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


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 streams a Source.
43  *
44  * @author tstich
45  *
46  */
47 public class SourceInputStream extends InputStream JavaDoc {
48
49     private Source source;
50     private int pos;
51
52     /**
53      * Constructs the SourceInputStream.
54      *
55      * @param source
56      */
57     public SourceInputStream(Source source ) {
58         this.source = source;
59         pos = 0;
60     }
61
62     /**
63      * @see java.io.InputStream#read()
64      */
65     public int read() throws IOException JavaDoc {
66         if( pos >= source.length()) return -1;
67         return source.charAt(pos++);
68     }
69
70     /**
71      * @see java.io.InputStream#read(byte[], int, int)
72      */
73     public int read(byte[] arg0, int arg1, int arg2) throws IOException JavaDoc {
74         int next;
75         for( int i=0; i<arg2; i++) {
76             next = read();
77             if( next == -1 ) {
78                 if( i == 0 ) {
79                     return -1;
80                 } else {
81                     return i;
82                 }
83             }
84             arg0[arg1+i] = (byte) next;
85         }
86         return arg2;
87     }
88
89     /**
90      * @see java.io.InputStream#available()
91      */
92     public int available() throws IOException JavaDoc {
93         return source.length() - pos;
94     }
95
96     /**
97      * @see java.io.InputStream#close()
98      */
99     public void close() throws IOException JavaDoc {
100         source.close();
101     }
102
103 }
104
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