com.google.common.collect.EmptyContiguousSet Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011 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.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.io.Serializable;
import java.util.NoSuchElementException;
import java.util.Set;
import javax.annotation.Nullable;

/**
 *  An empty contiguous set.
 *
 *  @author Gregory Kick
 *
 * @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
 */
@GwtCompatible(emulated = true)
// allow ungenerified Comparable types
@SuppressWarnings("unchecked")
@Deprecated(since = "2022-12-01")
final class EmptyContiguousSet extends ContiguousSet {

    EmptyContiguousSet(DiscreteDomain domain) {
        super(domain);
    }

    @Override
    public C first() {
        throw new NoSuchElementException();
    }

    @Override
    public C last() {
        throw new NoSuchElementException();
    }

    @Override
    public int size() {
        return 0;
    }

    @Override
    public ContiguousSet intersection(ContiguousSet other) {
        return this;
    }

    @Override
    public Range range() {
        throw new NoSuchElementException();
    }

    @Override
    public Range range(BoundType lowerBoundType, BoundType upperBoundType) {
        throw new NoSuchElementException();
    }

    @Override
    ContiguousSet headSetImpl(C toElement, boolean inclusive) {
        return this;
    }

    @Override
    ContiguousSet subSetImpl(C fromElement, boolean fromInclusive, C toElement, boolean toInclusive) {
        return this;
    }

    @Override
    ContiguousSet tailSetImpl(C fromElement, boolean fromInclusive) {
        return this;
    }

    @GwtIncompatible("not used by GWT emulation")
    @Override
    int indexOf(Object target) {
        return -1;
    }

    @Override
    public UnmodifiableIterator iterator() {
        return Iterators.emptyIterator();
    }

    @GwtIncompatible("NavigableSet")
    @Override
    public UnmodifiableIterator descendingIterator() {
        return Iterators.emptyIterator();
    }

    @Override
    boolean isPartialView() {
        return false;
    }

    @Override
    public boolean isEmpty() {
        return true;
    }

    @Override
    public ImmutableList asList() {
        return ImmutableList.of();
    }

    @Override
    public String toString() {
        return "[]";
    }

    @Override
    public boolean equals(@Nullable Object object) {
        if (object instanceof Set) {
            Set that = (Set) object;
            return that.isEmpty();
        }
        return false;
    }

    @Override
    public int hashCode() {
        return 0;
    }

    // @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
    @GwtIncompatible("serialization")
    @Deprecated(since = "2022-12-01")
    private static final class SerializedForm implements Serializable {

        private final DiscreteDomain domain;

        private SerializedForm(DiscreteDomain domain) {
            this.domain = domain;
        }

        private Object readResolve() {
            return new EmptyContiguousSet(domain);
        }

        private static final long serialVersionUID = 0;
    }

    @GwtIncompatible("serialization")
    @Override
    Object writeReplace() {
        return new SerializedForm(domain);
    }

    @GwtIncompatible("NavigableSet")
    ImmutableSortedSet createDescendingSet() {
        return new EmptyImmutableSortedSet(Ordering.natural().reverse());
    }
}