JavaECS-Docs/docs/component/ComponentManager.md

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Component Array

In this Section
About
Implementation
Constructors
Methods
Fields
Examples
Notes

About

The ComponentArray class defines the a common structure that all component data is stored in.

Implementation

Associatively maps an entity to the index position of its component data.

See ComponentManager.java for the full implementation.

Constructors

Default constructor

public ComponentManager(){}

Methods

addComponentToEntity

protected void addComponentToEntity(Type componentType, Object componentData, int entity);

Adds the specified component to the provided entity. Returns true if successful, false if the component is already associated to the entity.

entityDestroyed

public void entityDestroyed(int entity);

Signals to the ComponentManager the entity was destroyed. All component data references should be removed.

getComponent

public Object getComponent(Type componentType, int entity);

Gets the component data associated with the entity, or null if it was not found.

• The result of this operation should be cast back to the specified Type

getComponentIndex

protected Integer getComponentIndex(Type type);

Gets the registration index of the provided component type. Returns the index, or -1 if the component isn't registered.

getComponentType

protected Type getComponentType(Integer index);

Gets the registration type of the provided component index. Returns the index, or null if the component isn't registered.

moveComponentData

protected void moveComponentData(int sourceEntity, int destinationEntity, Type component);

Moves a single component data from one entity to another. Returns true if the component was moved successfully, else false.

moveAllComponentData

protected void moveAllComponentData(int sourceEntity, int destinationEntity, BitSet sourceRegistrations);

Moves all component data from one entity to another.

registerComponent

protected boolean registerComponent(Type type);

Registers the component type. Returns true if successful, else false.

removeComponentFromEntity

public boolean removeComponentFromEntity(Type componentType, int entity);

Removes the specified component from the entity. Returns true if successful, else false.

Fields

componentArrays

private Map<Type, ComponentArray> componentArrays = new HashMap<>();

Maps the component Type to its ComponentArray

componentPosIndex

private Map<Type, Integer> componentPosIndex = new HashMap<>();

The mapped list of component types to the registration indices.

indexComponentType

private Map<Integer, Type> indexComponentType = new HashMap<>();

The mapped list of registration indices to component types.