/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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 io.netty.handler.codec.http.multipart;
import java.io.Serializable;
import java.util.Comparator;
final class CaseIgnoringComparator implements Comparator<CharSequence>, Serializable {
private static final long serialVersionUID = 4582133183775373862L;
static final CaseIgnoringComparator INSTANCE = new CaseIgnoringComparator();
private CaseIgnoringComparator() {
}
@Override
public int compare(CharSequence o1, CharSequence o2) {
int o1Length = o1.length();
int o2Length = o2.length();
int min = Math.min(o1Length, o2Length);
for (int i = 0; i < min; i++) {
char c1 = o1.charAt(i);
char c2 = o2.charAt(i);
if (c1 != c2) {
c1 = Character.toUpperCase(c1);
c2 = Character.toUpperCase(c2);
if (c1 != c2) {
c1 = Character.toLowerCase(c1);
c2 = Character.toLowerCase(c2);
if (c1 != c2) {
return c1 - c2;
}
}
}
}
return o1Length - o2Length;
}
private Object readResolve() {
return INSTANCE;
}
}