Add string attribute interfaces.
- Add interface definition to be used for UC1. (ONOS-1428, ONOS-1354, ONOS-1390)
- Added toString which was missing only on SwitchImpl.
Change-Id: I5a97d5132129213d78999e4f24917e5e5dbe4496
diff --git a/src/main/java/net/onrc/onos/core/topology/StringAttributes.java b/src/main/java/net/onrc/onos/core/topology/StringAttributes.java
new file mode 100644
index 0000000..89c5b5c
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/topology/StringAttributes.java
@@ -0,0 +1,32 @@
+package net.onrc.onos.core.topology;
+
+import java.util.Map;
+
+/**
+ * Interface for Elements with StringAttributes.
+ */
+public interface StringAttributes {
+ /**
+ * Gets the string attribute.
+ *
+ * @param attr attribute name
+ * @return attribute value or null
+ */
+ public String getStringAttribute(final String attr);
+
+ /**
+ * Gets the string attribute.
+ *
+ * @param attr attribute name
+ * @param def default value if {@code attr} did not exist
+ * @return attribute value or null
+ */
+ public String getStringAttribute(final String attr, final String def);
+
+ /**
+ * Gets all the string attributes.
+ *
+ * @return Immutable Map containing all the String attributes.
+ */
+ public Map<String, String> getAllStringAttributes();
+}