Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/233#discussion_r110013073
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/core/mosaic/Topology.java ---
@@ -0,0 +1,45 @@
+package org.apache.jena.sparql.core.mosaic;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.jena.sparql.core.DatasetGraph;
+import org.apache.jena.sparql.core.mem.DatasetGraphInMemory;
+import org.apache.jena.sparql.util.Symbol;
+
+public class Topology {
+
+ protected static final Map<Symbol, Metric> ENTRIES;
+
+ public static Symbol keyFor(final Class<? extends DatasetGraph> c) {
+ return Symbol.create(c.getName());
+ }
+
+ static {
+ final Map<Symbol, Metric> entries = new HashMap<>();
+
+ entries.put(keyFor(DatasetGraph.class), new Metric());
+
+ entries.put(keyFor(DatasetGraphInMemory.class), new Metric());
--- End diff --
Just a style thing, but
`org.apache.jena.ext.com.google.common.collect.ImmutableMap.of(K, V, K, V)`
would let you build this right in the field declaration, no `static` stanza
needed.
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