com.google.common.collect
Class ImmutableSortedMap<K,V>

java.lang.Object
  com.google.common.collect.ImmutableMap<K,V>
      com.google.common.collect.ImmutableSortedMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>, SortedMap<K,V>

public class ImmutableSortedMap<K,V>
extends ImmutableMap<K,V>
implements SortedMap<K,V>

An immutable SortedMap. Does not permit null keys or values.

Unlike Collections.unmodifiableSortedMap(java.util.SortedMap), which is a view of a separate map which can still change, an instance of ImmutableSortedMap contains its own data and will never change. ImmutableSortedMap is convenient for public static final maps ("constant maps") and also lets you easily make a "defensive copy" of a map provided to your class by a caller.

Note: Although this class is not final, it cannot be subclassed as it has no public or protected constructors. Thus, instances of this class are guaranteed to be immutable.

Since:

2010.01.04 stable (imported from Google Collections Library)

Author:

Jared Levy

See Also:

Serialized Form

Nested Class Summary

static class

ImmutableSortedMap.Builder<K,V> A builder for creating immutable sorted map instances, especially public static final maps ("constant maps").

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

static <K,V> ImmutableSortedMap.Builder<K,V>	builder() Deprecated. Use naturalOrder(), which offers better type-safety.
Comparator<? super K>	comparator() Returns the comparator that orders the keys, which is Ordering.natural() when the natural ordering of the keys is used.
boolean	containsValue(Object value)
static <K,V> ImmutableSortedMap<K,V>	copyOf(Map<? extends K,? extends V> map) Returns an immutable map containing the same entries as map, sorted by the natural ordering of the keys.
static <K,V> ImmutableSortedMap<K,V>	copyOf(Map<? extends K,? extends V> map, Comparator<? super K> comparator) Returns an immutable map containing the same entries as map, with keys sorted by the provided comparator.
static <K,V> ImmutableSortedMap<K,V>	copyOfSorted(SortedMap<K,? extends V> map) Returns an immutable map containing the same entries as the provided sorted map, with the same ordering.
ImmutableSet<Map.Entry<K,V>>	entrySet() Returns an immutable set of the mappings in this map, sorted by the key ordering.
K	firstKey()
V	get(Object key)
ImmutableSortedMap<K,V>	headMap(K toKey) This method returns a ImmutableSortedMap, consisting of the entries whose keys are less than toKey.
ImmutableSortedSet<K>	keySet() Returns an immutable sorted set of the keys in this map.
K	lastKey()
static <K extends Comparable<K>,V> ImmutableSortedMap.Builder<K,V>	naturalOrder() Returns a builder that creates immutable sorted maps whose keys are ordered by their natural ordering.
static <K,V> ImmutableSortedMap<K,V>	of() Returns the empty sorted map.
static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V>	of(K k1, V v1) Returns an immutable map containing a single entry.
static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V>	of(K k1, V v1, K k2, V v2) Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.
static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3) Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.
static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.
static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.
static <K,V> ImmutableSortedMap.Builder<K,V>	orderedBy(Comparator<K> comparator) Returns a builder that creates immutable sorted maps with an explicit comparator.
static <K extends Comparable<K>,V> ImmutableSortedMap.Builder<K,V>	reverseOrder() Returns a builder that creates immutable sorted maps whose keys are ordered by the reverse of their natural ordering.
int	size()
ImmutableSortedMap<K,V>	subMap(K fromKey, K toKey) This method returns a ImmutableSortedMap, consisting of the entries whose keys ranges from fromKey, inclusive, to toKey, exclusive.
ImmutableSortedMap<K,V>	tailMap(K fromKey) This method returns a ImmutableSortedMap, consisting of the entries whose keys are greater than or equals to fromKey.
ImmutableCollection<V>	values() Returns an immutable collection of the values in this map, sorted by the ordering of the corresponding keys.

