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A copy of the google collections 1.0 library, with the package name changed to avoid conflicts, and with all logging removed to prevent logging problems that can occur when attempting to use JUL in a javaagent.

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/*
 * 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.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;

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

/**
 * Multiset implementation backed by a {@link HashMap}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 */
@GwtCompatible(serializable = true)
public final class HashMultiset extends AbstractMapBasedMultiset {

    /**
     * Creates a new, empty {@code HashMultiset} using the default initial
     * capacity.
     */
    public static  HashMultiset create() {
        return new HashMultiset();
    }

    /**
     * Creates a new, empty {@code HashMultiset} with the specified expected
     * number of distinct elements.
     *
     * @param distinctElements the expected number of distinct elements
     * @throws IllegalArgumentException if {@code distinctElements} is negative
     */
    public static  HashMultiset create(int distinctElements) {
        return new HashMultiset(distinctElements);
    }

    /**
     * Creates a new {@code HashMultiset} containing the specified elements.
     *
     * @param elements the elements that the multiset should contain
     */
    public static  HashMultiset create(Iterable elements) {
        HashMultiset multiset =
                create(Multisets.inferDistinctElements(elements));
        Iterables.addAll(multiset, elements);
        return multiset;
    }

    private HashMultiset() {
        super(new HashMap());
    }

    private HashMultiset(int distinctElements) {
        super(new HashMap(Maps.capacity(distinctElements)));
    }

    /**
     * @serialData the number of distinct elements, the first element, its count,
     * the second element, its count, and so on
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        Serialization.writeMultiset(this, stream);
    }

    private void readObject(ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        int distinctElements = Serialization.readCount(stream);
        setBackingMap(
                Maps.newHashMapWithExpectedSize(distinctElements));
        Serialization.populateMultiset(this, stream, distinctElements);
    }

    private static final long serialVersionUID = 0;
}