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Java > Open Source Codes > com > sun > appserv > management > util > misc > LineReaderImpl


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23  
24 /*
25  * $Header: /cvs/glassfish/admin-core/mbeanapi/src/java/com/sun/appserv/management/util/misc/LineReaderImpl.java,v 1.3 2005/12/25 03:51:47 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:51:47 $
28  */
29  
30 package com.sun.appserv.management.util.misc;
31
32
33 import java.io.InputStream JavaDoc;
34 import java.io.InputStreamReader JavaDoc;
35
36 /**
37     Reads a line from the specified input stream, outputs
38     the prompt to System.out.
39  */
40 public class LineReaderImpl implements LineReader
41 {
42     final InputStreamReader JavaDoc mInputStreamReader;
43     
44         public
45     LineReaderImpl( InputStream JavaDoc inputStream )
46     {
47         mInputStreamReader = new InputStreamReader JavaDoc( inputStream );
48     }
49
50         public String JavaDoc
51     readLine( String JavaDoc prompt )
52         throws java.io.IOException JavaDoc
53     {
54         final StringBuffer JavaDoc line = new StringBuffer JavaDoc();
55         
56         if ( prompt != null )
57         {
58             System.out.print( prompt );
59         }
60         
61         while ( true )
62         {
63             final int value = mInputStreamReader.read();
64             if ( value < 0 )
65             {
66                 if ( line.length() != 0 )
67                 {
68                     // read a line but saw EOF before a newline
69 break;
70                 }
71                 return( null );
72             }
73             
74             final char theChar = (char)value;
75             if ( theChar == '\n' )
76                 break;
77             
78             line.append( theChar );
79         }
80         
81         return( line.toString().trim() );
82     }
83 }
84
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