1 files changed, 26 insertions, 0 deletions
diff --git a/plugins/base/src/main/kotlin/resolvers/external/ExternalLocationProviderFactory.kt b/plugins/base/src/main/kotlin/resolvers/external/ExternalLocationProviderFactory.kt
new file mode 100644
index 00000000..83de9911
--- /dev/null
+++ b/plugins/base/src/main/kotlin/resolvers/external/ExternalLocationProviderFactory.kt
@@ -0,0 +1,26 @@
+package org.jetbrains.dokka.base.resolvers.external
+
+import org.jetbrains.dokka.links.DRI
+import java.util.concurrent.ConcurrentHashMap
+
+
+interface ExternalLocationProvider {
+
+    val param: String
+    fun DRI.toLocation(): String
+}
+
+interface ExternalLocationProviderFactory {
+
+    fun getExternalLocationProvider(param: String): ExternalLocationProvider?
+}
+
+class ExternalLocationProviderFactoryWithCache(val ext: ExternalLocationProviderFactory) : ExternalLocationProviderFactory {
+
+    private val locationProviders = ConcurrentHashMap<String, CacheWrapper>()
+
+    override fun getExternalLocationProvider(param: String): ExternalLocationProvider? =
+        locationProviders.getOrPut(param) { CacheWrapper(ext.getExternalLocationProvider(param)) }.provider
+}
+
+private class CacheWrapper(val provider: ExternalLocationProvider?)
+\ No newline at end of file