/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
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 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
 
/*
 * $Header: /cvs/glassfish/admin-cli/cli-api/src/java/com/sun/cli/util/LineReaderImpl.java,v 1.4 2007/05/05 05:25:00 tcfujii Exp $
 * $Revision: 1.4 $
 * $Date: 2007/05/05 05:25:00 $
 */
 
package com.sun.cli.util;


import java.io.InputStream;
import java.io.InputStreamReader;


public class LineReaderImpl implements LineReader
{
	final InputStreamReader	mInputStreamReader;
	
		public 
	LineReaderImpl( InputStream inputStream )
	{
		mInputStreamReader	= new InputStreamReader( inputStream );
	}

		public String
	readLine( String prompt )
		throws java.io.IOException
	{
		final StringBuffer	line	= new StringBuffer();
		
		if ( prompt != null )
		{
			System.out.print( prompt );
		}
		
		while ( true )
		{
			final int	value	= mInputStreamReader.read();
			if ( value < 0 )
			{
				if ( line.length() != 0 )
				{
					// read a line but saw EOF before a newline
					break;
				}
				return( null );
			}
			
			final char	theChar	= (char)value;
			if ( theChar == '\n' )
				break;
			
			line.append( theChar );
		}
		
		return( line.toString().trim() );
	}
}