Reintroduce pgp-certificate-store layer

pgp-cert-d-java/src/main/java/pgp/cert_d/PGPCertificateStoreAdapter.java

@@ -0,0 +1,77 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.cert_d;
+
+import pgp.certificate_store.PGPCertificateStore;
+import pgp.certificate_store.certificate.Certificate;
+import pgp.certificate_store.certificate.KeyMaterialMerger;
+import pgp.certificate_store.exception.BadDataException;
+import pgp.certificate_store.exception.BadNameException;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * Adapter class to adapt a {@link PGPCertificateDirectory} to the {@link  PGPCertificateStore} interface.
+ */
+public class PGPCertificateStoreAdapter implements PGPCertificateStore {
+
+    private final PGPCertificateDirectory directory;
+
+    public PGPCertificateStoreAdapter(PGPCertificateDirectory directory) {
+        this.directory = directory;
+    }
+
+    @Override
+    public Certificate getCertificate(String identifier)
+            throws IOException, BadNameException, BadDataException {
+        if (SpecialNames.lookupSpecialName(identifier) != null) {
+            return directory.getBySpecialName(identifier);
+        } else {
+            return directory.getByFingerprint(identifier.toLowerCase());
+        }
+    }
+
+    @Override
+    public Iterator<Certificate> getCertificatesBySubkeyId(long subkeyId)
+            throws IOException, BadDataException {
+        Set<String> fingerprints = directory.getCertificateFingerprintsForSubkeyId(subkeyId);
+        Set<Certificate> certificates = new HashSet<>();
+        for (String fingerprint : fingerprints) {
+            try {
+                certificates.add(directory.getByFingerprint(fingerprint));
+            } catch (BadNameException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return certificates.iterator();
+    }
+
+    @Override
+    public Certificate insertCertificate(InputStream data, KeyMaterialMerger merge)
+            throws IOException, InterruptedException, BadDataException {
+        Certificate certificate = directory.insert(data, merge);
+        return certificate;
+    }
+
+    @Override
+    public Certificate insertCertificateBySpecialName(String specialName, InputStream data, KeyMaterialMerger merge)
+            throws IOException, InterruptedException, BadDataException, BadNameException {
+        return directory.insertWithSpecialName(specialName, data, merge);
+    }
+
+    @Override
+    public Iterator<Certificate> getCertificates() {
+        return directory.items();
+    }
+
+    @Override
+    public Iterator<String> getFingerprints() {
+        return directory.fingerprints();
+    }
+}