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/*
* File: LineNumberingOutputStream.java
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* The contents of this file are subject to the terms and conditions of
* the Common Development and Distribution License 1.0 (the "License").
*
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the License by consulting the LICENSE.txt file
* distributed with this file, or by consulting https://oss.oracle.com/licenses/CDDL
*
* 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 LICENSE.txt.
*
* MODIFICATIONS:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*/
package com.oracle.bedrock.runtime.java.container;
import com.oracle.bedrock.annotations.Internal;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* A {@link LineNumberingOutputStream} is an {@link OutputStream} that
* numbers each new line as it is output.
*
* Copyright (c) 2011. All Rights Reserved. Oracle Corporation.
* Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
*
* @author Jonathan Knight
* @author Brian Oliver
*/
@Internal
public class LineNumberingOutputStream extends FilterOutputStream
{
/**
* The next line number to output.
*/
private int m_lineNumber;
/**
* The optional prefix to output with the line numbers.
*
* When null no prefix will be output.
*/
private String m_prefix;
/**
* A flag to indicate if the last output was an EOL.
*/
private boolean m_lastOutputWasEOL;
/**
* Constructs a {@link LineNumberingOutputStream}.
*
* @param outputStream the {@link OutputStream} where output will be sent
* @param prefix the prefix to output with each line number
*/
public LineNumberingOutputStream(OutputStream outputStream,
String prefix)
{
super(outputStream);
m_lineNumber = 1;
m_lastOutputWasEOL = true;
m_prefix = prefix == null ? "" : prefix.trim();
m_prefix = m_prefix.isEmpty() ? m_prefix : m_prefix + ":";
}
/**
* {@inheritDoc}
*/
@Override
public void write(int value) throws IOException
{
if (m_lastOutputWasEOL && value != '\n' && value != '\r')
{
byte[] bytes = String.format("[%-10s%4d]: ", m_prefix, m_lineNumber++).getBytes();
for (byte c : bytes)
{
super.write(c);
}
m_lastOutputWasEOL = false;
}
super.write(value);
if (value == '\n' || value == '\r')
{
m_lastOutputWasEOL = true;
}
}
}