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https://issues.apache.org/jira/browse/JENA-1559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508013#comment-16508013
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ASF GitHub Bot commented on JENA-1559:
--------------------------------------
Github user afs commented on a diff in the pull request:
https://github.com/apache/jena/pull/431#discussion_r194398068
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/graph/PrefixMappingOver.java ---
@@ -0,0 +1,97 @@
+/*
+ * 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.graph;
+
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+import org.apache.jena.iri.IRI;
+import org.apache.jena.riot.system.PrefixMap;
+
+public class PrefixMappingOver extends PrefixMappingBase {
--- End diff --
Its real name is `PrefixMappingOverPrefixMap` ... seemed a bit long and
confusing.
It does not seem to be a decorator. Would "Adapter" be OK?
> Avoid unnecessary prefix loading in GraphPrefixesProjection
> ------------------------------------------------------------
>
> Key: JENA-1559
> URL: https://issues.apache.org/jira/browse/JENA-1559
> Project: Apache Jena
> Issue Type: Task
> Affects Versions: Jena 3.7.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Major
>
> {{GraphPrefixesProjection}} loads all prefixes from the database (JENA-81).
> It was done that way because {{PrefixMappingImpl}} has internal
> datastructures that are not passing through lookup misses.
> Load as needed and rework the way the prefix implementation to cleanly
> separate algorithms from storage.
> Leave {{PrefixMappingImpl}} untouched - its name and details are too
> well-known.
>
>
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