org.jgrapht.graph.guava

Class BaseGraphAdapter<V,G extends com.google.common.graph.Graph<V>>

java.lang.Object

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

org.jgrapht.graph.guava.BaseGraphAdapter<V,G>

Type Parameters:

V - the graph vertex type

G - type of the underlying Guava's graph

All Implemented Interfaces:

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

Direct Known Subclasses:

ImmutableGraphAdapter, MutableGraphAdapter

public abstract class BaseGraphAdapter<V,G extends com.google.common.graph.Graph<V>>
extends AbstractGraph<V,com.google.common.graph.EndpointPair<V>>
implements Graph<V,com.google.common.graph.EndpointPair<V>>, Cloneable, Serializable

A base abstract implementation for the graph adapter class using Guava's Graph. This is a helper class in order to support both mutable and immutable graphs.

Author:

Dimitrios Michail

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Supplier<com.google.common.graph.EndpointPair<V>>	edgeSupplier
protected G	graph
protected static String	LOOPS_NOT_ALLOWED
protected Set<com.google.common.graph.EndpointPair<V>>	unmodifiableEdgeSet
protected Set<V>	unmodifiableVertexSet
protected Supplier<V>	vertexSupplier

Fields inherited from interface org.jgrapht.Graph

DEFAULT_EDGE_WEIGHT

Constructor Summary

Constructors

Constructor and Description
BaseGraphAdapter(G graph) Create a new adapter.
BaseGraphAdapter(G graph, Supplier<V> vertexSupplier, Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier) Create a new adapter.

Method Summary

Modifier and Type	Method and Description
boolean	containsEdge(com.google.common.graph.EndpointPair<V> e) Returns true if this graph contains the specified edge.
boolean	containsVertex(V v) Returns true if this graph contains the specified vertex.
int	degreeOf(V vertex) Returns the degree of the specified vertex.
Set<com.google.common.graph.EndpointPair<V>>	edgeSet() Returns a set of the edges contained in this graph.
Set<com.google.common.graph.EndpointPair<V>>	edgesOf(V vertex) Returns a set of all edges touching the specified vertex.
Set<com.google.common.graph.EndpointPair<V>>	getAllEdges(V sourceVertex, V targetVertex) Returns a set of all edges connecting source vertex to target vertex if such vertices exist in this graph.
com.google.common.graph.EndpointPair<V>	getEdge(V sourceVertex, V targetVertex) Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph.
V	getEdgeSource(com.google.common.graph.EndpointPair<V> e) Returns the source vertex of an edge.
Supplier<com.google.common.graph.EndpointPair<V>>	getEdgeSupplier() Return the edge supplier that the graph uses whenever it needs to create new edges.
V	getEdgeTarget(com.google.common.graph.EndpointPair<V> e) Returns the target vertex of an edge.
double	getEdgeWeight(com.google.common.graph.EndpointPair<V> e) Returns the weight assigned to a given edge.
GraphType	getType() Get the graph type.
Supplier<V>	getVertexSupplier() Return the vertex supplier that the graph uses whenever it needs to create new vertices.
Set<com.google.common.graph.EndpointPair<V>>	incomingEdgesOf(V vertex) Returns a set of all edges incoming into the specified vertex.
int	inDegreeOf(V vertex) Returns the "in degree" of the specified vertex.
int	outDegreeOf(V vertex) Returns the "out degree" of the specified vertex.
Set<com.google.common.graph.EndpointPair<V>>	outgoingEdgesOf(V vertex) Returns a set of all edges outgoing from the specified vertex.
void	setEdgeSupplier(Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier) Set the edge supplier that the graph uses whenever it needs to create new edges.
void	setVertexSupplier(Supplier<V> vertexSupplier) Set the vertex supplier that the graph uses whenever it needs to create new vertices.
Set<V>	vertexSet() Returns a set of the vertices contained in this graph.

