net.dankito.utils.PackageInfo.kt Maven / Gradle / Ivy

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Some basic utils needed in many projects

There is a newer version: 1.0.20

package net.dankito.utils

import org.slf4j.LoggerFactory
import java.io.File
import java.net.URLDecoder


open class PackageInfo {

    companion object {

        fun getAppVersionFromManifest(): String {
            return PackageInfo().getAppVersionFromManifest()
        }


        private val log = LoggerFactory.getLogger(PackageInfo::class.java)

    }


    open fun getAppVersionFromManifest(): String {
        val javaPackage = javaClass.getPackage()

        if(javaPackage != null && javaPackage.implementationVersion != null) {
            return javaPackage.implementationVersion
        }
        else { // when debugging there is no jar (with manifest) to extract version from
            return "Develop"
        }
    }


    /**
     * Returns the path of .jar file where [aClassFromJarFile] is packaged.
     *
     * If not running from a .jar file (e. g. when debugging or running unit tests) returns the path code has
     * been started from
     */
    @JvmOverloads
    open fun getClassJarPath(aClassFromJarFile: Class<*> = PackageInfo::class.java): File? {
        try {
            val path = aClassFromJarFile.protectionDomain.codeSource.location.path
            val decodedPath = URLDecoder.decode(path, "UTF-8")

            return File(decodedPath)
        } catch (e: Exception) {
            log.error("Could not get .jar file current code is running in", e)
        }

        return null
    }

}