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A web service test double for all occasions - standalone edition

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/*
 * Copyright (C) 2012-2023 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.http;

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.Iterator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

public class HttpHeadersJsonDeserializer extends JsonDeserializer {

  @Override
  public HttpHeaders deserialize(JsonParser parser, DeserializationContext context)
      throws IOException {
    JsonNode rootNode = parser.readValueAsTree();
    Iterable> all = rootNode::fields;
    List headers =
        StreamSupport.stream(all.spliterator(), false)
            .map(entry -> createHttpHeader(entry.getKey(), entry.getValue()))
            .collect(Collectors.toList());
    return new HttpHeaders(headers);
  }

  private static HttpHeader createHttpHeader(String key, JsonNode fieldValue) {
    if (fieldValue.isArray()) {
      Iterable all = fieldValue::elements;
      List headerValues =
          StreamSupport.stream(all.spliterator(), false)
              .map(JsonNode::textValue)
              .collect(Collectors.toList());
      return new HttpHeader(key, headerValues);
    } else {
      return new HttpHeader(key, fieldValue.textValue());
    }
  }

  public static  Iterable all(final Iterator underlyingIterator) {
    return () -> underlyingIterator;
  }
}