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

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

Methods inherited from interface org.jgrapht.Graph

addEdge, addEdge, addVertex, addVertex, containsEdge, removeAllEdges, removeAllEdges, removeAllVertices, removeEdge, removeEdge, removeVertex, setEdgeWeight, setEdgeWeight

Field Detail

LOOPS_NOT_ALLOWED

protected static final String LOOPS_NOT_ALLOWED

See Also:

Constant Field Values

unmodifiableVertexSet

protected transient Set<V> unmodifiableVertexSet

unmodifiableEdgeSet

protected transient Set<com.google.common.graph.EndpointPair<V>> unmodifiableEdgeSet

vertexSupplier

protected Supplier<V> vertexSupplier

edgeSupplier

protected Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier

graph

protected transient G extends com.google.common.graph.Graph<V> graph

Constructor Detail

BaseGraphAdapter

public BaseGraphAdapter(G graph)

Create a new adapter.

Parameters:

graph - the graph

BaseGraphAdapter

public BaseGraphAdapter(G graph,
                        Supplier<V> vertexSupplier,
                        Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier)

Create a new adapter.

Parameters:

graph - the graph

vertexSupplier - the vertex supplier

edgeSupplier - the edge supplier

Method Detail

getVertexSupplier

public Supplier<V> getVertexSupplier()

Description copied from interface: Graph

Return the vertex supplier that the graph uses whenever it needs to create new vertices.

A graph uses the vertex supplier to create new vertex objects whenever a user calls method Graph.addVertex(). Users can also create the vertex in user code and then use method Graph.addVertex(Object) to add the vertex.

In contrast with the Supplier interface, the vertex supplier has the additional requirement that a new and distinct result is returned every time it is invoked. More specifically for a new vertex to be added in a graph v must not be equal to any other vertex in the graph. More formally, the graph must not contain any vertex v2 such that v2.equals(v).

Care must also be taken when interchanging calls to methods Graph.addVertex(Object) and Graph.addVertex(). In such a case the user must make sure never to add vertices in the graph using method Graph.addVertex(Object), which are going to be returned in the future by the supplied vertex supplier. Such a sequence will result into an IllegalArgumentException when calling method Graph.addVertex().

Specified by:

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

Returns:

the vertex supplier or null if the graph has no such supplier

setVertexSupplier

public void setVertexSupplier(Supplier<V> vertexSupplier)

Set the vertex supplier that the graph uses whenever it needs to create new vertices.

A graph uses the vertex supplier to create new vertex objects whenever a user calls method Graph.addVertex(). Users can also create the vertex in user code and then use method Graph.addVertex(Object) to add the vertex.

In contrast with the Supplier interface, the vertex supplier has the additional requirement that a new and distinct result is returned every time it is invoked. More specifically for a new vertex to be added in a graph v must not be equal to any other vertex in the graph. More formally, the graph must not contain any vertex v2 such that v2.equals(v).

Parameters:

vertexSupplier - the vertex supplier

getEdgeSupplier

public Supplier<com.google.common.graph.EndpointPair<V>> getEdgeSupplier()

Description copied from interface: Graph

Return the edge supplier that the graph uses whenever it needs to create new edges.

A graph uses the edge supplier to create new edge objects whenever a user calls method Graph.addEdge(Object, Object). Users can also create the edge in user code and then use method Graph.addEdge(Object, Object, Object) to add the edge.

In contrast with the Supplier interface, the edge supplier has the additional requirement that a new and distinct result is returned every time it is invoked. More specifically for a new edge to be added in a graph e must not be equal to any other edge in the graph (even if the graph allows edge-multiplicity). More formally, the graph must not contain any edge e2 such that e2.equals(e).

Specified by:

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

Returns:

the edge supplier null if the graph has no such supplier

setEdgeSupplier

public void setEdgeSupplier(Supplier<com.google.common.graph.EndpointPair<V>> edgeSupplier)

Set the edge supplier that the graph uses whenever it needs to create new edges.

