WindowListState (Flink : 2.0-SNAPSHOT API)

java.lang.Object
- org.apache.flink.table.runtime.operators.window.tvf.state.WindowListState<W>

All Implemented Interfaces:

WindowState<W>
```
public final class WindowListState<W>
extends Object
implements WindowState<W>
```
A wrapper of ListState which is easier to update based on window namespace.

Constructor Summary

Constructors
Constructor Description

WindowListState(InternalListState<RowData,W,RowData> windowState)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(W window, RowData value)`	Updates the operator state accessible by `#get(W)` by adding the given value to the list of values.
`void`	`clear(W window)`	Removes the value mapped under current key and the given window.
`List<RowData>`	`get(W window)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - WindowListState
```
public WindowListState(InternalListState<RowData,W,RowData> 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 List<RowData> get(W window)
                  throws Exception
```
    Throws:
    
    Exception
  - add
```
public void add(W window,
                RowData value)
         throws Exception
```
    Updates the operator state accessible by #get(W) by adding the given value to the list of values. The next time #get(W) is called (for the same state partition) the returned state will represent the updated list.
    If null is passed in, the state value will remain unchanged.
    
    Parameters:
    
    window - The namespace for the state.
    
    value - The new value for the state.
    
    Throws:
    
    Exception - Thrown if the system cannot access the state.