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Java SDK for Serverless Workflow Specification

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/*
 * Copyright 2020-Present The Serverless Workflow Specification Authors
 *
 * 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.serverlessworkflow.api.serializers;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.BeanSerializerFactory;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
import io.serverlessworkflow.api.interfaces.Extension;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class ExtensionSerializer extends StdSerializer {

  private Map> extensionsMap = new HashMap<>();

  public ExtensionSerializer() {
    this(Extension.class);
  }

  protected ExtensionSerializer(Class t) {
    super(t);
  }

  public void addExtension(String extensionId, Class extensionClass) {
    this.extensionsMap.put(extensionId, extensionClass);
  }

  @Override
  public void serialize(Extension extension, JsonGenerator gen, SerializerProvider provider)
      throws IOException {

    String extensionId = extension.getExtensionId();

    if (extensionsMap.containsKey(extensionId)) {
      // serialize after setting default bean values...
      BeanSerializerFactory.instance
          .createSerializer(
              provider, TypeFactory.defaultInstance().constructType(extensionsMap.get(extensionId)))
          .serialize(extension, gen, provider);
    } else {
      throw new IllegalArgumentException("Extension handler not registered for: " + extensionId);
    }
  }
}