1 files changed, 54 insertions, 0 deletions
diff --git a/config-provisioning/src/main/java/com/yahoo/config/provision/InstanceName.java b/config-provisioning/src/main/java/com/yahoo/config/provision/InstanceName.java
new file mode 100644
index 00000000000..d8696098b4b
--- /dev/null
+++ b/config-provisioning/src/main/java/com/yahoo/config/provision/InstanceName.java
@@ -0,0 +1,54 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.config.provision;
+
+import java.util.Objects;
+
+/**
+ * Represents an applications instance name, which may be any kind of string or default. This type is defined
+ * in order to provide a type safe API for defining environments.
+ *
+ * @author lulf
+ * @since 5.25
+ */
+public class InstanceName implements Comparable<InstanceName> {
+    private final String instanceName;
+
+    private InstanceName(String instanceName) {
+        this.instanceName = instanceName;
+    }
+
+    @Override
+    public int hashCode() {
+        return instanceName.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof InstanceName)) return false;
+        return Objects.equals(((InstanceName) obj).instanceName, instanceName);
+    }
+
+    @Override
+    public String toString() {
+        return instanceName;
+    }
+
+    public static InstanceName from(String name) {
+        return new InstanceName(name);
+    }
+
+    public static InstanceName defaultName() {
+        return new InstanceName("default");
+    }
+
+    public boolean isDefault() {
+        return equals(InstanceName.defaultName());
+    }
+
+    public String value() { return instanceName; }
+
+    @Override
+    public int compareTo(InstanceName instance) {
+        return instanceName.compareTo(instance.instanceName);
+    }
+}