1 files changed, 75 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/serialization/serializers/ImmutableMultimapSerializer.java b/src/main/java/com/google/devtools/build/lib/skyframe/serialization/serializers/ImmutableMultimapSerializer.java
new file mode 100644
index 0000000000..98b4e7b970
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/serialization/serializers/ImmutableMultimapSerializer.java
@@ -0,0 +1,75 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// 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.devtools.build.lib.skyframe.serialization.serializers;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableMultimap;
+import com.google.common.collect.ImmutableSetMultimap;
+import java.util.Collection;
+import java.util.Map;
+
+/** {@link Serializer} for {@link ImmutableMultimap}. */
+class ImmutableMultimapSerializer extends Serializer<ImmutableMultimap<Object, Object>> {
+
+  private ImmutableMultimapSerializer() {
+    setImmutable(true);
+  }
+
+  @Override
+  public void write(Kryo kryo, Output output, ImmutableMultimap<Object, Object> immutableMultiMap) {
+    kryo.writeObject(output, ImmutableMap.copyOf(immutableMultiMap.asMap()));
+  }
+
+  @Override
+  public ImmutableMultimap<Object, Object> read(
+      Kryo kryo, Input input, Class<ImmutableMultimap<Object, Object>> type) {
+    ImmutableMultimap.Builder<Object, Object> builder;
+    if (type.equals(ImmutableListMultimap.class)) {
+      builder = ImmutableMultimap.builder();
+    } else if (type.equals(ImmutableSetMultimap.class)) {
+      builder = ImmutableSetMultimap.builder();
+    } else {
+      builder = ImmutableMultimap.builder();
+    }
+
+    @SuppressWarnings("unchecked")
+    Map<Object, Collection<Object>> map = kryo.readObject(input, ImmutableMap.class);
+    for (Map.Entry<Object, Collection<Object>> entry : map.entrySet()) {
+      builder.putAll(entry.getKey(), entry.getValue());
+    }
+    return builder.build();
+  }
+
+  static void registerSerializers(Kryo kryo) {
+    ImmutableMultimapSerializer serializer = new ImmutableMultimapSerializer();
+
+    // ImmutableMultimap (abstract class)
+    //  +- EmptyImmutableListMultimap
+    //  +- ImmutableListMultimap
+    //  +- EmptyImmutableSetMultimap
+    //  +- ImmutableSetMultimap
+
+    kryo.register(ImmutableMultimap.class, serializer);
+    kryo.register(ImmutableListMultimap.of().getClass(), serializer);
+    kryo.register(ImmutableListMultimap.of("A", "B").getClass(), serializer);
+    kryo.register(ImmutableSetMultimap.of().getClass(), serializer);
+    kryo.register(ImmutableSetMultimap.of("A", "B").getClass(), serializer);
+  }
+}