Github user meiercaleb commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/251#discussion_r153629832
--- Diff:
extras/rya.pcj.fluo/pcj.fluo.app/src/main/java/org/apache/rya/indexing/pcj/fluo/app/util/TriplePrefixUtils.java
---
@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.rya.indexing.pcj.fluo.app.util;
+
+import static
org.apache.rya.indexing.pcj.fluo.app.IncrementalUpdateConstants.NODEID_BS_DELIM;
+
+import org.apache.fluo.api.data.Bytes;
+import org.apache.fluo.api.data.Bytes.BytesBuilder;
+import org.apache.rya.api.domain.RyaStatement;
+
+/**
+ * This class is a utility class for adding and removing the Triple prefix
to
+ * Statements ingested into the Rya Fluo application. The Triple prefix
is added
+ * to supported range based compactions for removing transient data from
the Fluo
+ * application. This prefix supports the Transient data recipe described
on the
+ * the Fluo website, and reduces the computational load on the system by
cleaning up
+ * old deleted Triples and notifications using a targeted range compaction.
+ *
+ */
+public class TriplePrefixUtils {
+
+ private static final Bytes TRIPLE_PREFIX_BYTES = Bytes.of("T" +
NODEID_BS_DELIM);
+
+ /**
+ * Adds the prefix {@link TriplePrefixUtils#TRIPLE_PREFIX_BYTES} and
converts to {@link Bytes}.
+ * @param tripleBytes - serialized {@link RyaStatement}
+ * @return - serialized RyaStatement with prepended triple prefix,
converted to Bytes
+ */
+ public static Bytes addTriplePrefixAndConvertToBytes(byte[]
tripleBytes) {
+ BytesBuilder builder = Bytes.builder();
+ return
builder.append(TRIPLE_PREFIX_BYTES).append(tripleBytes).toBytes();
+ }
+
+ /**
+ * Removes the prefix {@link TriplePrefixUtils#TRIPLE_PREFIX_BYTES}
and converts to a byte array.
--- End diff --
Done.
---