Methods inherited from class com.google.common.collect.ImmutableMap

clear, containsKey, equals, hashCode, isEmpty, put, putAll, remove, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

clear, containsKey, equals, hashCode, isEmpty, put, putAll, remove

Method Detail

of

public static <K,V> ImmutableSortedMap<K,V> of()

Returns the empty sorted map.

of

public static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V> of(K k1,
                                                                             V v1)

Returns an immutable map containing a single entry.

of

public static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V> of(K k1,
                                                                             V v1,
                                                                             K k2,
                                                                             V v2)

Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.

Throws:

IllegalArgumentException - if the two keys are equal according to their natural ordering

of

public static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V> of(K k1,
                                                                             V v1,
                                                                             K k2,
                                                                             V v2,
                                                                             K k3,
                                                                             V v3)

Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.

Throws:

IllegalArgumentException - if any two keys are equal according to their natural ordering

of

public static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V> of(K k1,
                                                                             V v1,
                                                                             K k2,
                                                                             V v2,
                                                                             K k3,
                                                                             V v3,
                                                                             K k4,
                                                                             V v4)

Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.

Throws:

IllegalArgumentException - if any two keys are equal according to their natural ordering

of

public static <K extends Comparable<? super K>,V> ImmutableSortedMap<K,V> of(K k1,
                                                                             V v1,
                                                                             K k2,
                                                                             V v2,
                                                                             K k3,
                                                                             V v3,
                                                                             K k4,
                                                                             V v4,
                                                                             K k5,
                                                                             V v5)

Returns an immutable sorted map containing the given entries, sorted by the natural ordering of their keys.

Throws:

IllegalArgumentException - if any two keys are equal according to their natural ordering

copyOf

public static <K,V> ImmutableSortedMap<K,V> copyOf(Map<? extends K,? extends V> map)

Returns an immutable map containing the same entries as map, sorted by the natural ordering of the keys.

Note: Despite what the method name suggests, if map is an ImmutableSortedMap, it may be returned instead of a copy.

This method is not type-safe, as it may be called on a map with keys that are not mutually comparable.

Throws:

ClassCastException - if the keys in map are not mutually comparable

NullPointerException - if any key or value in map is null

IllegalArgumentException - if any two keys are equal according to their natural ordering

copyOf

public static <K,V> ImmutableSortedMap<K,V> copyOf(Map<? extends K,? extends V> map,
                                                   Comparator<? super K> comparator)

Returns an immutable map containing the same entries as map, with keys sorted by the provided comparator.

Note: Despite what the method name suggests, if map is an ImmutableSortedMap, it may be returned instead of a copy.

Throws:

NullPointerException - if any key or value in map is null

IllegalArgumentException - if any two keys are equal according to the comparator

copyOfSorted

public static <K,V> ImmutableSortedMap<K,V> copyOfSorted(SortedMap<K,? extends V> map)

Returns an immutable map containing the same entries as the provided sorted map, with the same ordering.

Note: Despite what the method name suggests, if map is an ImmutableSortedMap, it may be returned instead of a copy.

Throws:

NullPointerException - if any key or value in map is null

naturalOrder

public static <K extends Comparable<K>,V> ImmutableSortedMap.Builder<K,V> naturalOrder()

Returns a builder that creates immutable sorted maps whose keys are ordered by their natural ordering. The sorted maps use Ordering.natural() as the comparator.

Note: the type parameter K extends Comparable<K> rather than Comparable<? super K> as a workaround for javac bug 6468354.

orderedBy

public static <K,V> ImmutableSortedMap.Builder<K,V> orderedBy(Comparator<K> comparator)

Returns a builder that creates immutable sorted maps with an explicit comparator. If the comparator has a more general type than the map's keys, such as creating a SortedMap<Integer, String> with a Comparator<Number>, use the ImmutableSortedMap.Builder constructor instead.

