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diff --git a/java/com/google/gerrit/index/IndexDefinition.java b/java/com/google/gerrit/index/IndexDefinition.java
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+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.index;
+
+import com.google.common.collect.ImmutableSortedMap;
+import com.google.gerrit.common.Nullable;
+
+/**
+ * Definition of an index over a Gerrit data type.
+ *
+ * <p>An <em>index</em> includes a set of schema definitions along with the specific implementations
+ * used to query the secondary index implementation in a running server. If you are just interested
+ * in the static definition of one or more schemas, see the implementations of {@link
+ * SchemaDefinitions}.
+ */
+public abstract class IndexDefinition<K, V, I extends Index<K, V>> {
+  public interface IndexFactory<K, V, I extends Index<K, V>> {
+    I create(Schema<V> schema);
+  }
+
+  private final SchemaDefinitions<V> schemaDefs;
+  private final IndexCollection<K, V, I> indexCollection;
+  private final IndexFactory<K, V, I> indexFactory;
+  private final SiteIndexer<K, V, I> siteIndexer;
+
+  protected IndexDefinition(
+      SchemaDefinitions<V> schemaDefs,
+      IndexCollection<K, V, I> indexCollection,
+      IndexFactory<K, V, I> indexFactory,
+      @Nullable SiteIndexer<K, V, I> siteIndexer) {
+    this.schemaDefs = schemaDefs;
+    this.indexCollection = indexCollection;
+    this.indexFactory = indexFactory;
+    this.siteIndexer = siteIndexer;
+  }
+
+  public final String getName() {
+    return schemaDefs.getName();
+  }
+
+  public final ImmutableSortedMap<Integer, Schema<V>> getSchemas() {
+    return schemaDefs.getSchemas();
+  }
+
+  public final Schema<V> getLatest() {
+    return schemaDefs.getLatest();
+  }
+
+  public final IndexCollection<K, V, I> getIndexCollection() {
+    return indexCollection;
+  }
+
+  public final IndexFactory<K, V, I> getIndexFactory() {
+    return indexFactory;
+  }
+
+  @Nullable
+  public final SiteIndexer<K, V, I> getSiteIndexer() {
+    return siteIndexer;
+  }
+}