yang-comparator/src/main/java/org/onap/modeling/yangkit/comparator/MaxElementsComparator.java


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/*
Copyright 2023 Huawei Technologies

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 org.onap.modeling.yangkit.comparator;

import java.util.ArrayList;
import java.util.List;

import org.yangcentral.yangkit.model.api.stmt.MaxElements;


public class MaxElementsComparator extends CommonYangStatementComparator<MaxElements> {

    /**
     *
     * @param left       left statement
     * @param right      right statement
     * @return
     */
    @Override
    protected List<CompatibilityRule.ChangeInfo> getChangeInfo(MaxElements left, MaxElements right) {
        List<CompatibilityRule.ChangeInfo> changeInfos = new ArrayList<>();
        if (left.isUnbounded() && !right.isUnbounded()) {
            changeInfos.add(CompatibilityRule.ChangeInfo.REDUCE);
        } else if (!left.isUnbounded() && right.isUnbounded()) {
            changeInfos.add(CompatibilityRule.ChangeInfo.EXPAND);
        } else if (!left.isUnbounded() && !right.isUnbounded()) {
            if (left.getValue() < right.getValue()) {
                changeInfos.add(CompatibilityRule.ChangeInfo.EXPAND);
            } else if (left.getValue() > right.getValue()) {
                changeInfos.add(CompatibilityRule.ChangeInfo.REDUCE);
            }
        }
        if (super.getChangeInfo(left, right).contains(CompatibilityRule.ChangeInfo.SEQUENCE_CHANGED)) {
            changeInfos.add(CompatibilityRule.ChangeInfo.SEQUENCE_CHANGED);
        }
        return changeInfos;
    }

    /**
     *
     * @param left       left statement
     * @param right      right statement
     * @param changeInfo
     * @return
     */
    @Override
    protected CompatibilityInfo defaultCompatibility(MaxElements left, MaxElements right,
                                                     CompatibilityRule.ChangeInfo changeInfo) {
        if (changeInfo == CompatibilityRule.ChangeInfo.REDUCE) {
            return new CompatibilityInfo(CompatibilityRule.Compatibility.NBC, "the max-elements is reduced,"
                    + "it's non-backward-compatible.");
        }
        return super.defaultCompatibility(left, right, changeInfo);
    }
}