dubbo-error-code-inspector/src/main/java/org/apache/dubbo/errorcode/util/ErrorCodeStringComparator.java

/*
 * 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.dubbo.errorcode.util;

import java.util.Arrays;
import java.util.Comparator;

/**
 * Comparator for Error codes.
 */
public final class ErrorCodeStringComparator implements Comparator<String> {

    private ErrorCodeStringComparator() {}

    private static class Holder {
        static final ErrorCodeStringComparator instance = new ErrorCodeStringComparator();
    }

    public static ErrorCodeStringComparator getInstance() {
        return Holder.instance;
    }

    @Override
    public int compare(String o1, String o2) {
        int[] firstCodeSegments = Arrays.stream(o1.split("-")).mapToInt(Integer::parseInt).toArray();
        int[] secondCodeSegments = Arrays.stream(o2.split("-")).mapToInt(Integer::parseInt).toArray();

        if (firstCodeSegments[0] == secondCodeSegments[0]) {
            return Integer.compare(firstCodeSegments[1], secondCodeSegments[1]);
        }

        return Integer.compare(firstCodeSegments[0], secondCodeSegments[0]);
    }
}