public class AsWeightedGraph<V,E> extends GraphDelegator<V,E> implements Serializable, WeightedGraph<V,E>
A weighted view of the backing graph specified in the constructor. This graph allows modules to apply algorithms designed for weighted graphs to an unweighted graph by providing an explicit edge weight mapping. The implementation also allows for "masking" weights for a subset of the edges in an existing weighted graph.
Query operations on this graph "read through" to the backing graph. Vertex addition/removal and edge addition/removal are all supported (and immediately reflected in the backing graph). Setting an edge weight will pass the operation to the backing graph as well if the backing graph implements the WeightedGraph interface. Setting an edge weight will modify the weight map in order to maintain a consistent graph.
Note that edges returned by this graph's accessors are really just the edges of the underlying directed graph.
This graph does not pass the hashCode and equals operations through to the backing graph, but relies on Object's equals and hashCode methods. This graph will be serializable if the backing graph is serializable.
| Modifier and Type | Field and Description |
|---|---|
protected Map<E,Double> |
weightMap |
DEFAULT_EDGE_WEIGHT| Constructor and Description |
|---|
AsWeightedGraph(Graph<V,E> g,
Map<E,Double> weightMap)
Constructor for AsWeightedGraph.
|
| Modifier and Type | Method and Description |
|---|---|
double |
getEdgeWeight(E e)
Returns the weight assigned to a given edge.
|
void |
setEdgeWeight(E e,
double weight)
Assigns a weight to an edge.
|
addEdge, addEdge, addVertex, containsEdge, containsVertex, degreeOf, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeFactory, getEdgeSource, getEdgeTarget, incomingEdgesOf, inDegreeOf, outDegreeOf, outgoingEdgesOf, removeEdge, removeEdge, removeVertex, toString, vertexSetassertVertexExist, containsEdge, equals, hashCode, removeAllEdges, removeAllEdges, removeAllEdges, removeAllVertices, toStringFromSetsclone, finalize, getClass, notify, notifyAll, wait, wait, waitaddEdge, addEdge, addVertex, containsEdge, containsEdge, containsVertex, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeFactory, getEdgeSource, getEdgeTarget, removeAllEdges, removeAllEdges, removeAllVertices, removeEdge, removeEdge, removeVertex, vertexSetpublic AsWeightedGraph(Graph<V,E> g, Map<E,Double> weightMap)
g - the backing graph over which a weighted view is to be created.weightMap - A mapping of edges to weights. If an edge is not present
in the weight map, the edge weight for the underlying graph is returned.
Note that a live reference to this map is retained, so if the caller
changes the map after construction, the changes will affect the
AsWeightedGraph instance as well.public void setEdgeWeight(E e, double weight)
WeightedGraphsetEdgeWeight in interface WeightedGraph<V,E>setEdgeWeight in class GraphDelegator<V,E>e - edge on which to set weightweight - new weight for edgeWeightedGraph.setEdgeWeight(E, double)public double getEdgeWeight(E e)
GraphWeightedGraph.DEFAULT_EDGE_WEIGHT), allowing
weighted-graph algorithms to apply to them where meaningful.getEdgeWeight in interface Graph<V,E>getEdgeWeight in class GraphDelegator<V,E>e - edge of interestGraph.getEdgeWeight(E)Copyright © 2016. All rights reserved.