com.google.common.collect

Class ImmutableTable<R,C,V>

java.lang.Object

com.google.common.collect.ImmutableTable<R,C,V>

All Implemented Interfaces:

Table<R,C,V>, Serializable

@GwtCompatible
public abstract class ImmutableTable<R,C,V>
extends Object
implements Serializable

A Table whose contents will never change, with many other important properties detailed at ImmutableCollection.

See the Guava User Guide article on immutable collections.

Since:

11.0

Author:

Gregory Kick

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ImmutableTable.Builder<R,C,V> A builder for creating immutable table instances, especially public static final tables ("constant tables").

Nested classes/interfaces inherited from interface com.google.common.collect.Table

Table.Cell<R,C,V>

Method Summary

Modifier and Type	Method and Description
static <R,C,V> ImmutableTable.Builder<R,C,V>	builder() Returns a new builder.
ImmutableSet<Table.Cell<R,C,V>>	cellSet() Returns a set of all row key / column key / value triplets.
void	clear() Deprecated. Unsupported operation.
ImmutableMap<R,V>	column(C columnKey) Returns a view of all mappings that have the given column key.
ImmutableSet<C>	columnKeySet() Returns a set of column keys that have one or more values in the table.
abstract ImmutableMap<C,Map<R,V>>	columnMap() Returns a view that associates each column key with the corresponding map from row keys to values.
boolean	contains(Object rowKey, Object columnKey) Returns true if the table contains a mapping with the specified row and column keys.
boolean	containsColumn(Object columnKey) Returns true if the table contains a mapping with the specified column.
boolean	containsRow(Object rowKey) Returns true if the table contains a mapping with the specified row key.
boolean	containsValue(Object value) Returns true if the table contains a mapping with the specified value.
static <R,C,V> ImmutableTable<R,C,V>	copyOf(Table<? extends R,? extends C,? extends V> table) Returns an immutable copy of the provided table.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
V	get(Object rowKey, Object columnKey) Returns the value corresponding to the given row and column keys, or null if no such mapping exists.
int	hashCode() Returns a hash code value for the object.
boolean	isEmpty() Returns true if the table contains no mappings.
static <R,C,V> ImmutableTable<R,C,V>	of() Returns an empty immutable table.
static <R,C,V> ImmutableTable<R,C,V>	of(R rowKey, C columnKey, V value) Returns an immutable table containing a single cell.
V	put(R rowKey, C columnKey, V value) Deprecated. Unsupported operation.
void	putAll(Table<? extends R,? extends C,? extends V> table) Deprecated. Unsupported operation.
V	remove(Object rowKey, Object columnKey) Deprecated. Unsupported operation.
ImmutableMap<C,V>	row(R rowKey) Returns a view of all mappings that have the given row key.
ImmutableSet<R>	rowKeySet() Returns a set of row keys that have one or more values in the table.
abstract ImmutableMap<R,Map<C,V>>	rowMap() Returns a view that associates each row key with the corresponding map from column keys to values.
static <T,R,C,V> Collector<T,?,ImmutableTable<R,C,V>>	toImmutableTable(Function<? super T,? extends R> rowFunction, Function<? super T,? extends C> columnFunction, Function<? super T,? extends V> valueFunction) Returns a Collector that accumulates elements into an ImmutableTable.
static <T,R,C,V> Collector<T,?,ImmutableTable<R,C,V>>	toImmutableTable(Function<? super T,? extends R> rowFunction, Function<? super T,? extends C> columnFunction, Function<? super T,? extends V> valueFunction, BinaryOperator<V> mergeFunction) Returns a Collector that accumulates elements into an ImmutableTable.
String	toString() Returns the string representation rowMap().toString().
ImmutableCollection<V>	values() Returns a collection of all values, which may contain duplicates.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.collect.Table

size

Method Detail

toImmutableTable

@Beta
public static <T,R,C,V> Collector<T,?,ImmutableTable<R,C,V>> toImmutableTable(Function<? super T,? extends R> rowFunction,
                                                                                    Function<? super T,? extends C> columnFunction,
                                                                                    Function<? super T,? extends V> valueFunction)

Returns a Collector that accumulates elements into an ImmutableTable. Each input element is mapped to one cell in the returned table, with the rows, columns, and values generated by applying the specified functions.

