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Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. Guava has only one code dependency - javax.annotation, per the JSR-305 spec.

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/*
 * Copyright (C) 2011 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.Map;

import javax.annotation.Nullable;

/**
 * Implementation of {@link ImmutableMultiset} with one or more elements.
 *
 * @author Jared Levy
 * @author Louis Wasserman
 */
@GwtCompatible(serializable = true)
@SuppressWarnings("serial")
// uses writeReplace(), not default serialization
class RegularImmutableMultiset extends ImmutableMultiset {
  private final transient ImmutableMap map;
  private final transient int size;

  RegularImmutableMultiset(ImmutableMap map, int size) {
    this.map = map;
    this.size = size;
  }

  @Override
  boolean isPartialView() {
    return map.isPartialView();
  }

  @Override
  public int count(@Nullable Object element) {
    Integer value = map.get(element);
    return (value == null) ? 0 : value;
  }

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

  @Override
  public boolean contains(@Nullable Object element) {
    return map.containsKey(element);
  }

  @Override
  public ImmutableSet elementSet() {
    return map.keySet();
  }

  private static  Entry entryFromMapEntry(Map.Entry entry) {
    return Multisets.immutableEntry(entry.getKey(), entry.getValue());
  }

  @Override
  ImmutableSet> createEntrySet() {
    return new EntrySet();
  }

  private class EntrySet extends ImmutableMultiset.EntrySet {
    @Override
    public int size() {
      return map.size();
    }

    @Override
    public UnmodifiableIterator> iterator() {
      return asList().iterator();
    }

    @Override
    ImmutableList> createAsList() {
      final ImmutableList> entryList = map.entrySet().asList();
      return new ImmutableAsList>() {
        @Override
        public Entry get(int index) {
          return entryFromMapEntry(entryList.get(index));
        }

        @Override
        ImmutableCollection> delegateCollection() {
          return EntrySet.this;
        }
      };
    }
  }

  @Override
  public int hashCode() {
    return map.hashCode();
  }
}