Add tests for SharedPGPCertificateDirectoryAdapter

pgp-certificate-store/src/main/java/pgp/certificate_store/SubkeyLookup.java

@@ -0,0 +1,25 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.certificate_store;
+
+public interface SubkeyLookup {
+
+    /**
+     * Lookup the identifier of the certificate that contains the given subkey.
+     * If no record is found, return null.
+     *
+     * @param subkeyId subkey id
+     * @return identifier (fingerprint or special name) of the certificate
+     */
+    String getIdentifierForSubkeyId(long subkeyId);
+
+    /**
+     * Store a record of the subkey id that points to the identifier.
+     *
+     * @param subkeyId subkey id
+     * @param identifier fingerprint or special name of the certificate
+     */
+    void storeIdentifierForSubkeyId(long subkeyId, String identifier);
+}