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/*
* 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 io.microsphere.util;
import java.util.Comparator;
/**
* The {@link Comparator} for {@link CharSequence}
*
* @since 1.0.0
*/
public class CharSequenceComparator implements Comparator {
public static final CharSequenceComparator INSTANCE = new CharSequenceComparator();
private CharSequenceComparator() {
}
@Override
public int compare(CharSequence c1, CharSequence c2) {
String string1 = toString(c1);
String string2 = toString(c2);
return compare(string1, string2);
}
private String toString(CharSequence c) {
return c == null ? null : c.toString();
}
private int compare(String str1, String str2) {
if (str1 == str2) {
return 0;
}
if (str1 == null) {
return -1;
}
if (str2 == null) {
return 1;
}
return str1.compareTo(str2);
}
}