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/*
 * Copyright (c) 2018 VMware, Inc. All Rights Reserved.
 *
 * This product is licensed to you under the BSD-2 license (the "License").
 * You may not use this product except in compliance with the BSD-2 License.
 *
 * This product may include a number of subcomponents with separate copyright
 * notices and license terms. Your use of these subcomponents is subject to the
 * terms and conditions of the subcomponent's license, as noted in the LICENSE
 * file.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

package com.vmware.ovsdb.protocol.operation.notation.deserializer;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.vmware.ovsdb.jsonrpc.v1.util.JsonUtil;
import com.vmware.ovsdb.protocol.operation.notation.Atom;
import com.vmware.ovsdb.protocol.operation.notation.Pair;

import java.io.IOException;

public class PairDeserializer extends StdDeserializer> {

  protected PairDeserializer() {
    this(null);
  }

  protected PairDeserializer(Class vc) {
    super(vc);
  }

  @Override
  public Pair deserialize(
      JsonParser jp, DeserializationContext ctxt
  ) throws IOException {
    ArrayNode arrayNode = jp.getCodec().readTree(jp);
    if (arrayNode.size() != 2) {
      throw new IOException(
          " should be a 2-element JSON array. Found "
              + arrayNode.size() + " elements");
    }

    Atom key = JsonUtil.treeToValueNoException(
        arrayNode.get(0),
        new TypeReference>() {}
    );
    Atom value = JsonUtil.treeToValueNoException(
        arrayNode.get(1),
        new TypeReference>() {}
    );
    return new Pair<>(key, value);
  }
}