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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.providers;

import io.streamnative.pulsar.handlers.kop.schemaregistry.model.ParsedSchema;
import io.streamnative.pulsar.handlers.kop.schemaregistry.model.Schema;
import io.streamnative.pulsar.handlers.kop.schemaregistry.model.rest.SchemaReference;
import java.util.List;
import java.util.Map;
import java.util.Optional;

/**
 * A factory for parsed schemas.
 *
 */
public interface SchemaProvider {

    String SCHEMA_VERSION_FETCHER_CONFIG = "schemaVersionFetcher";

    default void configure(Map configs) {
    }

    /**
     * Returns the schema type.
     *
     * @return the schema type
     */
    String schemaType();

    /**
     * Parses a string representing a schema.
     *
     * @param schema the schema
     * @param isNew whether the schema is new
     * @param normalize whether to normalize the schema
     * @return a parsed schema or throw an error
     */
    ParsedSchema parseSchemaOrElseThrow(Schema schema, boolean isNew, boolean normalize);

    /**
     * Parses a string representing a schema.
     *
     * @param schemaString the schema
     * @param references a list of schema references
     * @param isNew whether the schema is new
     * @param normalize whether to normalize the schema
     * @return an optional parsed schema
     */
    default Optional parseSchema(String schemaString,
                                               List references,
                                               boolean isNew,
                                               boolean normalize) {
        try {
            return Optional.of(parseSchemaOrElseThrow(
                Schema.builder()
                    .schema(schemaString)
                    .type(schemaType())
                    .references(references)
                    .build(), isNew, normalize));
        } catch (Exception e) {
            return Optional.empty();
        }
    }
}