org.jgrapht.graph
Class GraphUnion<V,E,G extends Graph<V,E>>

java.lang.Object
  extended by org.jgrapht.graph.AbstractGraph<V,E>
      extended by org.jgrapht.graph.GraphUnion<V,E,G>
All Implemented Interfaces:
java.io.Serializable, Graph<V,E>
Direct Known Subclasses:
DirectedGraphUnion, UndirectedGraphUnion

public class GraphUnion<V,E,G extends Graph<V,E>>
extends AbstractGraph<V,E>
implements java.io.Serializable

Read-only union of two graphs: G1 and G2. If G1 = (V1, E1) and G2 = (V2, E2) then their union G = (V, E), where V is the union of V1 and V2, and E is the union of E1 and E1.

GraphUnion implements Graph interface. GraphUnion uses WeightCombiner to choose policy for calculating edge weight.

See Also:
Serialized Form

Constructor Summary
GraphUnion(G g1, G g2)
           
GraphUnion(G g1, G g2, WeightCombiner operator)
           
 
Method Summary
 E addEdge(V sourceVertex, V targetVertex)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 boolean addEdge(V sourceVertex, V targetVertex, E e)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 boolean addVertex(V v)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 boolean containsEdge(E e)
          Returns true if this graph contains the specified edge.
 boolean containsVertex(V v)
          Returns true if this graph contains the specified vertex.
 java.util.Set<E> edgeSet()
          Returns a set of the edges contained in this graph.
 java.util.Set<E> edgesOf(V vertex)
          Returns a set of all edges touching the specified vertex.
 java.util.Set<E> getAllEdges(V sourceVertex, V targetVertex)
          Returns a set of all edges connecting source vertex to target vertex if such vertices exist in this graph.
 E getEdge(V sourceVertex, V targetVertex)
          Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph.
 EdgeFactory<V,E> getEdgeFactory()
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 V getEdgeSource(E e)
          Returns the source vertex of an edge.
 V getEdgeTarget(E e)
          Returns the target vertex of an edge.
 double getEdgeWeight(E e)
          Returns the weight assigned to a given edge.
 G getG1()
           
 G getG2()
           
 boolean removeEdge(E e)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 E removeEdge(V sourceVertex, V targetVertex)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 boolean removeVertex(V v)
          Throws UnsupportedOperationException, because GraphUnion is read-only.
 java.util.Set<V> vertexSet()
          Returns a set of the vertices contained in this graph.
 
Methods inherited from class org.jgrapht.graph.AbstractGraph
assertVertexExist, containsEdge, removeAllEdges, removeAllEdges, removeAllEdges, removeAllVertices, toString, toStringFromSets
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

GraphUnion

public GraphUnion(G g1,
                  G g2,
                  WeightCombiner operator)

GraphUnion

public GraphUnion(G g1,
                  G g2)
Method Detail

getAllEdges

public java.util.Set<E> 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,E>
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.

getEdge

public E 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,E>
Parameters:
sourceVertex - source vertex of the edge.
targetVertex - target vertex of the edge.
Returns:
an edge connecting source vertex to target vertex.

getEdgeFactory

public EdgeFactory<V,E> getEdgeFactory()
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
getEdgeFactory in interface Graph<V,E>
Returns:
the edge factory using which this graph creates new edges.

addEdge

public E addEdge(V sourceVertex,
                 V targetVertex)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
addEdge in interface Graph<V,E>
Parameters:
sourceVertex - source vertex of the edge.
targetVertex - target vertex of the edge.
Returns:
The newly created edge if added to the graph, otherwise null.
See Also:
Graph.getEdgeFactory()

addEdge

public boolean addEdge(V sourceVertex,
                       V targetVertex,
                       E e)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
addEdge in interface Graph<V,E>
Parameters:
sourceVertex - source vertex of the edge.
targetVertex - target vertex of the edge.
e - edge to be added to this graph.
Returns:
true if this graph did not already contain the specified edge.
See Also:
Graph.addEdge(Object, Object), Graph.getEdgeFactory()

addVertex

public boolean addVertex(V v)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
addVertex in interface Graph<V,E>
Parameters:
v - vertex to be added to this graph.
Returns:
true if this graph did not already contain the specified vertex.

containsEdge

public boolean containsEdge(E 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,E>
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,E>
Parameters:
v - vertex whose presence in this graph is to be tested.
Returns:
true if this graph contains the specified vertex.

edgeSet

public java.util.Set<E> 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,E>
Returns:
a set of the edges contained in this graph.

edgesOf

public java.util.Set<E> 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,E>
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.

removeEdge

public E removeEdge(V sourceVertex,
                    V targetVertex)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
removeEdge in interface Graph<V,E>
Parameters:
sourceVertex - source vertex of the edge.
targetVertex - target vertex of the edge.
Returns:
The removed edge, or null if no edge removed.

removeEdge

public boolean removeEdge(E e)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
removeEdge in interface Graph<V,E>
Parameters:
e - edge to be removed from this graph, if present.
Returns:
true if and only if the graph contained the specified edge.

removeVertex

public boolean removeVertex(V v)
Throws UnsupportedOperationException, because GraphUnion is read-only.

Specified by:
removeVertex in interface Graph<V,E>
Parameters:
v - vertex to be removed from this graph, if present.
Returns:
true if the graph contained the specified vertex; false otherwise.

vertexSet

public java.util.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,E>
Returns:
a set view of the vertices contained in this graph.

getEdgeSource

public V getEdgeSource(E 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,E>
Parameters:
e - edge of interest
Returns:
source vertex

getEdgeTarget

public V getEdgeTarget(E 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,E>
Parameters:
e - edge of interest
Returns:
target vertex

getEdgeWeight

public double getEdgeWeight(E e)
Description copied from interface: Graph
Returns the weight assigned to a given edge. Unweighted graphs return 1.0 (as defined by WeightedGraph.DEFAULT_EDGE_WEIGHT), allowing weighted-graph algorithms to apply to them where meaningful.

Specified by:
getEdgeWeight in interface Graph<V,E>
Parameters:
e - edge of interest
Returns:
edge weight
See Also:
WeightedGraph

getG1

public G getG1()
Returns:
G1

getG2

public G getG2()
Returns:
G2