Module org.jgrapht.guava

Package org.jgrapht.graph.guava

Class MutableDoubleValueGraphAdapter<V>

java.lang.Object

org.jgrapht.graph.AbstractGraph<V,com.google.common.graph.EndpointPair<V>>

org.jgrapht.graph.guava.BaseValueGraphAdapter<V,W,com.google.common.graph.MutableValueGraph<V,W>>

org.jgrapht.graph.guava.MutableValueGraphAdapter<V,Double>

org.jgrapht.graph.guava.MutableDoubleValueGraphAdapter<V>

Type Parameters:

V - the graph vertex type

All Implemented Interfaces:

Serializable, Cloneable, Graph<V,com.google.common.graph.EndpointPair<V>>

public class MutableDoubleValueGraphAdapter<V>
extends MutableValueGraphAdapter<V,Double>

A graph adapter class using Guava's MutableValueGraph specialized with double values.

The adapter uses class EndpointPair to represent edges. Changes in the adapter such as adding or removing vertices and edges are reflected in the underlying value graph.

Each edge in MutableValueGraph is associated with a double value which is mapped to the edge weight in the resulting Graph. Thus, the graph is weighted and calling methods Graph.getEdgeWeight(Object) and setEdgeWeight(EndpointPair, double) will get and set the value of an edge.

See the example below on how to create such an adapter:

 MutableValueGraph<String, Double> mutableValueGraph =
     ValueGraphBuilder.directed().allowsSelfLoops(true).build();
 
 mutableValueGraph.addNode("v1");
 mutableValueGraph.addNode("v2");
 mutableValueGraph.putEdgeValue("v1", "v2", 3.0);
 
 Graph<String, EndpointPair<String>> graph = new MutableDoubleValueGraphAdapter<>(mutableValueGraph);
 
 System.out.println(graph.getEdgeWeight(EndpointPair.ordered("v1", "v2")); // outputs 3.0
 
 graph.setEdgeWeight(EndpointPair.ordered("v1", "v2"), 7.0);
 
 System.out.println(graph.getEdgeWeight(EndpointPair.ordered("v1", "v2")); // outputs 7.0
 

Author:

Dimitrios Michail

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.jgrapht.graph.guava.MutableValueGraphAdapter

defaultValue

Fields inherited from class org.jgrapht.graph.guava.BaseValueGraphAdapter

edgeSupplier, LOOPS_NOT_ALLOWED, unmodifiableEdgeSet, unmodifiableVertexSet, valueConverter, valueGraph, vertexOrder, vertexOrderMethod, vertexSupplier

Fields inherited from interface org.jgrapht.Graph

DEFAULT_EDGE_WEIGHT

Constructor Summary

Constructors

Constructor	Description
MutableDoubleValueGraphAdapter(com.google.common.graph.MutableValueGraph<V,Double> valueGraph)	Create a new adapter.
MutableDoubleValueGraphAdapter(com.google.common.graph.MutableValueGraph<V,Double> valueGraph, Supplier<V> vertexSupplier, Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier)	Create a new adapter.

Method Summary

Modifier and Type	Method	Description
void	setEdgeWeight(com.google.common.graph.EndpointPair<V> e, double weight)	Assigns a weight to an edge.

Methods inherited from class org.jgrapht.graph.guava.MutableValueGraphAdapter

addEdge, addEdge, addVertex, addVertex, clone, removeEdge, removeEdge, removeVertex

Methods inherited from class org.jgrapht.graph.guava.BaseValueGraphAdapter

containsEdge, containsVertex, createVertexOrder, degreeOf, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeSource, getEdgeSupplier, getEdgeTarget, getEdgeWeight, getType, getVertexSupplier, incomingEdgesOf, inDegreeOf, outDegreeOf, outgoingEdgesOf, setEdgeSupplier, setVertexSupplier, vertexSet

Methods inherited from class org.jgrapht.graph.AbstractGraph

assertVertexExist, containsEdge, equals, hashCode, removeAllEdges, removeAllEdges, removeAllEdges, removeAllVertices, toString, toStringFromSets

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.jgrapht.Graph

containsEdge, containsEdge, containsVertex, degreeOf, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeSource, getEdgeSupplier, getEdgeTarget, getEdgeWeight, getType, getVertexSupplier, incomingEdgesOf, inDegreeOf, iterables, outDegreeOf, outgoingEdgesOf, removeAllEdges, removeAllEdges, removeAllVertices, setEdgeWeight, vertexSet

Constructor Details

MutableDoubleValueGraphAdapter

public MutableDoubleValueGraphAdapter(com.google.common.graph.MutableValueGraph<V,Double> valueGraph)

Create a new adapter.

Parameters:

valueGraph - the value graph

MutableDoubleValueGraphAdapter

public MutableDoubleValueGraphAdapter(com.google.common.graph.MutableValueGraph<V,Double> valueGraph,
 Supplier<V> vertexSupplier,
 Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier)

Create a new adapter.

Parameters:

valueGraph - the value graph

vertexSupplier - the vertex supplier

edgeSupplier - the edge supplier

Method Details

setEdgeWeight

public void setEdgeWeight(com.google.common.graph.EndpointPair<V> e,
 double weight)

Description copied from class: MutableValueGraphAdapter

Assigns a weight to an edge. This method always throws an UnsupportedOperationException since the adapter works one-way from values to weights. Adjusting the weights can be done by adjusting the values in the underlying ValueGraph which will automatically be propagated using the provided converter.

Specified by:

setEdgeWeight in interface Graph<V,com.google.common.graph.EndpointPair<V>>

Overrides:

setEdgeWeight in class MutableValueGraphAdapter<V,Double>

Parameters:

e - edge on which to set weight

weight - new weight for edge