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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.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NavigableSet;
import java.util.Set;
/**
* A {@link Multiset} which maintains the ordering of its elements, according to either their
* natural order or an explicit {@link Comparator}. This order is reflected when iterating over the
* sorted multiset, either directly, or through its {@code elementSet} or {@code entrySet} views. In
* all cases, this implementation uses {@link Comparable#compareTo} or {@link Comparator#compare}
* instead of {@link Object#equals} to determine equivalence of instances.
*
* Warning: The comparison must be consistent with equals as explained by the
* {@link Comparable} class specification. Otherwise, the resulting multiset will violate the {@link
* Collection} contract, which it is specified in terms of {@link Object#equals}.
*
*
See the Guava User Guide article on {@code
* Multiset}.
*
* @author Louis Wasserman
* @since 11.0
*/
@GwtCompatible(emulated = true)
public interface SortedMultiset extends SortedMultisetBridge, SortedIterable {
/**
* Returns the comparator that orders this multiset, or {@link Ordering#natural()} if the natural
* ordering of the elements is used.
*/
@Override
Comparator comparator();
/**
* Returns the entry of the first element in this multiset, or {@code null} if this multiset is
* empty.
*/
Entry firstEntry();
/**
* Returns the entry of the last element in this multiset, or {@code null} if this multiset is
* empty.
*/
Entry lastEntry();
/**
* Returns and removes the entry associated with the lowest element in this multiset, or returns
* {@code null} if this multiset is empty.
*/
Entry pollFirstEntry();
/**
* Returns and removes the entry associated with the greatest element in this multiset, or returns
* {@code null} if this multiset is empty.
*/
Entry pollLastEntry();
/**
* Returns a {@link NavigableSet} view of the distinct elements in this multiset.
*
* @since 14.0 (present with return type {@code SortedSet} since 11.0)
*/
@Override
NavigableSet elementSet();
/**
* {@inheritDoc}
*
* The {@code entrySet}'s iterator returns entries in ascending element order according to the
* this multiset's comparator.
*/
@Override
Set> entrySet();
/**
* {@inheritDoc}
*
* The iterator returns the elements in ascending order according to this multiset's
* comparator.
*/
@Override
Iterator iterator();
/**
* Returns a descending view of this multiset. Modifications made to either map will be reflected
* in the other.
*/
SortedMultiset descendingMultiset();
/**
* Returns a view of this multiset restricted to the elements less than {@code upperBound},
* optionally including {@code upperBound} itself. The returned multiset is a view of this
* multiset, so changes to one will be reflected in the other. The returned multiset supports all
* operations that this multiset supports.
*
* The returned multiset will throw an {@link IllegalArgumentException} on attempts to add
* elements outside its range.
*/
SortedMultiset headMultiset(E upperBound, BoundType boundType);
/**
* Returns a view of this multiset restricted to the range between {@code lowerBound} and {@code
* upperBound}. The returned multiset is a view of this multiset, so changes to one will be
* reflected in the other. The returned multiset supports all operations that this multiset
* supports.
*
* The returned multiset will throw an {@link IllegalArgumentException} on attempts to add
* elements outside its range.
*
*
This method is equivalent to {@code tailMultiset(lowerBound,
* lowerBoundType).headMultiset(upperBound, upperBoundType)}.
*/
SortedMultiset subMultiset(
E lowerBound, BoundType lowerBoundType, E upperBound, BoundType upperBoundType);
/**
* Returns a view of this multiset restricted to the elements greater than {@code lowerBound},
* optionally including {@code lowerBound} itself. The returned multiset is a view of this
* multiset, so changes to one will be reflected in the other. The returned multiset supports all
* operations that this multiset supports.
*
* The returned multiset will throw an {@link IllegalArgumentException} on attempts to add
* elements outside its range.
*/
SortedMultiset tailMultiset(E lowerBound, BoundType boundType);
}