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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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 com.intellij.ide.util.treeView;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.text.StringUtil;
import java.util.Comparator;
public class AlphaComparator implements Comparator<NodeDescriptor>{
public static final AlphaComparator INSTANCE = new AlphaComparator();
protected AlphaComparator() {
}
@Override
public int compare(NodeDescriptor nodeDescriptor1, NodeDescriptor nodeDescriptor2) {
int weight1 = nodeDescriptor1.getWeight();
int weight2 = nodeDescriptor2.getWeight();
if (weight1 != weight2) {
return weight1 - weight2;
}
String s1 = nodeDescriptor1.toString();
String s2 = nodeDescriptor2.toString();
if (s1 == null) return s2 == null ? 0 : -1;
if (s2 == null) return +1;
//for super natural comparison (IDEA-80435)
Pair<String,String> normalized = normalize(s1, s2);
return StringUtil.naturalCompare(normalized.first, normalized.second);
}
private static Pair<String, String> normalize(String s1, String s2) {
final int minLen = Math.min(s1.length(), s2.length());
final StringBuilder sb1 = new StringBuilder(s1);
final StringBuilder sb2 = new StringBuilder(s2);
for (int i = 0; i < minLen; i++) {
final char ch1 = s1.charAt(i);
final char ch2 = sb2.charAt(i);
if (ch1 == ch2 && ch1 == '-') {
sb1.setCharAt(i, '_');
sb2.setCharAt(i, '_');
} else if (ch1 == '-' && ch2 != '_') {
sb1.setCharAt(i, '_');
} else if (ch2 == '-' && ch1 != '_') {
sb2.setCharAt(i, '_');
}
}
s1 = sb1.toString();
s2 = sb2.toString();
return Pair.create(s1, s2);
}
}
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