Cache parsed THEOplayer version

Author: MattiasBuelens

ui/src/main/java/com/theoplayer/android/ui/Helper.kt

@@ -70,4 +70,24 @@ fun rememberTrackLabel(
     resources: Resources = LocalResources.current,
 ): String = remember(key1 = track.id, key2 = track.uid) {
     constructLabel(track) ?: resources.getString(R.string.theoplayer_ui_track_unknown)
+}
+
+/**
+ * Memoize the most recent call.
+ */
+internal inline fun <P, R> memoizeLast(crossinline transform: (P) -> R): (P) -> R {
+    return object : (P) -> R {
+        private var lastCall: Pair<P, R>? = null
+
+        override fun invoke(input: P): R {
+            val lastCall = this.lastCall
+            return if (lastCall != null && lastCall.first == input) {
+                lastCall.second
+            } else {
+                transform(input).also { output ->
+                    this.lastCall = input to output
+                }
+            }
+        }
+    }
 }

ui/src/main/java/com/theoplayer/android/ui/util/TrackExts.kt

@@ -1,7 +1,6 @@
 package com.theoplayer.android.ui.util
 
 import androidx.annotation.CheckResult
-import com.theoplayer.android.api.THEOplayerGlobal
 import com.theoplayer.android.api.player.track.Track
 import com.theoplayer.android.api.player.track.texttrack.TextTrack
 import com.theoplayer.android.api.player.track.texttrack.TextTrackType
@@ -52,11 +51,9 @@ internal val Track.localizedLanguageName: String?
 internal fun constructLabel(
     track: Track,
 ): String? {
-    val playerVersion = Version.parse(THEOplayerGlobal.getVersion()) ?: Version.ZERO
-
     val label: String? = if (
         (track is TextTrack) &&
-        playerVersion.major < 11 &&
+        theoplayerVersion.major < 11 &&
         (isLabelCeaFormatted(track.label) || (track.label != null && track.language == track.label))
     ) {
         // If we are below 11th major release

ui/src/main/java/com/theoplayer/android/ui/util/VersionUtil.kt

@@ -1,5 +1,8 @@
 package com.theoplayer.android.ui.util
 
+import com.theoplayer.android.api.THEOplayerGlobal
+import com.theoplayer.android.ui.memoizeLast
+
 private const val VERSION_DELIMITER = '.'
 
 /**
@@ -42,3 +45,11 @@ internal data class Version(
         }
     }
 }
+
+private val getCachedTheoplayerVersion = memoizeLast(Version::parse)
+
+/**
+ * Returns the major version of THEOplayer.
+ */
+internal val theoplayerVersion: Version
+    get() = getCachedTheoplayerVersion(THEOplayerGlobal.getVersion()) ?: Version.ZERO