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Kafka Compatible Schema Registry

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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * 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.rest;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Objects;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class SchemaReference implements Comparable {
    String name;
    String subject;
    Integer version;

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        SchemaReference that = (SchemaReference) o;
        return Objects.equals(name, that.name)
            && Objects.equals(subject, that.subject)
            && Objects.equals(version, that.version);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, subject, version);
    }

    @Override
    public int compareTo(SchemaReference that) {
        int result = this.subject.compareTo(that.subject);
        if (result != 0) {
            return result;
        }
        result = this.version - that.version;
        return result;
    }

    public void updateHash(MessageDigest md) {
        if (name != null) {
            md.update(name.getBytes(StandardCharsets.UTF_8));
        }
        if (subject != null) {
            md.update(subject.getBytes(StandardCharsets.UTF_8));
        }
        if (version != null) {
            md.update(ByteBuffer.allocate(4).putInt(version).array());
        }
    }

}