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pgpainless-wot/src/main/java/org/pgpainless/wot/WebOfTrust.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot;
 
 import org.bouncycastle.openpgp.PGPPublicKeyRing;

pgpainless-wot/src/main/java/org/pgpainless/wot/WebOfTrustCertificateStore.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot;
 
 import pgp.cert_d.PGPCertificateDirectory;

pgpainless-wot/src/main/java/org/pgpainless/wot/package-info.java

@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * PGPainless API for Web of Trust.
+ */
+package org.pgpainless.wot;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Cost.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 public class Cost {

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Dijkstra.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import javax.annotation.Nullable;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Edge.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 public abstract class Edge<T, C extends Cost> implements Comparable<C> {

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Graph.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import java.util.Collection;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/IntegerUtils.java

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.wot.dijkstra;
+
+public final class IntegerUtils {
+
+    private IntegerUtils() {
+
+    }
+
+    /**
+     * Backported method from Java 8.
+     *
+     * @param x x
+     * @param y y
+     * @return result of comparison
+     */
+    public static int compare(int x, int y) {
+        // noinspection UseCompareMethod
+        return x < y ? -1 : (x == y ? 0 : 1);
+    }
+}

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Node.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 public class Node<T> {

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/Path.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import java.util.Arrays;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/ShortestPathDijkstra.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import javax.annotation.Nullable;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/SimpleEdge.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 public class SimpleEdge<T> extends Edge<T, Cost.SimpleCost> {

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/TrustEdge.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import javax.annotation.Nonnull;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/WotDijkstra.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import javax.annotation.Nullable;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/package-info.java

@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * Dijkstra-based WoT implementation using a flow network.
+ */
+package org.pgpainless.wot.dijkstra;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/CertSynopsis.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import org.pgpainless.algorithm.RevocationState;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Certification.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.Date;
@@ -110,7 +114,7 @@ public class Certification {
     }
 
     /**
-     * Get the creation time of the certification,
+     * Get the creation time of the certification.
      *
      * @return creation time
      */

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/CertificationSet.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.ArrayList;
@@ -9,7 +13,7 @@ import org.bouncycastle.openpgp.PGPSignature;
 
 import javax.annotation.Nonnull;
 
-public class CertificationSet {
+public final class CertificationSet {
 
     private final CertSynopsis issuer;
     private final CertSynopsis target;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Depth.java

@@ -1,8 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
+import org.pgpainless.wot.dijkstra.IntegerUtils;
+
 import javax.annotation.Nonnull;
 
-public class Depth implements Comparable<Depth> {
+public final class Depth implements Comparable<Depth> {
 
     private final Optional<Integer> depth;
 
@@ -55,7 +61,7 @@ public class Depth implements Comparable<Depth> {
             if (o.isUnconstrained()) {
                 return -1;
             } else {
-                return Integer.compare(getLimit().get(), o.getLimit().get());
+                return IntegerUtils.compare(getLimit().get(), o.getLimit().get());
             }
         }
     }

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Network.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.ArrayList;
@@ -12,7 +16,6 @@ import org.bouncycastle.openpgp.PGPPublicKeyRing;
 import org.bouncycastle.openpgp.PGPSignature;
 import org.pgpainless.algorithm.KeyFlag;
 import org.pgpainless.algorithm.RevocationState;
-import org.pgpainless.algorithm.RevocationStateType;
 import org.pgpainless.key.OpenPgpFingerprint;
 import org.pgpainless.key.info.KeyRingInfo;
 import org.pgpainless.key.util.RevocationAttributes;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Optional.java

@@ -1,9 +1,13 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-public class Optional<T> {
+public final class Optional<T> {
 
     private final T item;
 

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Path.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.ArrayList;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/Paths.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.ArrayList;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/ReferenceTime.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import javax.annotation.Nonnull;

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/RegexSet.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.util.Collections;
@@ -10,7 +14,7 @@ import javax.annotation.Nonnull;
 
 import org.bouncycastle.bcpg.sig.RegularExpression;
 
-public class RegexSet {
+public final class RegexSet {
 
     private final Set<String> regexStrings;
 

wot-dijkstra/src/main/java/org/pgpainless/wot/dijkstra/sq/package-info.java

@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * Web of Trust implementation.
+ */
+package org.pgpainless.wot.dijkstra.sq;

wot-dijkstra/src/test/java/org/pgpainless/wot/dijkstra/BasicShortestPathDijkstraTest.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;

wot-dijkstra/src/test/java/org/pgpainless/wot/dijkstra/NodeTest.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra;
 
 import org.junit.jupiter.api.Test;

wot-dijkstra/src/test/java/org/pgpainless/wot/dijkstra/sq/DepthTest.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import org.junit.jupiter.api.Test;

wot-dijkstra/src/test/java/org/pgpainless/wot/dijkstra/sq/NetworkTest.java

@@ -1,17 +1,13 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.bouncycastle.openpgp.PGPException;
-import org.bouncycastle.openpgp.PGPPublicKey;
-import org.bouncycastle.openpgp.PGPPublicKeyRing;
-import org.bouncycastle.openpgp.PGPSecretKeyRing;
 import org.junit.jupiter.api.Test;
-import org.pgpainless.PGPainless;
-
-import java.security.InvalidAlgorithmParameterException;
-import java.security.NoSuchAlgorithmException;
 
 public class NetworkTest {
 
@@ -29,6 +25,7 @@ public class NetworkTest {
     @Test
     public void testNetworkFromCertificates() {
         ReferenceTime referenceTime = ReferenceTime.now();
+        // TODO: Implement
     }
 
 

wot-dijkstra/src/test/java/org/pgpainless/wot/dijkstra/sq/WotTestVectors.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.wot.dijkstra.sq;
 
 import java.io.IOException;
@@ -249,6 +253,7 @@ public class WotTestVectors {
                 })
                 .getCertifiedCertificate();
 
+        // CHECKSTYLE:OFF
         System.out.println("Foo Employee");
         System.out.println(PGPainless.asciiArmor(caCertifiedFooBankEmployeeCert));
 
@@ -263,6 +268,7 @@ public class WotTestVectors {
 
         System.out.println("Bar Employee");
         System.out.println(PGPainless.asciiArmor(barCaCertifiedEmployeeCert));
+        // CHECKSTYLE:ON
     }
 
     private static InputStream getTestResourceInputStream(String resource) {