The returned Collector will throw a NullPointerException at collection time if the row, column, or value functions return null on any input.

Since:

21.0

toImmutableTable

public static <T,R,C,V> Collector<T,?,ImmutableTable<R,C,V>> toImmutableTable(Function<? super T,? extends R> rowFunction,
                                                                              Function<? super T,? extends C> columnFunction,
                                                                              Function<? super T,? extends V> valueFunction,
                                                                              BinaryOperator<V> mergeFunction)

Returns a Collector that accumulates elements into an ImmutableTable. Each input element is mapped to one cell in the returned table, with the rows, columns, and values generated by applying the specified functions. If multiple inputs are mapped to the same row and column pair, they will be combined with the specified merging function in encounter order.

The returned Collector will throw a NullPointerException at collection time if the row, column, value, or merging functions return null on any input.

Since:

21.0

of

public static <R,C,V> ImmutableTable<R,C,V> of()

Returns an empty immutable table.

of

public static <R,C,V> ImmutableTable<R,C,V> of(R rowKey,
                                               C columnKey,
                                               V value)

Returns an immutable table containing a single cell.

copyOf

public static <R,C,V> ImmutableTable<R,C,V> copyOf(Table<? extends R,? extends C,? extends V> table)

Returns an immutable copy of the provided table.

The Table.cellSet() iteration order of the provided table determines the iteration ordering of all views in the returned table. Note that some views of the original table and the copied table may have different iteration orders. For more control over the ordering, create a ImmutableTable.Builder and call ImmutableTable.Builder.orderRowsBy(java.util.Comparator<? super R>), ImmutableTable.Builder.orderColumnsBy(java.util.Comparator<? super C>), and ImmutableTable.Builder.putAll(com.google.common.collect.Table<? extends R, ? extends C, ? extends V>)

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

builder

public static <R,C,V> ImmutableTable.Builder<R,C,V> builder()

Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableTable.Builder() constructor.

cellSet

public ImmutableSet<Table.Cell<R,C,V>> cellSet()

Description copied from interface: Table

Returns a set of all row key / column key / value triplets. Changes to the returned set will update the underlying table, and vice versa. The cell set does not support the add or addAll methods.

Specified by:

cellSet in interface Table<R,C,V>

Returns:

set of table cells consisting of row key / column key / value triplets

values

public ImmutableCollection<V> values()

Description copied from interface: Table

Returns a collection of all values, which may contain duplicates. Changes to the returned collection will update the underlying table, and vice versa.

Specified by:

values in interface Table<R,C,V>

Returns:

collection of values

column

public ImmutableMap<R,V> column(C columnKey)

Returns a view of all mappings that have the given column key. For each row key / column key / value mapping in the table with that column key, the returned map associates the row key with the value. If no mappings in the table have the provided column key, an empty map is returned.

Changes to the returned map will update the underlying table, and vice versa.

Specified by:

column in interface Table<R,C,V>

Parameters:

columnKey - key of column to search for in the table

Returns:

the corresponding map from row keys to values

Throws:

NullPointerException - if columnKey is null

columnKeySet

public ImmutableSet<C> columnKeySet()

Description copied from interface: Table

Returns a set of column keys that have one or more values in the table. Changes to the set will update the underlying table, and vice versa.

Specified by:

columnKeySet in interface Table<R,C,V>

Returns:

set of column keys

columnMap

public abstract ImmutableMap<C,Map<R,V>> columnMap()

Returns a view that associates each column key with the corresponding map from row keys to values. Changes to the returned map will update this table. The returned map does not support put() or putAll(), or setValue() on its entries.

In contrast, the maps returned by columnMap().get() have the same behavior as those returned by Table.column(C). Those maps may support setValue(), put(), and putAll().

The value Map<R, V> instances in the returned map are ImmutableMap instances as well.

Specified by:

columnMap in interface Table<R,C,V>

Returns:

a map view from each column key to a secondary map from row keys to values

row

public ImmutableMap<C,V> row(R rowKey)

Returns a view of all mappings that have the given row key. For each row key / column key / value mapping in the table with that row key, the returned map associates the column key with the value. If no mappings in the table have the provided row key, an empty map is returned.

Changes to the returned map will update the underlying table, and vice versa.

