org.openl.util.IOUtils Maven / Gradle / Ivy
package org.openl.util;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
/**
* A set of utils to work with general IO streams.
*
* @author Yury Molchan
*/
public class IOUtils {
/**
* Unconditionally close a AutoCloseable.
*
* Equivalent to {@link AutoCloseable#close()}, except any exceptions will be ignored.
*
* @param closeable the object to close, may be null or already closed
*/
public static void closeQuietly(AutoCloseable closeable) {
try {
if (closeable != null) {
closeable.close();
}
} catch (Exception ioe) {
// ignore
}
}
/**
* Copy bytes from InputStream to an OutputStream and close them after.
*
*
* @param input the InputStream to read from
* @param output the OutputStream to write to
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
*/
public static void copyAndClose(InputStream input, OutputStream output) throws IOException {
try {
input.transferTo(output);
} finally {
closeQuietly(input);
closeQuietly(output);
}
}
/**
* Copy bytes from InputStream to an OutputStream.
*
* This method uses the provided buffer, so there is no need to use a BufferedInputStream.
*
* @param input the InputStream to read from
* @param output the OutputStream to write to
* @param buffer the buffer to use for the copy
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
*/
public static void copy(InputStream input, OutputStream output, byte[] buffer) throws IOException {
int n;
while ((n = input.read(buffer)) > 0) {
output.write(buffer, 0, n);
}
output.flush();
}
/**
* Convert the specified CharSequence to an input stream, encoded as bytes using UTF-8 character encoding.
*
* @param input the CharSequence to convert
* @return an input stream
*/
public static InputStream toInputStream(CharSequence input) {
return new ByteArrayInputStream(input.toString().getBytes(StandardCharsets.UTF_8));
}
}