org.opentrafficsim.core.gtu

Class NestedCache<T>

java.lang.Object

org.opentrafficsim.core.gtu.NestedCache<T>

Type Parameters:

T - value type

public class NestedCache<T>
extends Object

Utility class to cache data based on a variable (between cache instances) number of keys of any type. This replaces nested Maps.

Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See OpenTrafficSim License.

Version:

$Revision$, $LastChangedDate$, by $Author$, initial version 20 apr. 2018

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Constructor Summary

Constructors

Constructor and Description
NestedCache(Class<?>... types) Constructor.

Method Summary

Modifier and Type	Method and Description
NestedCache<T>	getChild(Object key) Return branch for key.
Set<Object>	getKeys() Return set of key objects on this level.
T	getValue(Object key) Return value for key.
T	getValue(Supplier<T> supplier, Object... keys) Returns a value.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

NestedCache

public NestedCache(Class<?>... types)

Constructor.

Parameters:

types - Class<?>...; types

Method Detail

getValue

public T getValue(Supplier<T> supplier,
                  Object... keys)

Returns a value.

Parameters:

supplier - Supplier<T>; supplier of T for if it wasn't cached yet

keys - Object...; list of key objects

Returns:

T; value

getKeys

public Set<Object> getKeys()

Return set of key objects on this level.

Returns:

Set; set of key objects on this level

getChild

public NestedCache<T> getChild(Object key)
                        throws IllegalStateException

Return branch for key.

Parameters:

key - Object; key

Returns:

NestedCache; branch for key

Throws:

IllegalStateException - if this is not a branch level

getValue

public T getValue(Object key)
           throws IllegalStateException

Return value for key.

Parameters:

key - Object; key

Returns:

T; value for key

Throws:

IllegalStateException - if this is not a leaf level

toString

public String toString()

Overrides:

toString in class Object