1 files changed, 52 insertions, 0 deletions
diff --git a/core/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/slitopologyutils/graph/DefaultEdgeWeigher.java b/core/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/slitopologyutils/graph/DefaultEdgeWeigher.java
new file mode 100644
index 000000000..92a9172b2
--- /dev/null
+++ b/core/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/slitopologyutils/graph/DefaultEdgeWeigher.java
@@ -0,0 +1,52 @@
+package org.onap.ccsdk.sli.core.slipluginutils.slitopologyutils.graph;
+
+/**
+ * Default weigher returns identical weight for every graph edge. Basically it
+ * is a hop count weigher.
+ * Produces weights of {@link ScalarWeight} type.
+ *
+ * @param <V> vertex type
+ * @param <E> edge type
+ */
+public class DefaultEdgeWeigher<V extends Vertex, E extends Edge<V>>
+        implements EdgeWeigher<V, E> {
+
+    /**
+     * Common weight value for any link.
+     */
+    protected static final double HOP_WEIGHT_VALUE = 1;
+    /**
+     * Weight value for null path (without links).
+     */
+    protected static final double NULL_WEIGHT_VALUE = 0;
+
+    /**
+     * Default weight based on hop count.
+     * {@value #HOP_WEIGHT_VALUE}
+     */
+    public static final ScalarWeight DEFAULT_HOP_WEIGHT =
+            new ScalarWeight(HOP_WEIGHT_VALUE);
+
+    /**
+     * Default initial weight.
+     * {@value #NULL_WEIGHT_VALUE}
+     */
+    public static final ScalarWeight DEFAULT_INITIAL_WEIGHT =
+            new ScalarWeight(NULL_WEIGHT_VALUE);
+
+    @Override
+    public Weight weight(E edge) {
+        return DEFAULT_HOP_WEIGHT;
+    }
+
+    @Override
+    public Weight getInitialWeight() {
+        return DEFAULT_INITIAL_WEIGHT;
+    }
+
+    @Override
+    public Weight getNonViableWeight() {
+        return ScalarWeight.NON_VIABLE_WEIGHT;
+    }
+}
+