KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > sun > cli > util > 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-cli/cli-api/src/java/com/sun/cli/util/LineReaderImpl.java,v 1.3 2005/12/25 03:45:59 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:45:59 $
28  */
29  
30 package com.sun.cli.util;
31
32
33 import java.io.InputStream JavaDoc;
34 import java.io.InputStreamReader JavaDoc;
35
36
37 public class LineReaderImpl implements LineReader
38 {
39     final InputStreamReader JavaDoc mInputStreamReader;
40     
41         public
42     LineReaderImpl( InputStream JavaDoc inputStream )
43     {
44         mInputStreamReader = new InputStreamReader JavaDoc( inputStream );
45     }
46
47         public String JavaDoc
48     readLine( String JavaDoc prompt )
49         throws java.io.IOException JavaDoc
50     {
51         final StringBuffer JavaDoc line = new StringBuffer JavaDoc();
52         
53         if ( prompt != null )
54         {
55             System.out.print( prompt );
56         }
57         
58         while ( true )
59         {
60             final int value = mInputStreamReader.read();
61             if ( value < 0 )
62             {
63                 if ( line.length() != 0 )
64                 {
65                     // read a line but saw EOF before a newline
66 break;
67                 }
68                 return( null );
69             }
70             
71             final char theChar = (char)value;
72             if ( theChar == '\n' )
73                 break;
74             
75             line.append( theChar );
76         }
77         
78         return( line.toString().trim() );
79     }
80 }
81
82
83
84
85
Popular Tags