statefun-flink/statefun-flink-core/src/main/java/org/apache/flink/statefun/flink/core/jsonmodule/JsonModuleFactory.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.flink.statefun.flink.core.jsonmodule;

import java.net.URL;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode;
import org.apache.flink.statefun.flink.common.json.Selectors;
import org.apache.flink.statefun.sdk.spi.StatefulFunctionModule;

final class JsonModuleFactory {

  private JsonModuleFactory() {}

  static StatefulFunctionModule create(JsonNode root, URL moduleUrl) {
    final FormatVersion formatVersion = formatVersion(root);
    final JsonNode spec = root.at(Pointers.MODULE_SPEC);

    switch (formatVersion) {
      case v1_0:
        return new JsonModule(spec, moduleUrl);
      default:
        throw new IllegalArgumentException("Unrecognized format version: " + formatVersion);
    }
  }

  private static FormatVersion formatVersion(JsonNode root) {
    String versionStr = Selectors.textAt(root, Pointers.FORMAT_VERSION);
    return FormatVersion.fromString(versionStr);
  }
}