Specified by:

row in interface Table<R,C,V>

Parameters:

rowKey - key of row to search for in the table

Returns:

the corresponding map from column keys to values

Throws:

NullPointerException - if rowKey is null

rowKeySet

public ImmutableSet<R> rowKeySet()

Description copied from interface: Table

Returns a set of row keys that have one or more values in the table. Changes to the set will update the underlying table, and vice versa.

Specified by:

rowKeySet in interface Table<R,C,V>

Returns:

set of row keys

rowMap

public abstract ImmutableMap<R,Map<C,V>> rowMap()

Returns a view that associates each row key with the corresponding map from column keys to values. Changes to the returned map will update this table. The returned map does not support put() or putAll(), or setValue() on its entries.

In contrast, the maps returned by rowMap().get() have the same behavior as those returned by Table.row(R). Those maps may support setValue(), put(), and putAll().

The value Map<C, V> instances in the returned map are ImmutableMap instances as well.

Specified by:

rowMap in interface Table<R,C,V>

Returns:

a map view from each row key to a secondary map from column keys to values

contains

public boolean contains(@Nullable
                        Object rowKey,
                        @Nullable
                        Object columnKey)

Description copied from interface: Table

Returns true if the table contains a mapping with the specified row and column keys.

Specified by:

contains in interface Table<R,C,V>

Parameters:

rowKey - key of row to search for

columnKey - key of column to search for

containsValue

public boolean containsValue(@Nullable
                             Object value)

Description copied from interface: Table

Returns true if the table contains a mapping with the specified value.

Specified by:

containsValue in interface Table<R,C,V>

Parameters:

value - value to search for

clear

@Deprecated
public final void clear()

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the table unmodified.

Specified by:

clear in interface Table<R,C,V>

Throws:

UnsupportedOperationException - always

put

@Deprecated
public final V put(R rowKey,
                               C columnKey,
                               V value)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the table unmodified.

Specified by:

put in interface Table<R,C,V>

Parameters:

rowKey - row key that the value should be associated with

columnKey - column key that the value should be associated with

value - value to be associated with the specified keys

Returns:

the value previously associated with the keys, or null if no mapping existed for the keys

Throws:

UnsupportedOperationException - always

putAll

@Deprecated
public final void putAll(Table<? extends R,? extends C,? extends V> table)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the table unmodified.

Specified by:

putAll in interface Table<R,C,V>

Parameters:

table - the table to add to this table

Throws:

UnsupportedOperationException - always

remove

@Deprecated
public final V remove(Object rowKey,
                                  Object columnKey)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the table unmodified.

Specified by:

remove in interface Table<R,C,V>

Parameters:

rowKey - row key of mapping to be removed

columnKey - column key of mapping to be removed

Returns:

the value previously associated with the keys, or null if no such value existed

Throws:

UnsupportedOperationException - always

containsRow

public boolean containsRow(@Nullable
                           Object rowKey)

Description copied from interface: Table

Returns true if the table contains a mapping with the specified row key.

Specified by:

containsRow in interface Table<R,C,V>

Parameters:

rowKey - key of row to search for

containsColumn

public boolean containsColumn(@Nullable
                              Object columnKey)

Description copied from interface: Table

Returns true if the table contains a mapping with the specified column.

Specified by:

containsColumn in interface Table<R,C,V>

Parameters:

columnKey - key of column to search for

get

public V get(@Nullable
             Object rowKey,
             @Nullable
             Object columnKey)

Description copied from interface: Table

Returns the value corresponding to the given row and column keys, or null if no such mapping exists.

Specified by:

get in interface Table<R,C,V>

Parameters:

rowKey - key of row to search for

columnKey - key of column to search for

isEmpty

public boolean isEmpty()

Description copied from interface: Table

Returns true if the table contains no mappings.

Specified by:

isEmpty in interface Table<R,C,V>

equals

public boolean equals(@Nullable
                      Object obj)

Description copied from class: java.lang.Object

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Specified by:

equals in interface Table<R,C,V>

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Description copied from class: java.lang.Object

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

Specified by:

hashCode in interface Table<R,C,V>

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

toString

public String toString()

Returns the string representation rowMap().toString().

Overrides:

toString in class Object

Returns:

a string representation of the object.