Package de.aristaflow.adept2.model.common.changetracking

Class ChangeTrackingMap<T extends Serializable>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<T,ChangeType>

de.aristaflow.adept2.model.common.changetracking.ChangeTrackingMap<T>

Type Parameters:

T - The type of the property values that are changed.

All Implemented Interfaces:

Serializable, Cloneable, Map<T,ChangeType>

public class ChangeTrackingMap<T extends Serializable>
extends HashMap<T,ChangeType>

This map extends a normal HashMap by the means to track and combine changes for property values. Depending on the type of property value (and therefore the used ChangeCombiner), several changes of the same property value are combined to form one change.

Author:

Ulrich Kreher

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields

Modifier and Type	Field	Description
protected final ChangeCombiner	changeCombiner	The change combiner used for combining several changes to a property value.

Constructor Summary

Constructors

Constructor	Description
ChangeTrackingMap(ChangeCombiner changeCombiner)	Creates a new ChangeTrackingMap with the designated change combiner.
ChangeTrackingMap(ChangeCombiner changeCombiner, int initialCapacity)	Creates a new ChangeTrackingMap with the designated change combiner and the designated initial capacity.
ChangeTrackingMap(ChangeCombiner changeCombiner, Map<? extends T,ChangeType> m)	Creates a new ChangeTrackingMap with the designated change combiner containing the content of the designated map.

Method Summary

Modifier and Type	Method	Description
ChangeType	change(T propertyValue, ChangeType changeType)	Tracks a change of the designated type for the designated property value and combines the change with an existing one.

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Field Details

changeCombiner

protected final ChangeCombiner changeCombiner

The change combiner used for combining several changes to a property value.

Constructor Details

ChangeTrackingMap

public ChangeTrackingMap(ChangeCombiner changeCombiner)

Creates a new ChangeTrackingMap with the designated change combiner.

Parameters:

changeCombiner - The change combiner used for combining several changes to a property value.

ChangeTrackingMap

public ChangeTrackingMap(ChangeCombiner changeCombiner,
 int initialCapacity)

Creates a new ChangeTrackingMap with the designated change combiner and the designated initial capacity.

Parameters:

changeCombiner - The change combiner used for combining several changes to a property value.

initialCapacity - The initial capacity for the HashMap.

ChangeTrackingMap

public ChangeTrackingMap(ChangeCombiner changeCombiner,
 Map<? extends T,ChangeType> m)

Creates a new ChangeTrackingMap with the designated change combiner containing the content of the designated map.

Parameters:

changeCombiner - The change combiner used for combining several changes to a property value.

m - The map of which the mappings are to be placed in this map.

Method Details

change

public ChangeType change(T propertyValue,
 ChangeType changeType)

Tracks a change of the designated type for the designated property value and combines the change with an existing one.

Parameters:

propertyValue - The value of the property that has changed.

changeType - The type of the change of the property.

Returns:

The change type as combination of the previous and the current change.