GraphTraversal (Geotools modules 21-SNAPSHOT API)

All Known Implementing Classes:: BasicGraphTraversal, StagedGraphTraversal

public interface GraphTraversal

Iterates a GraphWalker over the components of a Graph. The order in which components are iterated over is determined by the GraphIterator class. The GraphTraversal is the mediator between the GraphWalker and the GraphIterator.

Upon each visitation, the GraphWalker communicates to the GraphTraversal through a series of return codes, each specifying a different action to perform at that point of the travesal. The following summarizes the meaning of the codes.

Code	Action Taken
CONTINUE	The traversal continues as normal.
SUSPEND	Suspends the traversal at some intermediate stage. This code should be returned if the traversal is intended to be resumed.
KILL_BRANCH	Kills the current branch of the traversal. Depending on the iteration algorithm, returning this code may end the traversal.
STOP	Stops the traversal.

GraphTraversals are started with a call to traverse(). If the traversal is suspended at some intermediate point, an additional call to traverse() will resume the traversal.

Author:: Justin Deoliveira, Refractions Research Inc, jdeolive@refractions.net
See Also:: GraphWalker, GraphIterator, Graph

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CONTINUE` Signals the traversal to continue *
`static int`	`KILL_BRANCH` Signals the traversal to kill the current branch *
`static int`	`STOP` Signals the traversal to stop *
`static int`	`SUSPEND` Signals the traversal to suspend at some intermediate point *

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`Graph`	`getGraph()` Returns the graph being traversed.
`GraphIterator`	`getIterator()` Returns the iterator that specifies the order in which to visit graph components.
`GraphWalker`	`getWalker()` Returns the walker (visitor) traversing the graph of the graph.
`void`	`init()` Initializes the traversal.
`boolean`	`isVisited(Graphable g)`
`void`	`setGraph(Graph graph)` Sets the graph being traversed.
`void`	`setIterator(GraphIterator iterator)` Sets the iterator that specifies the order in which visit graph components.
`void`	`setVisited(Graphable g, boolean visited)`
`void`	`setWalker(GraphWalker walker)` Sets the walker (visitor) traversing the graph.
`void`	`traverse()` Starts or resumes a traversal over the components of a graph.

- Field Detail
  - CONTINUE
```
static final int CONTINUE
```
    Signals the traversal to continue *
    
    See Also:
    
    Constant Field Values
  - SUSPEND
```
static final int SUSPEND
```
    Signals the traversal to suspend at some intermediate point *
    
    See Also:
    
    Constant Field Values
  - KILL_BRANCH
```
static final int KILL_BRANCH
```
    Signals the traversal to kill the current branch *
    
    See Also:
    
    Constant Field Values
  - STOP
```
static final int STOP
```
    Signals the traversal to stop *
    
    See Also:
    
    Constant Field Values
- Method Detail
  - setGraph
```
void setGraph(Graph graph)
```
    Sets the graph being traversed.
    
    Parameters:
    
    graph - The graph whose components are being traversed.
  - getGraph
```
Graph getGraph()
```
    Returns the graph being traversed.
    
    Returns:
    
    The graph whose components are being traversed.
    
    See Also:
    
    Graph
  - setIterator
```
void setIterator(GraphIterator iterator)
```
    Sets the iterator that specifies the order in which visit graph components.
    
    Parameters:
    
    iterator - The iterator over the graph components.
  - getIterator
```
GraphIterator getIterator()
```
    Returns the iterator that specifies the order in which to visit graph components.
    
    Returns:
    
    The iterator over the graph components.
    
    See Also:
    
    GraphIterator
  - setWalker
```
void setWalker(GraphWalker walker)
```
    Sets the walker (visitor) traversing the graph.
    
    Parameters:
    
    walker - The walker being iterated over the components of the graph.
  - getWalker
```
GraphWalker getWalker()
```
    Returns the walker (visitor) traversing the graph of the graph.
    
    Returns:
    
    The walker being iterated over the components.
  - init
```
void init()
```
    Initializes the traversal.
  - traverse
```
void traverse()
```
    Starts or resumes a traversal over the components of a graph.
  - isVisited
```
boolean isVisited(Graphable g)
```
  - setVisited
```
void setVisited(Graphable g,
                boolean visited)
```

Interface GraphTraversal

Field Summary

Method Summary

Field Detail

CONTINUE

SUSPEND

KILL_BRANCH

STOP

Method Detail

setGraph

getGraph

setIterator

getIterator

setWalker

getWalker

init

traverse

isVisited

setVisited