content: /*
   * Copyright 2024-2025 the original author or 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
   *
   *      https://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 com.alibaba.cloud.ai.graph.serializer.check_point;
  
  import com.alibaba.cloud.ai.graph.OverAllState;
  import com.alibaba.cloud.ai.graph.checkpoint.Checkpoint;
  import com.alibaba.cloud.ai.graph.serializer.StateSerializer;
  import com.alibaba.cloud.ai.graph.serializer.std.NullableObjectSerializer;
  
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  
  public class CheckPointSerializer implements NullableObjectSerializer<Checkpoint> {
  
  	final StateSerializer stateSerializer;
  
  	public CheckPointSerializer(StateSerializer stateSerializer) {
  		this.stateSerializer = stateSerializer;
  	}
  
  	@Override
  	public void write(Checkpoint object, ObjectOutput out) throws IOException {
  		out.writeUTF(object.getId());
  		writeNullableUTF(object.getNodeId(), out);
  		writeNullableUTF(object.getNextNodeId(), out);
  		OverAllState state = (OverAllState) stateSerializer.stateFactory().apply(object.getState());
  		stateSerializer.write(state, out);
  	}
  
  	@Override
  	public Checkpoint read(ObjectInput in) throws IOException, ClassNotFoundException {
  		return Checkpoint.builder()
  			.id(in.readUTF())
  			.nodeId(readNullableUTF(in).orElse(null))
  			.nextNodeId(readNullableUTF(in).orElse(null))
  			.state((OverAllState) stateSerializer.read(in))
  			.build();
  	}
  
  }
  