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Posted to commits@jena.apache.org by an...@apache.org on 2014/12/28 20:05:41 UTC
[2/4] jena git commit: JENA-803 : Bare framework for custom aggregates
JENA-803 : Bare framework for custom aggregates
Project: http://git-wip-us.apache.org/repos/asf/jena/repo
Commit: http://git-wip-us.apache.org/repos/asf/jena/commit/addc1987
Tree: http://git-wip-us.apache.org/repos/asf/jena/tree/addc1987
Diff: http://git-wip-us.apache.org/repos/asf/jena/diff/addc1987
Branch: refs/heads/master
Commit: addc1987ee41505053686eb76c62e9045806fa5e
Parents: a1ee6e1
Author: Andy Seaborne <an...@apache.org>
Authored: Sun Dec 28 18:38:28 2014 +0000
Committer: Andy Seaborne <an...@apache.org>
Committed: Sun Dec 28 18:38:28 2014 +0000
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.../expr/aggregate/AccumulatorFactory.java | 31 +++++++++
.../expr/aggregate/AggregateRegistry.java | 70 ++++++++++++++++++++
2 files changed, 101 insertions(+)
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http://git-wip-us.apache.org/repos/asf/jena/blob/addc1987/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AccumulatorFactory.java
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diff --git a/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AccumulatorFactory.java b/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AccumulatorFactory.java
new file mode 100644
index 0000000..e5ba9cc
--- /dev/null
+++ b/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AccumulatorFactory.java
@@ -0,0 +1,31 @@
+/**
+ * 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 com.hp.hpl.jena.sparql.expr.aggregate;
+
+/** Fatory to create accumulators. An Accumulator is
+ * processor for one group key for one execution.
+ */
+public interface AccumulatorFactory {
+ /**
+ *
+ * @return Accumulator
+ */
+ public Accumulator createAccumulator(AggCustom agg) ;
+}
+
http://git-wip-us.apache.org/repos/asf/jena/blob/addc1987/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AggregateRegistry.java
----------------------------------------------------------------------
diff --git a/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AggregateRegistry.java b/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AggregateRegistry.java
new file mode 100644
index 0000000..b47ff81
--- /dev/null
+++ b/jena-arq/src/main/java/com/hp/hpl/jena/sparql/expr/aggregate/AggregateRegistry.java
@@ -0,0 +1,70 @@
+/**
+ * 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 com.hp.hpl.jena.sparql.expr.aggregate;
+
+import java.util.HashMap ;
+import java.util.Map ;
+
+import com.hp.hpl.jena.graph.Node ;
+
+/** Registry of custom aggregates
+ * There is only a single global registry of aggregates - it affects parsing
+ * and parsing happens before Context or Execution makes sense.
+ */
+public class AggregateRegistry {
+
+ private static Map<String, AccumulatorFactory> registry = new HashMap<>() ;
+ private static Map<String, Node> noGroupValues = new HashMap<>() ;
+
+ /**
+ * Register a custom aggregate, with its associated factory for accumulators.
+ */
+ public static void register(String uri, AccumulatorFactory accFactory) {
+ register(uri, accFactory, null) ;
+ }
+
+ public static void register(String uri, AccumulatorFactory accFactory, Node noGroupValue) {
+ registry.put(uri, accFactory) ;
+ noGroupValues.put(uri, noGroupValue) ;
+ }
+
+ /**
+ * Remove a registration.
+ */
+ public static void unregister(String uri) {
+ registry.remove(uri) ;
+ noGroupValues.remove(uri) ;
+ }
+
+ /** Return the AccumulatorFactory for a registered custom aggregate. */
+ public static AccumulatorFactory getAccumulatorFactory(String uri) {
+ return registry.get(uri) ;
+ }
+
+ /** Return the AccumulatorFactory for a registered custom aggregate. */
+ public static Node getNoGroupValue(String uri) {
+ return noGroupValues.get(uri) ;
+ }
+
+ /** Return the AccumulatorFactory for a registered custom aggregate. */
+ public static boolean isRegistered(String uri) {
+ return registry.containsKey(uri) ;
+ }
+}
+