Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/275#discussion_r171402268
--- Diff:
common/rya.api/src/main/java/org/apache/rya/api/utils/QueryInvestigator.java ---
@@ -0,0 +1,104 @@
+/**
+ * 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.utils;
+
+import static java.util.Objects.requireNonNull;
+
+import java.util.regex.Pattern;
+
+import org.openrdf.query.MalformedQueryException;
+import org.openrdf.query.parser.sparql.SPARQLParser;
+
+import edu.umd.cs.findbugs.annotations.DefaultAnnotation;
+import edu.umd.cs.findbugs.annotations.NonNull;
+
+/**
+ * A utility class that is used to glean insight into the structure of
SPARQL queries.
+ */
+@DefaultAnnotation(NonNull.class)
+public class QueryInvestigator {
+
+ private static final SPARQLParser PARSER = new SPARQLParser();
+
+ private QueryInvestigator() { }
+
+ /**
+ * Determines whether a SPARQL command is a CONSTRUCT or not.
+ *
+ * @param sparql - The SPARQL to evaluate. (not null)
+ * @return {@code true} if the provided SPARQL is a CONSTRUCT query;
otherwise {@code false}.
+ * @throws MalformedQueryException The SPARQL is neither a well formed
query or update.
+ */
+ public static boolean isConstruct(final String sparql) throws
MalformedQueryException {
+ requireNonNull(sparql);
+
+ try {
+ // Constructs are queries, so try to create a ParsedQuery.
+ PARSER.parseQuery(sparql, null);
+
+ // Check to see if the SPARQL looks like a CONSTRUCT query.
+ return Pattern.matches(".*?construct.*?where.*",
sparql.toLowerCase());
--- End diff --
SELECT is supposed to create a ParsedTupleQuery based on looking at the
[SPARQLParser.parseQuery()](https://github.com/ansell/openrdf-sesame/blob/fdf723d99ccdbdf0104e92c6a6433a8fbfe59750/core/queryparser/sparql/src/main/java/org/openrdf/query/parser/sparql/SPARQLParser.java)
code but there's no documentation for any special cases. But it does look
like DESCRIBE queries also use ParsedGraphQuery. Maybe also including a check
similar to the INSERT example below would be best.
---
