add UUID -> ToBase64String() -> String

virtdata-lib-basics/src/main/java/io/nosqlbench/virtdata/library/basics/shared/from_uuid/ToBase64String.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2022 nosqlbench
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.nosqlbench.virtdata.library.basics.shared.from_uuid;
+
+import io.nosqlbench.virtdata.api.annotations.Example;
+import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.UUID;
+import java.util.function.Function;
+
+@ThreadSafeMapper
+public class ToBase64String implements Function<UUID,String> {
+    private ThreadLocal<Base64.Encoder> tl_encoder = ThreadLocal.withInitial(Base64::getEncoder);
+
+    @Example({"ToBase64String()","Encode the bits of a UUID into a Base64 String"})
+    public ToBase64String() {
+    }
+
+    @Override
+    public String apply(UUID uuid) {
+        ByteBuffer bytes = ByteBuffer.allocate(Long.BYTES << 1);
+        bytes.putLong(uuid.getMostSignificantBits());
+        bytes.putLong(uuid.getLeastSignificantBits());
+        Base64.Encoder encoder = tl_encoder.get();
+        byte[] encoded = encoder.encode(bytes.array());
+        return new String(encoded, StandardCharsets.UTF_8);
+    }
+}

virtdata-lib-basics/src/test/java/io/nosqlbench/virtdata/library/basics/shared/from_long/to_string/ToBase64StringTest.java

@@ -16,15 +16,19 @@
 
 package io.nosqlbench.virtdata.library.basics.shared.from_long.to_string;
 
+import io.nosqlbench.virtdata.library.basics.shared.from_long.to_uuid.ToUUID;
+import io.nosqlbench.virtdata.library.basics.shared.from_uuid.ToBase64String;
 import org.junit.jupiter.api.Test;
 
+import java.util.UUID;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class ToBase64StringTest {
 
     @Test
     public void testApply() {
-        ToBase64String f = new ToBase64String();
+        io.nosqlbench.virtdata.library.basics.shared.from_long.to_string.ToBase64String f = new io.nosqlbench.virtdata.library.basics.shared.from_long.to_string.ToBase64String();
         String apply = f.apply(32144123454345L);
         assertThat(apply).isEqualTo("AAAdPCMPY4k=");
     }
@@ -35,7 +39,15 @@ public class ToBase64StringTest {
                 new io.nosqlbench.virtdata.library.basics.shared.unary_string.ToBase64String();
         String r = f.apply("four score and seven years ago");
         assertThat(r).isEqualTo("Zm91ciBzY29yZSBhbmQgc2V2ZW4geWVhcnMgYWdv");
+    }
 
+    @Test
+    public void testUuidToBase64() {
+        ToUUID toUUID = new ToUUID();
+        UUID uuid1 = toUUID.apply(1);
+        ToBase64String toBase64 = new ToBase64String();
+        String string = toBase64.apply(uuid1);
+        assertThat(string).isEqualTo("ASNFZ4mrTe+AAAAAAAAAAQ==");
     }
 
 }