EmptyEnvironment
An AbstractEnvironment implementation that intentionally provides no spatial functionality.
This environment is meant as a placeholder or sentinel implementation in contexts where an it.unibo.alchemist.model.Environment instance is required, but node insertion, movement, neighborhood computation, and position construction must be disallowed.
Parameters
the Incarnation associated with this environment.
the number of spatial dimensions exposed by this environment.
Properties
The current position of this node, see currentPositionOf.
Return the Incarnation used to initialize the entities of this Environment, if it has been set.
Whether any of the terminators is satisfied.
The observable neighborhood of this node, see neighborhoodOf.
The current NetworkModel, which must be bound to this environment. Assigning a new model publishes the neighborhood it provides for every node in the environment.
Returns an Observable view of the number of Nodes currently in the Environment.
An ordered Observable view of all the Nodes that exist in current Environment.
The origin (all zeros) for each coordinate axis.
The observable position of this node, see positionOf.
The reactions registered with this host, in registration order; ObservableList.current is a snapshot.
Return the current Simulation, if present, or throws an IllegalStateException otherwise.
Return the current Simulation, if present, or null otherwise.
The (unit) extent for each coordinate axis.
Override this property if units measuring distance do not match with units used for coordinates. For instance, if your space is non-Euclidean, or if you are using polar coordinates. A notable example is using geographical latitude-longitude as y-x coordinates and meters as distance measure.
Functions
Registers reaction and notifies the running simulation when it was not already present. Fails if this is not the Reaction.host of reaction.
Add a terminator indicating whether the simulation should be considered finished. The simulation finishes as soon as any of the terminators is satisfied.
Adds to the simulation a predicate that determines whether a simulation should be terminated.
Calculates the shortest paths using the Floyd-Warshall algorithm calculating the Hop Distance between nodes.
Computes the diameter of all subnetworks in the environment. The diameter is the longest shortest path between any two nodes. Returns a Map mapping each node to the subnetwork it belongs to.
Computes the diameter of all subnetworks in the environment. The diameter is the longest shortest path between any two nodes, evaluated using the allShortestHopPaths method. Returns a Set containing the subnetworks.
Computes the diameter of all subnetworks in the environment. The diameter is the longest shortest path between any two nodes, evaluated using the allShortestHopPaths method. Returns a Set containing the subnetworks.
Retrieves node's current position.
The distance between this node and other, see distanceBetween.
The farthest position that node reaches moving straight from its current position towards desired: desired itself, unless the constraints of this environment, such as its bounds, its obstacles, or the bodies of the other nodes, stop node earlier. moveNodeTo moves nodes to this position.
Returns true the network is segmented, false otherwise.
Given the coordinates of the point, returns a Position compatible with this environment.
This environment cannot create positions.
This environment does not support node movement.
Given a node, this method returns an observable view of its neighborhood.
Returns the diameter of the network in environment units if it is not segmented, and NaN otherwise.
Given a position this method returns a list of all the surrounding nodes within the given range. Note that this method (depending on the implementation) might be not optimized.
Given a node this method returns a list of all the surrounding nodes within the given range. Note that this method (depending on the implementation) might be not optimized, and it's consequently much better to use Environment.neighborhoodOf and filter the neighborhood if you are sure that all the nodes within the range are connected to the center.
The nodes within range of this position, see nodesAround.
The nodes within range of this node, see nodesAround.
Allows accessing a Node in this Environment known its id. Depending on the implementation, this method may or may not be optimized (namely, id could run in constant or linear time with the number of nodes).
Observes the value of the Layer associated with molecule at the position of node. The observable emits when node moves to a position where the value differs, and when the layer changes the value at the current position of node. Its value is null while no layer is associated with molecule, and it emits when one is: observables created during setup follow layers associated later.
An Observable alternative to nodesAround.
Observes the nodes within range of this position, see observeNodesAround.
Observes the nodes within range of this node, see observeNodesAround.
Observe the position of a node.
Removes this node, see removeNode.
Unregisters this reaction from its host, see removeReaction.
Removes node. If node removal is unsupported, it does nothing.
Unregisters reaction and notifies the running simulation when it was actually present.
Returns the EnvironmentSubscriptionMonitor of this Environment.
A function that maps an Environment to its surrogate class (EnvironmentSurrogate). Use the toSuitablePositionSurrogate strategy for PositionSurrogate mapping.
A function that maps an Environment to its surrogate class (EnvironmentSurrogate).
Converts an Environment to a EnvironmentSurrogate.
A position with these coordinates, see makePosition.