Throws:

NullPointerException - if comparator is null

reverseOrder

public static <K extends Comparable<K>,V> ImmutableSortedMap.Builder<K,V> reverseOrder()

Returns a builder that creates immutable sorted maps whose keys are ordered by the reverse of their natural ordering.

Note: the type parameter K extends Comparable<K> rather than Comparable<? super K> as a workaround for javac bug 6468354.

size

public int size()

Specified by:

size in interface Map<K,V>

get

public V get(@Nullable
             Object key)

Specified by:

get in interface Map<K,V>

Specified by:

get in class ImmutableMap<K,V>

containsValue

public boolean containsValue(@Nullable
                             Object value)

Specified by:

containsValue in interface Map<K,V>

Specified by:

containsValue in class ImmutableMap<K,V>

entrySet

public ImmutableSet<Map.Entry<K,V>> entrySet()

Returns an immutable set of the mappings in this map, sorted by the key ordering.

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in interface SortedMap<K,V>

Specified by:

entrySet in class ImmutableMap<K,V>

keySet

public ImmutableSortedSet<K> keySet()

Returns an immutable sorted set of the keys in this map.

Specified by:

keySet in interface Map<K,V>

Specified by:

keySet in interface SortedMap<K,V>

Specified by:

keySet in class ImmutableMap<K,V>

values

public ImmutableCollection<V> values()

Returns an immutable collection of the values in this map, sorted by the ordering of the corresponding keys.

Specified by:

values in interface Map<K,V>

Specified by:

values in interface SortedMap<K,V>

Specified by:

values in class ImmutableMap<K,V>

comparator

public Comparator<? super K> comparator()

Returns the comparator that orders the keys, which is Ordering.natural() when the natural ordering of the keys is used. Note that its behavior is not consistent with TreeMap.comparator(), which returns null to indicate natural ordering.

Specified by:

comparator in interface SortedMap<K,V>

firstKey

public K firstKey()

Specified by:

firstKey in interface SortedMap<K,V>

lastKey

public K lastKey()

Specified by:

lastKey in interface SortedMap<K,V>

headMap

public ImmutableSortedMap<K,V> headMap(K toKey)

This method returns a ImmutableSortedMap, consisting of the entries whose keys are less than toKey.

The SortedMap.headMap(K) documentation states that a submap of a submap throws an IllegalArgumentException if passed a toKey greater than an earlier toKey. However, this method doesn't throw an exception in that situation, but instead keeps the original toKey.

Specified by:

headMap in interface SortedMap<K,V>

subMap

public ImmutableSortedMap<K,V> subMap(K fromKey,
                                      K toKey)

This method returns a ImmutableSortedMap, consisting of the entries whose keys ranges from fromKey, inclusive, to toKey, exclusive.

The SortedMap.subMap(K, K) documentation states that a submap of a submap throws an IllegalArgumentException if passed a fromKey less than an earlier fromKey. However, this method doesn't throw an exception in that situation, but instead keeps the original fromKey. Similarly, this method keeps the original toKey, instead of throwing an exception, if passed a toKey greater than an earlier toKey.

Specified by:

subMap in interface SortedMap<K,V>

tailMap

public ImmutableSortedMap<K,V> tailMap(K fromKey)

This method returns a ImmutableSortedMap, consisting of the entries whose keys are greater than or equals to fromKey.

The SortedMap.tailMap(K) documentation states that a submap of a submap throws an IllegalArgumentException if passed a fromKey less than an earlier fromKey. However, this method doesn't throw an exception in that situation, but instead keeps the original fromKey.

Specified by:

tailMap in interface SortedMap<K,V>

builder

@Deprecated
public static <K,V> ImmutableSortedMap.Builder<K,V> builder()

Deprecated. Use naturalOrder(), which offers better type-safety.

Not supported. Use naturalOrder(), which offers better type-safety, instead. This method exists only to hide ImmutableMap.builder() from consumers of ImmutableSortedMap.

Throws:

UnsupportedOperationException - always