Slice out LinkKey
Change-Id: Ibfcafd07858c5357a2321220e01ddab44f347923
diff --git a/core/api/src/main/java/org/onlab/onos/net/LinkKey.java b/core/api/src/main/java/org/onlab/onos/net/LinkKey.java
new file mode 100644
index 0000000..dee4e88
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/LinkKey.java
@@ -0,0 +1,71 @@
+package org.onlab.onos.net;
+
+import java.util.Objects;
+
+import com.google.common.base.MoreObjects;
+
+// TODO Consider renaming.
+// it's an identifier for a Link, but it's not ElementId, so not using LinkId.
+/**
+ * Immutable representation of a link identity.
+ */
+public class LinkKey {
+
+ private final ConnectPoint src;
+ private final ConnectPoint dst;
+
+ /**
+ * Returns source connection point.
+ *
+ * @return source connection point
+ */
+ public ConnectPoint src() {
+ return src;
+ }
+
+ /**
+ * Returns destination connection point.
+ *
+ * @return destination connection point
+ */
+ public ConnectPoint dst() {
+ return dst;
+ }
+
+ /**
+ * Creates a link identifier with source and destination connection point.
+ *
+ * @param src source connection point
+ * @param dst destination connection point
+ */
+ public LinkKey(ConnectPoint src, ConnectPoint dst) {
+ this.src = src;
+ this.dst = dst;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(src(), dst);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj instanceof LinkKey) {
+ final LinkKey other = (LinkKey) obj;
+ return Objects.equals(this.src(), other.src()) &&
+ Objects.equals(this.dst, other.dst);
+ }
+ return false;
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("src", src())
+ .add("dst", dst)
+ .toString();
+ }
+}