A graph uses the edge supplier to create new edge objects whenever a user calls method Graph.addEdge(Object, Object). Users can also create the edge in user code and then use method Graph.addEdge(Object, Object, Object) to add the edge.

In contrast with the Supplier interface, the edge supplier has the additional requirement that a new and distinct result is returned every time it is invoked. More specifically for a new edge to be added in a graph e must not be equal to any other edge in the graph (even if the graph allows edge-multiplicity). More formally, the graph must not contain any edge e2 such that e2.equals(e).

Parameters:

edgeSupplier - the edge supplier

getEdge

public com.google.common.graph.EndpointPair<V> getEdge(V sourceVertex,
                                                       V targetVertex)

Description copied from interface: Graph

Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph. Otherwise returns null. If any of the specified vertices is null returns null

In undirected graphs, the returned edge may have its source and target vertices in the opposite order.

Specified by:

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

Parameters:

sourceVertex - source vertex of the edge.

targetVertex - target vertex of the edge.

Returns:

an edge connecting source vertex to target vertex.

vertexSet

public Set<V> vertexSet()

Description copied from interface: Graph

Returns a set of the vertices contained in this graph. The set is backed by the graph, so changes to the graph are reflected in the set. If the graph is modified while an iteration over the set is in progress, the results of the iteration are undefined.

The graph implementation may maintain a particular set ordering (e.g. via LinkedHashSet) for deterministic iteration, but this is not required. It is the responsibility of callers who rely on this behavior to only use graph implementations which support it.

Specified by:

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

Returns:

a set view of the vertices contained in this graph.

getEdgeSource

public V getEdgeSource(com.google.common.graph.EndpointPair<V> e)

Description copied from interface: Graph

Returns the source vertex of an edge. For an undirected graph, source and target are distinguishable designations (but without any mathematical meaning).

Specified by:

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

Parameters:

e - edge of interest

Returns:

source vertex

getEdgeTarget

public V getEdgeTarget(com.google.common.graph.EndpointPair<V> e)

Description copied from interface: Graph

Returns the target vertex of an edge. For an undirected graph, source and target are distinguishable designations (but without any mathematical meaning).

Specified by:

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

Parameters:

e - edge of interest

Returns:

target vertex

getType

public GraphType getType()

Description copied from interface: Graph

Get the graph type. The graph type can be used to query for additional metadata such as whether the graph supports directed or undirected edges, self-loops, multiple (parallel) edges, weights, etc.

Specified by:

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

Returns:

the graph type

containsEdge

public boolean containsEdge(com.google.common.graph.EndpointPair<V> e)

Description copied from interface: Graph

Returns true if this graph contains the specified edge. More formally, returns true if and only if this graph contains an edge e2 such that e.equals(e2). If the specified edge is null returns false.

Specified by:

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

Parameters:

e - edge whose presence in this graph is to be tested.

Returns:

true if this graph contains the specified edge.

containsVertex

public boolean containsVertex(V v)

Description copied from interface: Graph

Returns true if this graph contains the specified vertex. More formally, returns true if and only if this graph contains a vertex u such that u.equals(v). If the specified vertex is null returns false.

Specified by:

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

Parameters:

v - vertex whose presence in this graph is to be tested.

Returns:

true if this graph contains the specified vertex.

edgeSet

public Set<com.google.common.graph.EndpointPair<V>> edgeSet()

Description copied from interface: Graph

Returns a set of the edges contained in this graph. The set is backed by the graph, so changes to the graph are reflected in the set. If the graph is modified while an iteration over the set is in progress, the results of the iteration are undefined.

The graph implementation may maintain a particular set ordering (e.g. via LinkedHashSet) for deterministic iteration, but this is not required. It is the responsibility of callers who rely on this behavior to only use graph implementations which support it.

Specified by:

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

Returns:

a set of the edges contained in this graph.

degreeOf

public int degreeOf(V vertex)

Description copied from interface: Graph

Returns the degree of the specified vertex.

