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1 files changed, 59 insertions, 0 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/resolvers/ResolverRegistry.java b/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/resolvers/ResolverRegistry.java
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+++ b/container-search/src/main/java/com/yahoo/search/pagetemplates/engine/resolvers/ResolverRegistry.java
@@ -0,0 +1,59 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.pagetemplates.engine.resolvers;
+
+import com.google.inject.Inject;
+import com.yahoo.component.AbstractComponent;
+import com.yahoo.component.ComponentId;
+import com.yahoo.component.provider.ComponentRegistry;
+import com.yahoo.search.pagetemplates.engine.Resolver;
+
+import java.util.List;
+import java.util.logging.Logger;
+
+/**
+ * A registry of available resolver components
+ *
+ * @author bratseth
+ */
+public class ResolverRegistry extends ComponentRegistry<Resolver> {
+
+    private final Resolver defaultResolver;
+
+    public ResolverRegistry(List<Resolver> resolvers) {
+        addBuiltInResolvers();
+        for (Resolver component : resolvers)
+            registerResolver(component);
+        defaultResolver = decideDefaultResolver();
+        freeze();
+    }
+
+    private void addBuiltInResolvers() {
+        registerResolver(createNativeDeterministicResolver());
+        registerResolver(createNativeRandomResolver());
+    }
+
+    private Resolver decideDefaultResolver() {
+        Resolver defaultResolver = getComponent("default");
+        if (defaultResolver != null) return defaultResolver;
+        return getComponent("native.random");
+    }
+
+    private Resolver createNativeRandomResolver() {
+        RandomResolver resolver = new RandomResolver();
+        resolver.initId(ComponentId.fromString(RandomResolver.nativeId));
+        return resolver;
+    }
+
+    private DeterministicResolver createNativeDeterministicResolver() {
+        DeterministicResolver resolver = new DeterministicResolver();
+        resolver.initId(ComponentId.fromString(DeterministicResolver.nativeId));
+        return resolver;
+    }
+
+    private void registerResolver(Resolver resolver) {
+        super.register(resolver.getId(), resolver);
+    }
+
+    public Resolver defaultResolver() { return defaultResolver; }
+
+}