates the MemBufferInputStream.
54      *
55      * @param buffer
56      */
57     public MemBufferInputStream(MemBuffer buffer) {
58         this.buffer = buffer;
59     }
60
61     /**
62      * @see java.io.InputStream#read()
63      */
64     public int read() throws IOException JavaDoc {
65         if( buffer.size() == pos) return -1;
66         else return buffer.get(pos++);
67     }
68
69     /**
70      * @see java.io.InputStream#available()
71      */
72     public int available() throws IOException JavaDoc {
73         return buffer.size() - pos;
74     }
75     /**
76      * @see java.io.InputStream#close()
77      */
78     public void close() throws IOException JavaDoc {
79         buffer = null;
80     }
81     /**
82      * @see java.io.InputStream#read(byte[], int, int)
83      */
84     public int read(byte[] b, int off, int len) throws IOException JavaDoc {
85         int result = buffer.get(pos, b, off, len);
86         pos += result;
87         if( result == 0 ) return -1;
88         else return result;
89     }
90     /**
91      * @see java.io.InputStream#skip(long)
92      */
93     public long skip(long n) throws IOException JavaDoc {
94         return pos += n;
95     }
96     /**
97      * @return Returns the buffer.
98      */
99     public MemBuffer getBuffer() {
100         return buffer;
101     }
102 }
103
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