Terrarum/src/net/torvald/terrarum/utils/JsonFetcher.kt

package net.torvald.terrarum.utils

import net.torvald.terrarum.AppLoader.printdbg

/**
 * Created by minjaesong on 2016-02-15.
 */
object JsonFetcher {

    private var jsonString: StringBuffer? = null

    @Throws(java.nio.file.NoSuchFileException::class)
    operator fun invoke(jsonFilePath: String): com.google.gson.JsonObject {
        jsonString = StringBuffer() // reset buffer every time it called
        readJsonFileAsString(jsonFilePath)

        printdbg(this, "Reading JSON $jsonFilePath")

        if (jsonString == null) {
            throw Error("[JsonFetcher] jsonString is null!")
        }

        val jsonParser = com.google.gson.JsonParser()
        val jsonObj = jsonParser.parse(jsonString.toString()).asJsonObject

        return jsonObj
    }

    @Throws(java.nio.file.NoSuchFileException::class)
    operator fun invoke(jsonFile: java.io.File): com.google.gson.JsonObject {
        jsonString = StringBuffer() // reset buffer every time it called
        readJsonFileAsString(jsonFile.canonicalPath)

        printdbg(this, "Reading JSON ${jsonFile.path}")

        if (jsonString == null) {
            throw Error("[JsonFetcher] jsonString is null!")
        }

        val jsonParser = com.google.gson.JsonParser()
        val jsonObj = jsonParser.parse(jsonString.toString()).asJsonObject

        return jsonObj
    }

    @Throws(java.nio.file.NoSuchFileException::class)
    private fun readJsonFileAsString(path: String) {
        java.nio.file.Files.lines(java.nio.file.FileSystems.getDefault().getPath(path)).forEach(
                { jsonString!!.append(it) }
        ) // JSON does not require line break

    }
}