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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 com.google.common.annotations.GwtIncompatible;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.LinkedHashMap;

/**
 * A {@code Multiset} implementation with predictable iteration order. Its iterator orders elements
 * according to when the first occurrence of the element was added. When the multiset contains
 * multiple instances of an element, those instances are consecutive in the iteration order. If all
 * occurrences of an element are removed, after which that element is added to the multiset, the
 * element will appear at the end of the iteration.
 *
 * 

See the Guava User Guide article on {@code * Multiset}. * * @author Kevin Bourrillion * @author Jared Levy * @since 2.0 */ @GwtCompatible(serializable = true, emulated = true) @SuppressWarnings("serial") // we're overriding default serialization public final class LinkedHashMultiset extends AbstractMapBasedMultiset { /** Creates a new, empty {@code LinkedHashMultiset} using the default initial capacity. */ public static LinkedHashMultiset create() { return new LinkedHashMultiset(); } /** * Creates a new, empty {@code LinkedHashMultiset} 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 LinkedHashMultiset create(int distinctElements) { return new LinkedHashMultiset(distinctElements); } /** * Creates a new {@code LinkedHashMultiset} containing the specified elements. * *

This implementation is highly efficient when {@code elements} is itself a {@link Multiset}. * * @param elements the elements that the multiset should contain */ public static LinkedHashMultiset create(Iterable elements) { LinkedHashMultiset multiset = create(Multisets.inferDistinctElements(elements)); Iterables.addAll(multiset, elements); return multiset; } private LinkedHashMultiset() { super(new LinkedHashMap()); } private LinkedHashMultiset(int distinctElements) { super(Maps.newLinkedHashMapWithExpectedSize(distinctElements)); } /** * @serialData the number of distinct elements, the first element, its count, the second element, * its count, and so on */ @GwtIncompatible // java.io.ObjectOutputStream private void writeObject(ObjectOutputStream stream) throws IOException { stream.defaultWriteObject(); Serialization.writeMultiset(this, stream); } @GwtIncompatible // java.io.ObjectInputStream private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); int distinctElements = Serialization.readCount(stream); setBackingMap(new LinkedHashMap()); Serialization.populateMultiset(this, stream, distinctElements); } @GwtIncompatible // not needed in emulated source private static final long serialVersionUID = 0; }





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