org.apache.flink.table.runtime.operators.window.state

Class WindowMapState<W,UV>

java.lang.Object

org.apache.flink.table.runtime.operators.window.state.WindowMapState<W,UV>

All Implemented Interfaces:

WindowState<W>

public final class WindowMapState<W,UV>
extends Object
implements WindowState<W>

A wrapper of MapState which is easier to update based on window namespace.

Constructor Summary

Constructors

Constructor and Description
WindowMapState(InternalMapState<RowData,W,RowData,UV> windowState)

Method Summary

Modifier and Type	Method and Description
void	clear(W window) Removes the value mapped under current key and the given window.
boolean	contains(W window, RowData key) Returns whether there exists the given mapping.
Iterable<Map.Entry<RowData,UV>>	entries(W window) Returns all the mappings in the state.
UV	get(W window, RowData key) Returns the current value associated with the given key.
boolean	isEmpty(W window) Returns true if this state contains no key-value mappings, otherwise false.
Iterator<Map.Entry<RowData,UV>>	iterator(W window) Iterates over all the mappings in the state.
Iterable<RowData>	keys(W window) Returns all the keys in the state.
void	put(W window, RowData key, UV value) Associates a new value with the given key.
void	putAll(W window, Map<RowData,UV> map) Copies all of the mappings from the given map into the state.
void	remove(W window, RowData key) Deletes the mapping of the given key.
Iterable<UV>	values(W window) Returns all the values in the state.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WindowMapState

public WindowMapState(InternalMapState<RowData,W,RowData,UV> windowState)

Method Detail

clear

public void clear(W window)

Description copied from interface: WindowState

Removes the value mapped under current key and the given window.

Specified by:

clear in interface WindowState<W>

get

public UV get(W window,
              RowData key)
       throws Exception

Returns the current value associated with the given key.

Parameters:

key - The key of the mapping

Returns:

The value of the mapping with the given key

Throws:

Exception - Thrown if the system cannot access the state.

put

public void put(W window,
                RowData key,
                UV value)
         throws Exception

Associates a new value with the given key.

Parameters:

key - The key of the mapping

value - The new value of the mapping

Throws:

Exception - Thrown if the system cannot access the state.

putAll

public void putAll(W window,
                   Map<RowData,UV> map)
            throws Exception

Copies all of the mappings from the given map into the state.

Parameters:

map - The mappings to be stored in this state

Throws:

Exception - Thrown if the system cannot access the state.

remove

public void remove(W window,
                   RowData key)
            throws Exception

Deletes the mapping of the given key.

Parameters:

key - The key of the mapping

Throws:

Exception - Thrown if the system cannot access the state.

contains

public boolean contains(W window,
                        RowData key)
                 throws Exception

Returns whether there exists the given mapping.

Parameters:

key - The key of the mapping

Returns:

True if there exists a mapping whose key equals to the given key

Throws:

Exception - Thrown if the system cannot access the state.

entries

public Iterable<Map.Entry<RowData,UV>> entries(W window)
                                        throws Exception

Returns all the mappings in the state.

Returns:

An iterable view of all the key-value pairs in the state.

Throws:

Exception - Thrown if the system cannot access the state.

keys

public Iterable<RowData> keys(W window)
                       throws Exception

Returns all the keys in the state.

Returns:

An iterable view of all the keys in the state.

Throws:

Exception - Thrown if the system cannot access the state.

values

public Iterable<UV> values(W window)
                    throws Exception

Returns all the values in the state.

Returns:

An iterable view of all the values in the state.

Throws:

Exception - Thrown if the system cannot access the state.

iterator

public Iterator<Map.Entry<RowData,UV>> iterator(W window)
                                         throws Exception

Iterates over all the mappings in the state.

Returns:

An iterator over all the mappings in the state

Throws:

Exception - Thrown if the system cannot access the state.

isEmpty

public boolean isEmpty(W window)
                throws Exception

Returns true if this state contains no key-value mappings, otherwise false.

Returns:

True if this state contains no key-value mappings, otherwise false.

Throws:

Exception - Thrown if the system cannot access the state.