org.hibernate.engine.jdbc.StreamUtils Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
* third-party contributors as indicated by either @author tags or express
* copyright attribution statements applied by the authors. All
* third-party contributions are distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.engine.jdbc;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
/**
* Stream copying utilities
*
* @author Steve Ebersole
*/
public class StreamUtils {
/**
* Default size to use for reading buffers.
*/
public static final int DEFAULT_CHUNK_SIZE = 1024;
/**
* Copy the inputStream to the outputStream. Uses a buffer of the default size ({@link #DEFAULT_CHUNK_SIZE}).
*
* @param inputStream The input stream to read
* @param outputStream The output stream to write to
*
* @return The number of bytes read
*
* @throws IOException If a problem occurred accessing either stream
*/
public static long copy(InputStream inputStream, OutputStream outputStream) throws IOException {
return copy( inputStream, outputStream, DEFAULT_CHUNK_SIZE );
}
/**
* Copy the inputStream to the outputStream using a buffer of the specified size
*
* @param inputStream The input stream to read
* @param outputStream The output stream to write to
* @param bufferSize The size of the buffer to use for reading
*
* @return The number of bytes read
*
* @throws IOException If a problem occurred accessing either stream
*/
public static long copy(InputStream inputStream, OutputStream outputStream, int bufferSize) throws IOException {
final byte[] buffer = new byte[bufferSize];
long count = 0;
int n;
while ( -1 != ( n = inputStream.read( buffer ) ) ) {
outputStream.write( buffer, 0, n );
count += n;
}
return count;
}
/**
* Copy the reader to the writer. Uses a buffer of the default size ({@link #DEFAULT_CHUNK_SIZE}).
*
* @param reader The reader to read from
* @param writer The writer to write to
*
* @return The number of bytes read
*
* @throws IOException If a problem occurred accessing reader or writer
*/
public static long copy(Reader reader, Writer writer) throws IOException {
return copy( reader, writer, DEFAULT_CHUNK_SIZE );
}
/**
* Copy the reader to the writer using a buffer of the specified size
*
* @param reader The reader to read from
* @param writer The writer to write to
* @param bufferSize The size of the buffer to use for reading
*
* @return The number of bytes read
*
* @throws IOException If a problem occurred accessing either stream
*/
public static long copy(Reader reader, Writer writer, int bufferSize) throws IOException {
final char[] buffer = new char[bufferSize];
long count = 0;
int n;
while ( -1 != ( n = reader.read( buffer ) ) ) {
writer.write( buffer, 0, n );
count += n;
}
return count;
}
private StreamUtils() {
}
}