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/*
 * Copyright (C) 2016 The Guava Authors
 *
 * 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.facebook.presto.jdbc.internal.guava.collect;

import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;

/**
 * A dummy superclass to support GWT serialization of the element type of an {@link
 * ImmutableMultiset}. The GWT supersource for this class contains a field of type {@code E}.
 *
 * 

For details about this hack, see {@link GwtSerializationDependencies}, which takes the same * approach but with a subclass rather than a superclass. * *

TODO(cpovirk): Consider applying this subclass approach to our other types. * *

For {@code ImmutableMultiset} in particular, I ran into a problem with the {@code * GwtSerializationDependencies} approach: When autogenerating a serializer for the new class, GWT * tries to refer to our dummy serializer for the superclass, * ImmutableMultiset_CustomFieldSerializer. But that type has no methods (since it's never actually * used). We could probably fix the problem by adding dummy methods to that class, but that is * starting to sound harder than taking the superclass approach, which I've been coming to like, * anyway, since it doesn't require us to declare dummy methods (though occasionally constructors) * and make types non-final. */ @GwtCompatible(emulated = true) abstract class ImmutableMultisetGwtSerializationDependencies extends ImmutableCollection {}





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