ForwardNode

java.lang.Object

edu.uky.ai.planning.ss.ForwardNode

All Implemented Interfaces:: StateSpaceNode

Direct Known Subclasses:: ForwardRoot

public class ForwardNode extends Object implements StateSpaceNode

Represents a node in a forward state space search graph, where a node is a state and the plan taken to reach that state from the initial state.

Author:: Stephen G. Ware

Field Summary

Fields

Modifier and Type

Field

Description

final ForwardNode

parent

This node's parent node (i.e.

final ForwardPlan

plan

The plan taken to reach this state

final State

state

The current state
Method Summary

Modifier and Type

Method

Description

ForwardNode

expand(Step step, State state)

Expands the child node that would be generated by taking this step.

Plan

getPlan()

Returns the plan this node represents.

final ForwardRoot

getRoot()

Returns the root node of the search space.

String

toString()

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

Field Details
- plan
  
  public final ForwardPlan plan
  
  The plan taken to reach this state
- state
  
  public final State state
  
  The current state
- parent
  
  public final ForwardNode parent
  
  This node's parent node (i.e. the state before the last step)
Method Details
- toString
  
  public String toString()
  
  Overrides:
  
  toString in class Object
- getPlan
  
  public Plan getPlan()
  
  Description copied from interface: StateSpaceNode
  
  Returns the plan this node represents.
  
  Specified by:
  
  getPlan in interface StateSpaceNode
  
  Returns:
  
  the plan
- getRoot
  
  public final ForwardRoot getRoot()
  
  Description copied from interface: StateSpaceNode
  
  Returns the root node of the search space.
  
  Specified by:
  
  getRoot in interface StateSpaceNode
  
  Returns:
  
  the root
- expand
  
  public ForwardNode expand(Step step, State state)
  
  Expands the child node that would be generated by taking this step. If the parent has not yet been visited, the parent is marked as visited.
  
  Parameters:
  
  step - the step which results in the child state
  
  state - the child state
  
  Returns:
  
  a node for the resulting state