jupyter.kotlin.JavaRuntime.kt Maven / Gradle / Ivy

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Internal part of Kotlin Jupyter API used only inside notebook cells

There is a newer version: 0.12.0-356

package jupyter.kotlin

import org.jetbrains.kotlinx.jupyter.api.JREInfoProvider

object JavaRuntime : JREInfoProvider {
    private const val DEFAULT_VERSION = 8

    override val version by lazy {
        val defaultVersionStr = (if (DEFAULT_VERSION <= 8) "1." else "") + "$DEFAULT_VERSION"
        val version: String? = System.getProperty("java.version")

        val versionParts = version?.split('.')
        if (versionParts.isNullOrEmpty()) {
            defaultVersionStr
        } else if (versionParts[0] == "1") {
            if (versionParts.size > 1) {
                "1.${versionParts[1]}"
            } else {
                defaultVersionStr
            }
        } else {
            versionParts[0]
        }
    }

    override val versionAsInt by lazy {
        val regex = Regex("^(1\\.)?(\\d+)(\\..*)?$")
        val match = regex.matchEntire(version)
        val plainVersion = match?.groupValues?.get(2)
        plainVersion?.toIntOrNull() ?: DEFAULT_VERSION
    }

    override fun assertVersion(
        message: String,
        condition: (Int) -> Boolean,
    ) {
        if (!condition(versionAsInt)) {
            throw AssertionError(message)
        }
    }

    override fun assertVersionAtLeast(minVersion: Int) =
        assertVersion("JRE version should be at least $minVersion") {
            it >= minVersion
        }

    override fun assertVersionInRange(
        minVersion: Int,
        maxVersion: Int,
    ) = assertVersion("JRE version should be in range [$minVersion, $maxVersion]") {
        it in minVersion..maxVersion
    }
}