ru.inforion.lab403.common.extensions.json.kt Maven / Gradle / Ivy

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Kotlin extension methods and function for different Java libraries

There is a newer version: 0.3.5

package ru.inforion.lab403.common.extensions

import com.fasterxml.jackson.annotation.JsonTypeInfo
import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.SerializationFeature
import com.fasterxml.jackson.datatype.joda.JodaModule
import com.fasterxml.jackson.module.kotlin.KotlinModule
import com.fasterxml.jackson.module.kotlin.readValue
import java.io.InputStream


fun ObjectMapper.enableTyping() {
    // Java json serializer read long as int if:
    //  - it defined as value: Long but it shorter then long after serialization
    enableDefaultTyping(ObjectMapper.DefaultTyping.OBJECT_AND_NON_CONCRETE, JsonTypeInfo.As.EXISTING_PROPERTY)
}


fun jsonParser(
    comments: Boolean = true,
    indent: Boolean = true,
    typing: Boolean = false
) = ObjectMapper().apply {
    configure(JsonParser.Feature.ALLOW_COMMENTS, comments)
    configure(SerializationFeature.INDENT_OUTPUT, indent)
    registerModule(JodaModule())
    registerModule(KotlinModule())
    if (typing) enableTyping()
}


// https://stackoverflow.com/questions/3907929/should-i-declare-jacksons-objectmapper-as-a-static-field
// using several mappers and get at each time random mapper to prevent heavy deadlocks
val mappers = Array(16) { jsonParser() }


inline fun  String.parseJson(m: ObjectMapper = mappers.random()) = m.readValue(this)

inline fun  InputStream.parseJson(m: ObjectMapper = mappers.random()) = m.readValue(this)

inline fun  Map.parseJson(m: ObjectMapper = mappers.random()): T = m.convertValue(this, T::class.java)

inline fun  Any.parseJsonAsMap(m: ObjectMapper = mappers.random()): T = (this as Map).parseJson(m)

inline fun  Any.parseJsonAsString(m: ObjectMapper = mappers.random()): T = (this as String).parseJson(m)

inline fun  T.writeJson(m: ObjectMapper = mappers.random()) = m.writeValueAsString(this)