/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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
//--------------------------------------------------------------------------
}