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https://issues.apache.org/jira/browse/RYA-392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198733#comment-16198733
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ASF GitHub Bot commented on RYA-392:
------------------------------------
Github user jdasch commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/237#discussion_r143742007
--- Diff:
common/rya.api/src/main/java/org/apache/rya/api/functions/OWLTime.java ---
@@ -0,0 +1,111 @@
+/*
+ * 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<>();
--- End diff --
Nit: Using an ImmutableMap would make your intent here clearer.
> Temporal Difference Function
> ----------------------------
>
> Key: RYA-392
> URL: https://issues.apache.org/jira/browse/RYA-392
> Project: Rya
> Issue Type: New Feature
> Affects Versions: 3.2.11
> Reporter: Caleb Meier
> Assignee: Caleb Meier
>
> Currently Rya does not provide a Function that determines whether two
> temporal literals are within a given period of time of one another. This is
> extremely useful for filtering on query results that occurred within a fixed
> period of time of a given instant. Currently, if one attempts to form the
> following filter Filter(?time1 - ?time2 < "24"^^xsd:hour), an exception will
> be thrown if ?time1 and ?time2 are date time literals. I propose
> implementing a Function that takes in two temporal literals, an integer and a
> time unit and determines whether the date times are within the prescribed
> period of one another.
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