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    • com.google.common.collect.EmptyImmutableSet Maven / Gradle / Ivy

    There is a newer version: 2024.11.18751.20241128T090041Z-241100
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    /*
 * Copyright (C) 2007 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 java.util.Collection;
import java.util.Set;
import javax.annotation.Nullable;

/**
 *  An empty immutable set.
 *
 *  @author Kevin Bourrillion
 *
 * @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
 */
@GwtCompatible(serializable = true, emulated = true)
@Deprecated(since = "2022-12-01")
final class EmptyImmutableSet extends ImmutableSet {

    static final EmptyImmutableSet INSTANCE = new EmptyImmutableSet();

    private EmptyImmutableSet() {
    }

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

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

    @Override
    public boolean contains(@Nullable Object target) {
        return false;
    }

    @Override
    public boolean containsAll(Collection targets) {
        return targets.isEmpty();
    }

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

    @Override
    boolean isPartialView() {
        return false;
    }

    @Override
    int copyIntoArray(Object[] dst, int offset) {
        return offset;
    }

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

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

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

    @Override
    boolean isHashCodeFast() {
        return true;
    }

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

    Object readResolve() {
        // preserve singleton property
        return INSTANCE;
    }

    private static final long serialVersionUID = 0;
}
    
    
    
    

    




    
    
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