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package org.apache.catalina.util;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
/**
* Contains commonly needed I/O-related methods
*
* @author Dan Sandberg
*/
public class IOTools {
protected final static int DEFAULT_BUFFER_SIZE=4*1024; //4k
//Ensure non-instantiability
private IOTools() {
}
/**
* Read input from reader and write it to writer until there is no more
* input from reader.
*
* @param reader the reader to read from.
* @param writer the writer to write to.
* @param buf the char array to use as a bufferx
*/
public static void flow( Reader reader, Writer writer, char[] buf )
throws IOException {
int numRead;
while ( (numRead = reader.read(buf) ) >= 0) {
writer.write(buf, 0, numRead);
}
}
/**
* @see flow( Reader, Writer, char[] )
*/
public static void flow( Reader reader, Writer writer )
throws IOException {
char[] buf = new char[DEFAULT_BUFFER_SIZE];
flow( reader, writer, buf );
}
/**
* Read input from input stream and write it to output stream
* until there is no more input from input stream.
*
* @param input stream the input stream to read from.
* @param output stream the output stream to write to.
* @param buf the byte array to use as a buffer
*/
public static void flow( InputStream is, OutputStream os, byte[] buf )
throws IOException {
int numRead;
while ( (numRead = is.read(buf) ) >= 0) {
os.write(buf, 0, numRead);
}
}
/**
* @see flow( Reader, Writer, byte[] )
*/
public static void flow( InputStream is, OutputStream os )
throws IOException {
byte[] buf = new byte[DEFAULT_BUFFER_SIZE];
flow( is, os, buf );
}
}
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