1 files changed, 52 insertions, 0 deletions
diff --git a/container-core/src/main/java/com/yahoo/component/chain/Phase.java b/container-core/src/main/java/com/yahoo/component/chain/Phase.java
new file mode 100644
index 00000000000..64584450c23
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/component/chain/Phase.java
@@ -0,0 +1,52 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.component.chain;
+
+import com.yahoo.component.chain.dependencies.Dependencies;
+
+import java.util.Set;
+import java.util.TreeSet;
+
+/**
+ * Used for many to many constraints on searcher ordering. Immutable.
+ *
+ * @author Tony Vaagenes
+ */
+public class Phase {
+
+    public final Dependencies dependencies;
+
+    public Phase(String name, Set<String> before, Set<String> after) {
+        dependencies = new Dependencies(provides(name), before, after);
+    }
+
+    public Phase(String name, Dependencies dependencies) {
+        this(name, dependencies.before(), dependencies.after());
+        assert(dependencies.provides().isEmpty());
+    }
+
+    private Set<String> provides(String name) {
+        Set<String> provides = new TreeSet<>();
+        provides.add(name);
+        return provides;
+    }
+
+    public String getName() {
+        return dependencies.provides().iterator().next();
+    }
+
+    public Set<String> before() {
+        return dependencies.before();
+    }
+
+    public Set<String> after() {
+        return dependencies.after();
+    }
+
+    public Phase union(Phase phase) {
+        assert(getName().equals(phase.getName()));
+
+        Dependencies union = dependencies.union(phase.dependencies);
+        return new Phase(getName(), union.before(), union.after());
+    }
+
+}