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annotate src/name/blackcap/exifwasher/exiv2/Initialize.kt @ 31:3b0546fa0d74

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Add documentation in alternative formats to HTML.
author David Barts <davidb@stashtea.com>
date Sat, 18 Apr 2020 09:08:23 -0700
parents cd2ca4727b7f
children
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1 /*
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2 * Logic common to initializing all external (JNI) classes goes here.
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3 */
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4 package name.blackcap.exifwasher.exiv2
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5
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6 import java.io.File
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7 import java.io.FileOutputStream
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8 import java.io.IOException
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9 import java.util.jar.JarEntry
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10 import java.util.jar.JarFile
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11 import java.util.logging.Level
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12 import java.util.logging.Logger
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13 import javax.swing.*
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14 import name.blackcap.exifwasher.Application
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15 import name.blackcap.exifwasher.LF_DIR
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16 import name.blackcap.exifwasher.LOGGER
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17 import name.blackcap.exifwasher.OS
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18
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19 object Initialize {
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20 private var initialized = false
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21
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22 public fun libraries() {
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23 /* no-op if already initialized */
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24 if (initialized) {
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25 return
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26 }
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27
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28 /* use the appropriate binary for the system we're on */
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29 val (subdir, pfx, ext) = when(OS.type) {
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30 OS.UNIX -> Triple("linux", "lib", ".so")
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31 OS.MAC -> Triple("mac", "lib", ".dylib")
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32 OS.WINDOWS -> Triple("windows", "", ".dll")
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33 OS.OTHER -> throw RuntimeException("unsupported OS!")
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34 }
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35
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36 /* extract to scratch files, if needed, then load */
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37 val klass = Initialize::class.java
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38 var myJar = JarFile(File(klass.getProtectionDomain().getCodeSource().getLocation().toURI()))
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39 for (base in arrayOf("exiv2", "jni")) {
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40 val eBase = "${pfx}${base}${ext}"
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41 val sPath = "name/blackcap/exifwasher/binaries/${subdir}/${eBase}"
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42 val source = myJar.getJarEntry(sPath)
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43 if (source == null) {
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44 die("${sPath} not found in jar")
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45 }
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46 val target = File(LF_DIR, eBase)
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47 val tPath = target.absolutePath
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48 try {
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49 if (!target.exists() || target.lastModified() < source.getTime()) {
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50 myJar.getInputStream(source).use { sfp ->
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51 FileOutputStream(target).use { tfp ->
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52 sfp.copyTo(tfp)
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53 }
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54 }
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55 target.setExecutable(true)
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56 target.setLastModified(source.getTime())
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57 }
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58 } catch (e: IOException) {
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59 LOGGER.log(Level.SEVERE, "unable to create ${tPath}", e)
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60 val message = e.message ?: "I/O error"
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61 die("unable to create ${tPath}: ${message}")
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62 }
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63 try {
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64 System.load(tPath)
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65 } catch (e: UnsatisfiedLinkError) {
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66 LOGGER.log(Level.SEVERE, "unable to link ${tPath}", e)
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67 val message = e.message ?: "unsatisfied link"
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68 die("unable to link ${tPath}: ${message}")
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69 }
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70 }
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71
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72 initialized = true
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73 }
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74
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75 private fun die(message: String) {
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76 JOptionPane.showMessageDialog(Application.mainFrame,
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77 "A fatal error occurred in initialization:\n${message}",
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78 "Error", JOptionPane.ERROR_MESSAGE)
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79 LOGGER.log(Level.SEVERE, "aborted due to fatal error")
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80 System.exit(1)
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81 }
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82 }