Wip

pgp-certificates/src/main/java/pgp/CertificateMerger.java

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+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp;
+
+import java.io.IOException;
+
+/**
+ * Merge a given certificate (update) with an existing certificate.
+ */
+public interface CertificateMerger {
+
+    /**
+     * Merge the given certificate data with the existing certificate and return the result.
+     *
+     * If no existing certificate is found (i.e. existing is null), this method returns the unmodified data.
+     *
+     * @param data certificate
+     * @param existing optional already existing copy of the certificate
+     * @return merged certificate
+     */
+    Certificate merge(Certificate data, Certificate existing) throws IOException;
+
+}