Github user kchilton2 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/237#discussion_r143287735
--- Diff:
common/rya.api/src/main/java/org/apache/rya/api/functions/OWLTime.java ---
@@ -0,0 +1,114 @@
+/*
+ * 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.api.functions;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.time.temporal.ChronoUnit;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import org.openrdf.model.URI;
+import org.openrdf.model.ValueFactory;
+import org.openrdf.model.impl.ValueFactoryImpl;
+
+/**
+ * Constants for OWL-Time primitives in the OWL-Time namespace.
+ *
+ */
+public class OWLTime {
+
+ private static final ValueFactory FACTORY =
ValueFactoryImpl.getInstance();
+
+ /**
+ * Indicates namespace of OWL-Time ontology
+ */
+ public static final String NAMESPACE = "http://www.w3.org/2006/time#";;
+ /**
+ * Seconds class of type DurationDescription in OWL-Time ontology
+ */
+ public static final URI SECONDS_URI = FACTORY.createURI(NAMESPACE,
"seconds");
+ /**
+ * Minutes class of type DurationDescription in OWL-Time ontology
+ */
+ public static final URI MINUTES_URI = FACTORY.createURI(NAMESPACE,
"minutes");
+ /**
+ * Hours class of type DurationDescription in OWL-Time ontology
+ */
+ public static final URI HOURS_URI = FACTORY.createURI(NAMESPACE,
"hours");
+ /**
+ * Days class of type DurationDescription in OWL-Time ontology
+ */
+ public static final URI DAYS_URI = FACTORY.createURI(NAMESPACE,
"days");
+ /**
+ * Weeks class of type DurationDescription in OWL-Time ontology
+ */
+ public static final URI WEEKS_URI = FACTORY.createURI(NAMESPACE,
"weeks");
+
+ private static final Map<URI, ChronoUnit> DURATION_MAP = new
HashMap<>();
+
+ static {
+ DURATION_MAP.put(SECONDS_URI, ChronoUnit.SECONDS);
+ DURATION_MAP.put(MINUTES_URI, ChronoUnit.MINUTES);
+ DURATION_MAP.put(HOURS_URI, ChronoUnit.HOURS);
+ DURATION_MAP.put(DAYS_URI, ChronoUnit.DAYS);
+ DURATION_MAP.put(WEEKS_URI, ChronoUnit.WEEKS);
+ }
+
+ /**
+ * Verifies whether URI is a valid OWL-Time URI that is supported by
this class.
+ * @param durationURI - OWLTime URI indicating the time unit
+ * @return - {@code true} if this URI indicates a supported OWLTime
time unit
+ */
+ public static boolean isValidDurationType(URI durationURI) {
+ checkNotNull(durationURI);
+ return DURATION_MAP.containsKey(durationURI);
+ }
+
+ /**
+ * Returns the duration in milliseconds
+ *
+ * @param duration - amount of time in the units indicated by the
provided {@link OWLTime} URI
+ * @param uri - OWLTime URI indicating the time unit of duration
+ * @return - the amount of time in milliseconds
+ * @throws IllegalArgumentException if provided {@link URI} is not a
valid, supported OWL-Time time unit.
+ */
+ public static long getMillis(int duration, URI uri) throws
IllegalArgumentException {
+ Optional<ChronoUnit> unit = getChronoUnitFromURI(uri);
+ checkArgument(unit.isPresent(),
+ String.format("URI %s does not indicate a valid OWLTime
time unit. URI must of be of type %s, %s, %s, %s, or %s .", uri,
+ SECONDS_URI, MINUTES_URI, HOURS_URI, DAYS_URI,
WEEKS_URI));
+ return duration * unit.get().getDuration().toMillis();
+ }
+
+ /**
+ * Converts the {@link OWLTime} URI time unit to a {@link ChronoUnit}
time unit
+ *
+ * @param durationURI - OWLTime time unit URI
+ * @return - corresponding ChronoUnit time unit
+ */
+ public static Optional<ChronoUnit> getChronoUnitFromURI(URI
durationURI) {
--- End diff --
This function could be simplified to:
```java
public static Optional<ChronoUnit> getChronoUnitFromURI(URI durationURI) {
return Optional.ofNullable(DURATION_MAP.get(durationURI));
}
```
---
