/*
 * 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.streampipes.connect.iiot.adapters.oi4.serializer;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

import java.io.IOException;
import java.util.Map;

public class PayloadDeserializer extends JsonDeserializer<Map<String, Object>> {

  @Override
  public Map<String, Object> deserialize(JsonParser jp, DeserializationContext ctx) throws IOException {
    JsonNode node = jp.getCodec().readTree(jp);
    if (node.isObject()) {
      return jp.getCodec().treeToValue(node, Map.class);
    } else if (node.isArray() && !node.isEmpty()) {
      return jp.getCodec().treeToValue(node.get(0), Map.class);
    }
    throw new IllegalArgumentException("Unexpected JSON type for payload");
  }
}
