com.google.common.graph

Interface MutableValueGraph<N,V>

Type Parameters:

N - Node parameter type

V - Value parameter type

All Superinterfaces:

ValueGraph<N,V>

@Beta
public interface MutableValueGraph<N,V>
extends ValueGraph<N,V>

A subinterface of ValueGraph which adds mutation methods. When mutation is not required, users should prefer the ValueGraph interface.

Since:

20.0

Author:

James Sexton

Method Summary

Modifier and Type	Method and Description
boolean	addNode(N node) Adds node if it is not already present.
V	putEdgeValue(N nodeU, N nodeV, V value) Adds an edge connecting nodeU to nodeV if one is not already present; associate that edge with value.
V	removeEdge(N nodeU, N nodeV) Removes the edge connecting nodeU to nodeV, if it is present.
boolean	removeNode(N node) Removes node if it is present; all edges incident to node will also be removed.

Methods inherited from interface com.google.common.graph.ValueGraph

adjacentNodes, allowsSelfLoops, asGraph, degree, edges, edgeValue, edgeValueOrDefault, equals, hasEdgeConnecting, hashCode, inDegree, isDirected, nodeOrder, nodes, outDegree, predecessors, successors

Method Detail

addNode

boolean addNode(N node)

Adds node if it is not already present.

Nodes must be unique, just as Map keys must be. They must also be non-null.

Returns:

true if the graph was modified as a result of this call

putEdgeValue

V putEdgeValue(N nodeU,
               N nodeV,
               V value)

Adds an edge connecting nodeU to nodeV if one is not already present; associate that edge with value. In an undirected graph, the edge will also connect nodeV to nodeU.

Values do not have to be unique. However, values must be non-null.

Behavior if nodeU and nodeV are not already present in this graph is implementation-dependent. Suggested behaviors include (a) silently adding nodeU and nodeV to the graph (this is the behavior of the default implementations) or (b) throwing IllegalArgumentException.

Returns:

the value previously associated with the edge connecting nodeU to nodeV, or null if there was no such edge.

Throws:

IllegalArgumentException - if the introduction of the edge would violate ValueGraph.allowsSelfLoops()

removeNode

boolean removeNode(N node)

Removes node if it is present; all edges incident to node will also be removed.

Returns:

true if the graph was modified as a result of this call

removeEdge

V removeEdge(N nodeU,
             N nodeV)

Removes the edge connecting nodeU to nodeV, if it is present.

Returns:

the value previously associated with the edge connecting nodeU to nodeV, or null if there was no such edge.