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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. 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_1_1.html
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* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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*/
package org.glassfish.admin.amx.util;
import java.io.InputStream;
import java.io.InputStreamReader;
/**
Reads a line from the specified input stream, outputs
the prompt to System.out.
*/
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());
}
}