preparing sqlite-based services

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.datastore.file/src/main/java/de/srsoftware/oidc/datastore/file/FileStoreProvider.java

@@ -0,0 +1,28 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.oidc.datastore.file;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.HashMap;
+
+
+public class FileStoreProvider extends HashMap<File, FileStore> {
+	private UuidHasher hasher;
+
+	public FileStoreProvider(UuidHasher passwordHasher) {
+		hasher = passwordHasher;
+	}
+
+
+	@Override
+	public FileStore get(Object o) {
+		if (o instanceof File storageFile) try {
+				var fileStore = super.get(storageFile);
+				if (fileStore == null) put(storageFile, fileStore = new FileStore(storageFile, hasher));
+				return fileStore;
+			} catch (IOException ioex) {
+				throw new RuntimeException(ioex);
+			}
+		return null;
+	}
+}