/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file.
*/
package org.apache.log4j.lf5.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Provides utility methods for input and output streams.
*
* @author Richard Wan
*/
// Contributed by ThoughtWorks Inc.
public abstract class StreamUtils {
//--------------------------------------------------------------------------
// Constants:
//--------------------------------------------------------------------------
/**
* Default value is 2048.
*/
public static final int DEFAULT_BUFFER_SIZE = 2048;
//--------------------------------------------------------------------------
// Protected Variables:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Private Variables:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Constructors:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Public Methods:
//--------------------------------------------------------------------------
/**
* Copies information from the input stream to the output stream using
* a default buffer size of 2048 bytes.
* @throws java.io.IOException
*/
public static void copy(InputStream input, OutputStream output)
throws IOException {
copy(input, output, DEFAULT_BUFFER_SIZE);
}
/**
* Copies information from the input stream to the output stream using
* the specified buffer size
* @throws java.io.IOException
*/
public static void copy(InputStream input,
OutputStream output,
int bufferSize)
throws IOException {
byte[] buf = new byte[bufferSize];
int bytesRead = input.read(buf);
while (bytesRead != -1) {
output.write(buf, 0, bytesRead);
bytesRead = input.read(buf);
}
output.flush();
}
/**
* Copies information between specified streams and then closes
* both of the streams.
* @throws java.io.IOException
*/
public static void copyThenClose(InputStream input, OutputStream output)
throws IOException {
copy(input, output);
input.close();
output.close();
}
/**
* @returns a byte[] containing the information contained in the
* specified InputStream.
* @throws java.io.IOException
*/
public static byte[] getBytes(InputStream input)
throws IOException {
ByteArrayOutputStream result = new ByteArrayOutputStream();
copy(input, result);
result.close();
return result.toByteArray();
}
//--------------------------------------------------------------------------
// Protected Methods:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Private Methods:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Nested Top-Level Classes or Interfaces
//--------------------------------------------------------------------------
}
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