A degree of a vertex in an undirected graph is the number of edges touching that vertex. Edges with same source and target vertices (self-loops) are counted twice.

In directed graphs this method returns the sum of the "in degree" and the "out degree".

Specified by:

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

Parameters:

vertex - vertex whose degree is to be calculated.

Returns:

the degree of the specified vertex.

edgesOf

public Set<com.google.common.graph.EndpointPair<V>> edgesOf(V vertex)

Description copied from interface: Graph

Returns a set of all edges touching the specified vertex. If no edges are touching the specified vertex returns an empty set.

Specified by:

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

Parameters:

vertex - the vertex for which a set of touching edges is to be returned.

Returns:

a set of all edges touching the specified vertex.

inDegreeOf

public int inDegreeOf(V vertex)

Description copied from interface: Graph

Returns the "in degree" of the specified vertex.

The "in degree" of a vertex in a directed graph is the number of inward directed edges from that vertex. See http://mathworld.wolfram.com/Indegree.html.

In the case of undirected graphs this method returns the number of edges touching the vertex. Edges with same source and target vertices (self-loops) are counted twice.

Specified by:

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

Parameters:

vertex - vertex whose degree is to be calculated.

Returns:

the degree of the specified vertex.

incomingEdgesOf

public Set<com.google.common.graph.EndpointPair<V>> incomingEdgesOf(V vertex)

Description copied from interface: Graph

Returns a set of all edges incoming into the specified vertex.

In the case of undirected graphs this method returns all edges touching the vertex, thus, some of the returned edges may have their source and target vertices in the opposite order.

Specified by:

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

Parameters:

vertex - the vertex for which the list of incoming edges to be returned.

Returns:

a set of all edges incoming into the specified vertex.

outDegreeOf

public int outDegreeOf(V vertex)

Description copied from interface: Graph

Returns the "out degree" of the specified vertex.

The "out degree" of a vertex in a directed graph is the number of outward directed edges from that vertex. See http://mathworld.wolfram.com/Outdegree.html.

In the case of undirected graphs this method returns the number of edges touching the vertex. Edges with same source and target vertices (self-loops) are counted twice.

Specified by:

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

Parameters:

vertex - vertex whose degree is to be calculated.

Returns:

the degree of the specified vertex.

outgoingEdgesOf

public Set<com.google.common.graph.EndpointPair<V>> outgoingEdgesOf(V vertex)

Description copied from interface: Graph

Returns a set of all edges outgoing from the specified vertex.

In the case of undirected graphs this method returns all edges touching the vertex, thus, some of the returned edges may have their source and target vertices in the opposite order.

Specified by:

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

Parameters:

vertex - the vertex for which the list of outgoing edges to be returned.

Returns:

a set of all edges outgoing from the specified vertex.

getEdgeWeight

public double getEdgeWeight(com.google.common.graph.EndpointPair<V> e)

Description copied from interface: Graph

Returns the weight assigned to a given edge. Unweighted graphs return 1.0 (as defined by Graph.DEFAULT_EDGE_WEIGHT), allowing weighted-graph algorithms to apply to them when meaningful.

Specified by:

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

Parameters:

e - edge of interest

Returns:

edge weight

getAllEdges

public Set<com.google.common.graph.EndpointPair<V>> getAllEdges(V sourceVertex,
                                                                V targetVertex)

Description copied from interface: Graph

Returns a set of all edges connecting source vertex to target vertex if such vertices exist in this graph. If any of the vertices does not exist or is null, returns null. If both vertices exist but no edges found, returns an empty set.

In undirected graphs, some of the returned edges may have their source and target vertices in the opposite order. In simple graphs the returned set is either singleton set or empty set.

Specified by:

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

Parameters:

sourceVertex - source vertex of the edge.

targetVertex - target vertex of the edge.

Returns:

a set of all edges connecting source vertex to target vertex.