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Kafka Compatible Schema Registry

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/**
 * 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 io.streamnative.pulsar.handlers.kop.schemaregistry.model;

import lombok.Builder;
import lombok.Data;
import org.jetbrains.annotations.NotNull;

/**
 * Schema key for storing in the schema storage cache.
 */
@Data
@Builder
public class SchemaKey implements Comparable {

    private final String subject;
    private final Integer version;

    @Override
    public int compareTo(@NotNull SchemaKey other) {
        if (this.subject == null && other.subject == null) {
            return 0;
        }
        int compare;
        if (this.subject == null) {
            return -1;
        }
        if (other.subject == null) {
            return 1;
        }
        compare = this.subject.compareTo(other.subject);
        if (compare != 0) {
            return compare;
        }
        return this.version.compareTo(other.version);
    }

}