ca.uhn.hl7v2.hoh.util.IOUtils Maven / Gradle / Ivy
package ca.uhn.hl7v2.hoh.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Utilities for dealing with IO
*/
public class IOUtils {
public static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Non instantiable
*/
private IOUtils() {
super();
}
/**
*
* Copy bytes from a large (over 2GB) InputStream to an
* OutputStream.
*
*
* This method is based on an implementation from Apache Commons-IO
*
*
* @param input
* the InputStream to read from
* @param output
* the OutputStream to write to
* @return the number of bytes copied
* @throws NullPointerException
* if the input or output is null
* @throws IOException
* if an I/O error occurs
*/
public static long copy(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
public static long copyWhileDataAvailable(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (input.available() > 0 && -1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Read a classpath resource into a byte array
*/
public static byte[] readClasspathIntoByteArray(String theString) throws IOException {
InputStream res = IOUtils.class.getResourceAsStream(theString);
return readInputStreamIntoByteArray(res);
}
/**
* Read an entire input stream into a byte array
*/
public static byte[] readInputStreamIntoByteArray(InputStream res) throws IOException {
java.io.ByteArrayOutputStream bos = new ByteArrayOutputStream();
copy(res, bos);
return bos.toByteArray();
}
public static byte[] readInputStreamIntoByteArraWhileDataAvailable(InputStream res) throws IOException {
java.io.ByteArrayOutputStream bos = new ByteArrayOutputStream();
copyWhileDataAvailable(res, bos);
return bos.toByteArray();
}
}