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

    /*
 * Copyright (C) 2007 Google Inc.
 *
 * 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 org.fakereplace.com.google.common.collect;

import java.util.Collection;
import java.util.Set;

import org.fakereplace.com.google.common.annotations.GwtCompatible;


/**
 * An empty immutable set.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible(serializable = true)
final class EmptyImmutableSet extends ImmutableSet {
    static final EmptyImmutableSet INSTANCE = new EmptyImmutableSet();

    private EmptyImmutableSet() {
    }

    public int size() {
        return 0;
    }

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

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

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

    private static final Object[] EMPTY_ARRAY = new Object[0];

    @Override
    public Object[] toArray() {
        return EMPTY_ARRAY;
    }

    @Override
    public  T[] toArray(T[] a) {
        if (a.length > 0) {
            a[0] = null;
        }
        return a;
    }

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

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

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

    @Override
    boolean isHashCodeFast() {
        return true;
    }

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

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

    private static final long serialVersionUID = 0;
}
    
    
    
    

    




    
    
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