com.google.common.collect
Class ForwardingTable<R,C,V>

java.lang.Object
  extended by com.google.common.collect.ForwardingObject
      extended by com.google.common.collect.ForwardingTable<R,C,V>
All Implemented Interfaces:
Table<R,C,V>

@Beta
@GwtCompatible
public abstract class ForwardingTable<R,C,V>
extends ForwardingObject
implements Table<R,C,V>

A table which forwards all its method calls to another table. Subclasses should override one or more methods to modify the behavior of the backing map as desired per the decorator pattern.

Since:
7
Author:
Gregory Kick

Nested Class Summary
 
Nested classes/interfaces inherited from interface com.google.common.collect.Table
Table.Cell<R,C,V>
 
Constructor Summary
protected ForwardingTable()
          Constructor for use by subclasses.
 
Method Summary
 Set<Table.Cell<R,C,V>> cellSet()
          Returns a set of all row key / column key / value triplets.
 void clear()
          Removes all mappings from the table.
 Map<R,V> column(C columnKey)
          Returns a view of all mappings that have the given column key.
 Set<C> columnKeySet()
          Returns a set of column keys that have one or more values in the table.
 Map<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.
protected abstract  Table<R,C,V> delegate()
          Returns the backing delegate instance that methods are forwarded to.
 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.
 V put(R rowKey, C columnKey, V value)
          Associates the specified value with the specified keys.
 void putAll(Table<? extends R,? extends C,? extends V> table)
          Copies all mappings from the specified table to this table.
 V remove(Object rowKey, Object columnKey)
          Removes the mapping, if any, associated with the given keys.
 Map<C,V> row(R rowKey)
          Returns a view of all mappings that have the given row key.
 Set<R> rowKeySet()
          Returns a set of row keys that have one or more values in the table.
 Map<R,Map<C,V>> rowMap()
          Returns a view that associates each row key with the corresponding map from column keys to values.
 int size()
          Returns the number of row key / column key / value mappings in the table.
 Collection<V> values()
          Returns a collection of all values, which may contain duplicates.
 
Methods inherited from class com.google.common.collect.ForwardingObject
toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ForwardingTable

protected ForwardingTable()
Constructor for use by subclasses.

Method Detail

delegate

protected abstract Table<R,C,V> delegate()
Description copied from class: ForwardingObject
Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:
delegate in class ForwardingObject

cellSet

public Set<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

clear

public void clear()
Description copied from interface: Table
Removes all mappings from the table.

Specified by:
clear in interface Table<R,C,V>

column

public Map<R,V> column(C columnKey)
Description copied from interface: Table
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

columnKeySet

public Set<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 Map<C,Map<R,V>> columnMap()
Description copied from interface: Table
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().

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

contains

public boolean contains(Object rowKey,
                        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

containsColumn

public boolean containsColumn(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

containsRow

public boolean containsRow(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

containsValue

public boolean containsValue(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

get

public V get(Object rowKey,
             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>

put

public V put(R rowKey,
             C columnKey,
             V value)
Description copied from interface: Table
Associates the specified value with the specified keys. If the table already contained a mapping for those keys, the old value is replaced with the specified value.

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

putAll

public void putAll(Table<? extends R,? extends C,? extends V> table)
Description copied from interface: Table
Copies all mappings from the specified table to this table. The effect is equivalent to calling Table.put(R, C, V) with each row key / column key / value mapping in table.

Specified by:
putAll in interface Table<R,C,V>
Parameters:
table - the table to add to this table

remove

public V remove(Object rowKey,
                Object columnKey)
Description copied from interface: Table
Removes the mapping, if any, associated with the given keys.

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

row

public Map<C,V> row(R rowKey)
Description copied from interface: Table
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

rowKeySet

public Set<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 Map<R,Map<C,V>> rowMap()
Description copied from interface: Table
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().

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

size

public int size()
Description copied from interface: Table
Returns the number of row key / column key / value mappings in the table.

Specified by:
size in interface Table<R,C,V>

values

public Collection<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

equals

public boolean equals(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:

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(), Hashtable

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 hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

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 JavaTM 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), Hashtable