/* Copyright 2015 Corpuslinguistic working group Humboldt University Berlin.
*
* Licensed 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 annis;
import com.google.common.collect.ComparisonChain;
import java.io.Serializable;
import java.util.Comparator;
/**
* Ordering which is sensitive to case, but two characters with the same
* case are next to each other.
*
* E.g. instead of the ordering "A","B","a" it would be "A","a","B".
*
* This is implemented by first comparating both strings according to their
* case insensitive ordering ({@link String#CASE_INSENSITIVE_ORDER})
* and if both are equal an additional comparision using case sensitive
* ordering is performed.
*
*/
public class CaseSensitiveOrder implements Comparator<String>, Serializable
{
/**
* A static variable containg an instance of the comparator.
*/
public static final Comparator<String> INSTANCE = new CaseSensitiveOrder();
@Override
public int compare(String o1, String o2)
{
return ComparisonChain.start().compare(o1, o2, String.CASE_INSENSITIVE_ORDER).
compare(o1, o2).result();
}
}