[
https://issues.apache.org/jira/browse/RYA-466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374856#comment-16374856
]
ASF GitHub Bot commented on RYA-466:
------------------------------------
Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/275#discussion_r170322179
--- 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 --
I don't think this will work in all cases. It looks like the following
query would incorrectly be considered a CONSTRUCT query:
```
SELECT ?constructionCompany
WHERE {
?constructionCompany <urn:built> <urn:skyscraper> .
}
```
Instead, try checking if the result of `PARSER.parseQuery()` is a
`ParsedGraphQuery`:
```
final ParsedQuery parsedQuery = PARSER.parseQuery(sparql, null);
return parsedQuery instanceof ParsedGraphQuery;
```
> Rya Streams Client - Stream results to file.
> --------------------------------------------
>
> Key: RYA-466
> URL: https://issues.apache.org/jira/browse/RYA-466
> Project: Rya
> Issue Type: Improvement
> Reporter: Kevin Chilton
> Assignee: Kevin Chilton
> Priority: Major
>
> The Rya Streams Client's stream results command needs to be updated to allow
> a user to stream Statement results to an NTriples file and Binding Sets to
> the standard JSON representation.
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