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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.std.StdSerializer;
import io.serverlessworkflow.api.functions.FunctionRef;
import java.io.IOException;

public class FunctionRefSerializer extends StdSerializer {

  public FunctionRefSerializer() {
    this(FunctionRef.class);
  }

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

  @Override
  public void serialize(FunctionRef functionRef, JsonGenerator gen, SerializerProvider provider)
      throws IOException {

    if (functionRef != null) {
      if ((functionRef.getArguments() == null || functionRef.getArguments().isEmpty())
          && (functionRef.getSelectionSet() == null || functionRef.getSelectionSet().isEmpty())
          && (functionRef.getInvoke() == null
              || functionRef.getInvoke().equals(FunctionRef.Invoke.SYNC))
          && functionRef.getRefName() != null
          && functionRef.getRefName().length() > 0) {
        gen.writeString(functionRef.getRefName());
      } else {
        gen.writeStartObject();

        if (functionRef.getRefName() != null && functionRef.getRefName().length() > 0) {
          gen.writeStringField("refName", functionRef.getRefName());
        }

        if (functionRef.getArguments() != null && !functionRef.getArguments().isEmpty()) {
          gen.writeObjectField("arguments", functionRef.getArguments());
        }

        if (functionRef.getSelectionSet() != null && functionRef.getSelectionSet().length() > 0) {
          gen.writeStringField("selectionSet", functionRef.getSelectionSet());
        }

        if (functionRef.getInvoke() != null) {
          gen.writeStringField("invoke", functionRef.getInvoke().value());
        }

        gen.writeEndObject();
      }
    }
  }
}