org.apache.tomcat.jakartaee.Util Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.tomcat.jakartaee;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.Locale;
public class Util {
/**
* Get the extension of a filename
*
* The extension is the string after the last '{@code .}' in the filename.
* @param filename the name of the file
* @return the extension or an empty string, if no dot is found in the filename
*/
public static String getExtension(String filename) {
// Extract the extension
int lastPeriod = filename.lastIndexOf('.');
if (lastPeriod == -1) {
return "";
}
return filename.substring(lastPeriod + 1).toLowerCase(Locale.ENGLISH);
}
public static void copy(InputStream is, OutputStream os) throws IOException {
byte[] buf = new byte[8192];
int numRead;
while ( (numRead = is.read(buf) ) >= 0) {
os.write(buf, 0, numRead);
}
}
public static String toString(InputStream is, Charset charset) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Util.copy(is, baos);
return new String(baos.toByteArray(), charset);
}
private Util() {
// Hide default constructor. Utility class.
}
}