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Allows to run SQL over JSON

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/*
 * Copyright 2017 Landoop.
 *
 * 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.landoop.json.sql

import com.fasterxml.jackson.annotation.JsonInclude.Include
import com.fasterxml.jackson.databind.{DeserializationFeature, JsonNode, ObjectMapper}
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper

object JacksonJson {
  val mapper = {
    val mapper = new ObjectMapper() with ScalaObjectMapper
    mapper.registerModule(DefaultScalaModule)
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
    mapper.setSerializationInclusion(Include.NON_NULL)
    mapper.setSerializationInclusion(Include.NON_EMPTY)
    mapper
  }

  def toJson[T](value: T): String = mapper.writeValueAsString(value)

  def asJson(value:String):JsonNode = mapper.readTree(value)

  def asJson[T](value: T): JsonNode = mapper.valueToTree(value)


  def fromJson[T](json: String)(implicit m: Manifest[T]): T = mapper.readValue[T](json)


  def toMap[V](json: String)(implicit m: Manifest[V]): Map[String, V] = fromJson[Map[String, V]](json)
}