Package com.google.javascript.jscomp.graph

Class GraphReachability<N,E>

java.lang.Object

com.google.javascript.jscomp.graph.GraphReachability<N,E>

Type Parameters:

N - The type of data that the graph node holds.

E - The type of data that the graph edge holds.

All Implemented Interfaces:

FixedPointGraphTraversal.EdgeCallback<N,E>

public final class GraphReachability<N,E>
extends java.lang.Object
implements FixedPointGraphTraversal.EdgeCallback<N,E>

Computes all the reachable nodes. Upon execution of compute(Object), the graph nodes will be annotated with REACHABLE if it is reachable from the specified entry node.

See Also:

Annotatable.getAnnotation()

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	GraphReachability.EdgeTuple<N,E>	Represents a Source Node and an Edge.

Field Summary

Fields

Modifier and Type	Field	Description
static Annotation	REACHABLE

Constructor Summary

Constructors

Constructor	Description
GraphReachability(DiGraph<N,E> graph)
GraphReachability(DiGraph<N,E> graph, @Nullable com.google.common.base.Predicate<GraphReachability.EdgeTuple<N,E>> edgePredicate)

Method Summary

Modifier and Type	Method	Description
void	compute(N entry)
void	recompute(N reachableNode)
boolean	traverseEdge(N source, E e, N destination)	Update the state of the destination node when the given edge is traversed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

REACHABLE

public static final Annotation REACHABLE

Constructor Detail

GraphReachability

public GraphReachability(DiGraph<N,E> graph)

GraphReachability

public GraphReachability(DiGraph<N,E> graph,
                         @Nullable com.google.common.base.Predicate<GraphReachability.EdgeTuple<N,E>> edgePredicate)

Parameters:

graph - The graph.

edgePredicate - Given the predecessor P of the a node S and the edge coming from P to S, this predicate should return true if S is reachable from P using the edge.

Method Detail

compute

public void compute(N entry)

recompute

public void recompute(N reachableNode)

traverseEdge

public boolean traverseEdge(N source,
                            E e,
                            N destination)

Description copied from interface: FixedPointGraphTraversal.EdgeCallback

Update the state of the destination node when the given edge is traversed.

Recall that depending on the direction of the traversal, source and destination may be swapped compared to the orientation of the edge in the graph. In either case, only the destination parameter may be mutated.

Specified by:

traverseEdge in interface FixedPointGraphTraversal.EdgeCallback<N,E>

Parameters:

source - The start node.

e - The edge.

destination - The end node.

Returns:

Whether the state of the destination node changed.