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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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.hazelcast.org.apache.calcite.util;
import com.hazelcast.org.apache.calcite.rel.metadata.NullSentinel;
import com.hazelcast.com.google.common.collect.Collections2;
import com.hazelcast.com.google.common.collect.ImmutableSet;
import com.hazelcast.com.google.common.collect.Iterables;
import com.hazelcast.com.google.common.collect.Iterators;
import com.hazelcast.org.checkerframework.checker.nullness.qual.NonNull;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import static com.hazelcast.org.apache.calcite.linq4j.Nullness.castNonNull;
/**
* An immutable set that may contain null values.
*
*
If the set cannot contain null values, use {@link ImmutableSet}.
*
*
We do not yet support sorted sets.
*
* @param Element type
*/
public class ImmutableNullableSet extends AbstractSet {
@SuppressWarnings("rawtypes")
private static final Set SINGLETON_NULL =
new ImmutableNullableSet(ImmutableSet.of(NullSentinel.INSTANCE));
private static final Set SINGLETON = Collections.singleton(0);
private final ImmutableSet