/*
* 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.catalina.webresources;
import java.util.regex.Pattern;
import org.junit.Test;
/*
* This is an absolute performance test. There is no benefit it running it as part of a standard test run so it is
* excluded due to the name starting Tester...
*/
public class TesterAbstractFileResourceSetPerformance {
private static final Pattern UNSAFE_WINDOWS_FILENAME_PATTERN = Pattern.compile(" $|[\"<>]");
private static final int LOOPS = 10_000_000;
/*
* Checking individual characters is about 10 times faster on markt's dev
* PC for typical length file names. The file names need to get to ~65
* characters before the Pattern matching is faster.
*/
@Test
public void testFileNameFiltering() {
long start = System.nanoTime();
for (int i = 0; i < LOOPS; i++) {
UNSAFE_WINDOWS_FILENAME_PATTERN.matcher("testfile.jsp ").find();
}
long end = System.nanoTime();
System.out.println("Regular expression took " + (end - start) + "ns or " +
(end-start)/LOOPS + "ns per iteration");
start = System.nanoTime();
for (int i = 0; i < LOOPS; i++) {
checkForBadCharsArray("testfile.jsp ");
}
end = System.nanoTime();
System.out.println("char[] check took " + (end - start) + "ns or " +
(end-start)/LOOPS + "ns per iteration");
start = System.nanoTime();
for (int i = 0; i < LOOPS; i++) {
checkForBadCharsAt("testfile.jsp ");
}
end = System.nanoTime();
System.out.println("charAt() check took " + (end - start) + "ns or " +
(end-start)/LOOPS + "ns per iteration");
}
private boolean checkForBadCharsArray(String filename) {
char[] chars = filename.toCharArray();
for (char c : chars) {
if (c == '\"' || c == '<' || c == '>') {
return false;
}
}
if (chars[chars.length -1] == ' ') {
return false;
}
return true;
}
private boolean checkForBadCharsAt(String filename) {
final int len = filename.length();
for (int i = 0; i < len; i++) {
char c = filename.charAt(i);
if (c == '\"' || c == '<' || c == '>') {
return false;
}
}
if (filename.charAt(len - 1) == ' ') {
return false;
}
return true;
}
}