Kotlin utility class for easily fetching standard system props

SystemProperties.kt

package io.mikael

import java.time.LocalDate

object SystemProperties {

    operator fun get(key: String): String? = System.getProperty(key)

    fun get(key: String, default: String): String = get(key) ?: default
    
    fun get(key: String, supplier: Supplier<String>): String = get(key) ?: supplier.get()

    /**
     * Character that separates components of a file path.
     * This is "/" on UNIX and "\" on Windows.
     */
    val fileSeparator: String?
        get() = get("file.separator")

    /**
     * Sequence used by operating system to separate lines in text files
     */
    val lineSeparator: String?
        get() = get("line.separator")

    /**
     * Path separator character used in `java.class.path`
     */
    val pathSeparator: String?
        get() = get("path.separator")

    /**
     * Path used to find directories and JAR archives containing class files.
     * Elements of the class path are separated by a platform-specific character
     * specified in the `path.separator` property.
     */
    val javaClassPath: String?
        get() = get("java.class.path")

    /**
     * Java class format version number
     */
    val javaClassVersion: String?
        get() = get("java.class.version")

    val javaLibraryPath: String?
        get() = get("java.library.path")

    val javaTemporaryDirectory: String?
        get() = get("java.io.tmpdir")

    val javaCompiler: String?
        get() = get("java.compiler")

    /**
     * Installation directory for Java Runtime Environment (JRE)
     */
    val javaHome: String?
        get() = get("java.home")

    val javaVendor: String?
        get() = get("java.vendor")

    val javaVendorUrl: String?
        get() = get("java.vendor.url")

    val javaVersion: String?
        get() = get("java.version")

    val javaVersionDate: LocalDate?
        get() = get("java.version.date")?.let(LocalDate::parse)

    val javaVmSpecificationVersion: String?
        get() = get("java.vm.specification.version")

    val javaVmSpecificationVendor: String?
        get() = get("java.vm.specification.vendor")

    val javaVmSpecificationName: String?
        get() = get("java.vm.specification.name")

    val javaVmVersion: String?
        get() = get("java.vm.specification.version")

    val javaVmVendor: String?
        get() = get("java.vm.specification.vendor")

    val javaVmName: String?
        get() = get("java.vm.specification.name")

    val javaSpecificationVersion: String?
        get() = get("java.specification.version")

    val javaSpecificationMaintenanceVersion: String?
        get() = get("java.specification.maintenance.version")

    val javaSpecificationVendor: String?
        get() = get("java.specification.vendor")

    val javaSpecificationName: String?
        get() = get("java.specification.name")

    val osArchitecture: String?
        get() = get("os.arch")

    val osName: String?
        get() = get("os.name")

    val osVersion: String?
        get() = get("os.version")

    val userDir: String?
        get() = get("user.dir")

    val userHome: String?
        get() = get("user.home")

    val userName: String?
        get() = get("user.name")

}