package com.google.common.collect;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;

/* loaded from: classes3.dex */
public abstract class Iterators {
    public static boolean elementsEqual(Iterator it, Iterator it2) {
        while (it.hasNext()) {
            if (!it2.hasNext() || !Objects.equal(it.next(), it2.next())) {
                return false;
            }
        }
        return !it2.hasNext();
    }

    public static boolean addAll(Collection collection, Iterator it) {
        Preconditions.checkNotNull(collection);
        Preconditions.checkNotNull(it);
        boolean z = false;
        while (it.hasNext()) {
            z |= collection.add(it.next());
        }
        return z;
    }

    public static UnmodifiableIterator singletonIterator(final Object obj) {
        return new UnmodifiableIterator() { // from class: com.google.common.collect.Iterators.9
            public boolean done;

            @Override // java.util.Iterator
            public boolean hasNext() {
                return !this.done;
            }

            @Override // java.util.Iterator
            public Object next() {
                if (this.done) {
                    throw new NoSuchElementException();
                }
                this.done = true;
                return obj;
            }
        };
    }
}