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https://issues.apache.org/jira/browse/JENA-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16401765#comment-16401765
]
ASF GitHub Bot commented on JENA-632:
-------------------------------------
Github user kinow commented on a diff in the pull request:
https://github.com/apache/jena/pull/114#discussion_r175060320
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/engine/JsonIterator.java ---
@@ -0,0 +1,100 @@
+/*
+ * 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.jena.sparql.engine;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+import org.apache.jena.atlas.json.JsonObject;
+import org.apache.jena.atlas.json.JsonValue;
+import org.apache.jena.atlas.lib.Closeable;
+
+import org.apache.jena.graph.Node;
+import org.apache.jena.sparql.core.Var;
+import org.apache.jena.sparql.engine.binding.Binding;
+import org.apache.jena.sparql.lib.RDFTerm2Json;
+
+/** A JSON iterator for JsonObject's, that wraps a QueryIterator, and a
list
+ * of result variables.
+ */
+public class JsonIterator implements Iterator<JsonObject>
+{
+
+ private final QueryIterator queryIterator ;
+ private final List<String> resultVars ;
+
+ public JsonIterator(QueryIterator queryIterator, List<String>
resultVars)
+ {
+ this.queryIterator = queryIterator ;
+ this.resultVars = Collections.unmodifiableList(resultVars) ;
+ }
+
+ @Override
+ public boolean hasNext()
+ {
+ if (queryIterator == null)
+ return false;
+ boolean r = queryIterator.hasNext() ;
+ if (!r)
+ close() ;
+ return r ;
+ }
+
+ @Override
+ public JsonObject next()
+ {
+ if (queryIterator == null)
+ throw new NoSuchElementException(this.getClass() + ".next") ;
+ try
+ {
+ Binding binding = queryIterator.next() ;
+ JsonObject jsonObject = new JsonObject() ;
+ for (String resultVar : resultVars)
+ {
+ Node n = binding.get(Var.alloc(resultVar)) ;
+ JsonValue value = RDFTerm2Json.fromNode(n) ;
--- End diff --
@afs updated the code where I mentioned before...
> Generate JSON from SPARQL directly.
> -----------------------------------
>
> Key: JENA-632
> URL: https://issues.apache.org/jira/browse/JENA-632
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ, Fuseki
> Reporter: Andy Seaborne
> Assignee: Bruno P. Kinoshita
> Priority: Minor
> Labels: java, javacc
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The capability to generate JSON directly from a SPARQL (or extended SPARQL)
> query would enable the creation of JSON data API over published linked data.
> This project would cover:
> # Design and publication of a design.
> # Refinement of design based on community feed
> # Implementation, including testing.
> # Refinement of implementation based on community feed
> Skills required: Java, some parser work, design and discussion with the user
> community, basic understanding of HTTP and content negotiation.
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