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Java DSL for easy testing of REST services

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/*
 * Copyright 2019 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
 *
 *        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.restassured.internal.mapping

import com.fasterxml.jackson.core.JsonEncoding
import com.fasterxml.jackson.core.JsonGenerator
import io.restassured.internal.path.json.mapping.JsonPathJackson2ObjectDeserializer
import io.restassured.mapper.ObjectMapper
import io.restassured.mapper.ObjectMapperDeserializationContext
import io.restassured.mapper.ObjectMapperSerializationContext
import io.restassured.path.json.mapper.factory.Jackson2ObjectMapperFactory
import io.restassured.path.json.mapping.JsonPathObjectDeserializer

/**
 * Support for Jackson 2.0 (https://github.com/FasterXML/jackson-core)
 */
class Jackson2Mapper implements ObjectMapper {

  private final Jackson2ObjectMapperFactory factory

  private JsonPathObjectDeserializer deserializer

  Jackson2Mapper(Jackson2ObjectMapperFactory factory) {
    this.factory = factory
    deserializer = new JsonPathJackson2ObjectDeserializer(factory)
  }

  private com.fasterxml.jackson.databind.ObjectMapper createJackson2ObjectMapper(Class cls, String charset) {
    return factory.create(cls, charset)
  }

  String serialize(ObjectMapperSerializationContext context) {
    def object = context.getObjectToSerialize()
    JsonEncoding jsonEncoding = getEncoding(context.getCharset())
    def mapper = createJackson2ObjectMapper(object.getClass(), context.getCharset())
    def stream = new ByteArrayOutputStream()
    JsonGenerator jsonGenerator = mapper.getJsonFactory().createJsonGenerator(stream, jsonEncoding)
    mapper.writeValue(jsonGenerator, object)
    stream.toString(jsonEncoding.getJavaName())
  }

  Object deserialize(ObjectMapperDeserializationContext context) {
    return deserializer.deserialize(context)
  }

  private JsonEncoding getEncoding(String charset) {
    def foundEncoding = JsonEncoding.UTF8
    if (charset != null) {
      for (JsonEncoding encoding : JsonEncoding.values()) {
        if (charset.equals(encoding.getJavaName())) {
          foundEncoding = encoding
          break
        }
      }
    }
    return foundEncoding
  }
}