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Summary: Nested | Field | Method | Constr | Detail: Nested | Field | Method | Constr |
public interface Graph
org._3pq.jgrapht.graph
provides a gallery of
abstract and concrete graph implementations.
This library works best when vertices represent arbitrary objects and edges
represent the relationships between them. Vertex and edge instances may be
shared by more than one graph.
Method Summary | |
boolean |
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boolean |
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Edge |
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boolean | |
boolean |
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boolean |
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boolean |
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boolean |
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Set |
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List |
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List |
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Edge |
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EdgeFactory |
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boolean |
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List |
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boolean |
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Edge |
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boolean |
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boolean |
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Set |
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public boolean addAllEdges(Collection edges)
Adds all of the specified edges to this graph. The behavior of this operation is undefined if the specified vertex collection is modified while the operation is in progress. This method will invoke theaddEdge(Edge)
method.
- Parameters:
edges
- the edges to be added to this graph.
- Returns:
- true if this graph changed as a result of the call
- See Also:
addVertex(Object)
public boolean addAllVertices(Collection vertices)
Adds all of the specified vertices to this graph. The behavior of this operation is undefined if the specified vertex collection is modified while the operation is in progress. This method will invoke theaddVertex(Object)
method.
- Parameters:
vertices
- the vertices to be added to this graph.
- Returns:
- true if this graph changed as a result of the call
- See Also:
addVertex(Object)
public Edge addEdge(Object sourceVertex, Object targetVertex)
Creates a new edge in this graph, going from the source vertex to the target vertex, and returns the created edge. Some graphs do not allow edge-multiplicity. In such cases, if the graph already contains an edge from the specified source to the specified target, than this method does not change the graph and returnsnull
. The source and target vertices must already be contained in this graph. If they are not found in graph IllegalArgumentException is thrown. This method creates the new edgee
using this graph'sEdgeFactory
. For the new edge to be addede
must not be equal to any other edge the graph (even if the graph allows edge-multiplicity). More formally, the graph must not contain any edgee2
such thate2.equals(e)
. If suche2
is found then the newly created edgee
is abandoned, the method leaves this graph unchanged returnsnull
.
- 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:
getEdgeFactory()
public boolean addEdge(Edge e)
Adds the specified edge to this graph. More formally, adds the specified edge,e
, to this graph if this graph contains no edgee2
such thate2.equals(e)
. If this graph already contains such edge, the call leaves this graph unchanged and returns false. If the edge was added to the graph, returnstrue
. Some graphs do not allow edge-multiplicity. In such cases, if the graph already contains an edge going frome.getSource()
vertex toe.getTarget()
vertex, than this method does not change the graph and returnsfalse
. The source and target vertices of the specified edge must already be in this graph. If this is not the case, IllegalArgumentException is thrown. The edge must also be assignment compatible with the class of the edges produced by the edge factory of this graph. If this is not the case ClassCastException is thrown.
- Parameters:
e
- edge to be added to this graph.
- Returns:
- true if this graph did not already contain the specified edge.
- See Also:
addEdge(Object,Object)
,getEdgeFactory()
,EdgeFactory
public boolean addVertex(Object v)
Adds the specified vertex to this graph if not already present. More formally, adds the specified vertex,v
, to this graph if this graph contains no vertexu
such thatu.equals(v)
. If this graph already contains such vertex, the call leaves this graph unchanged and returns false. In combination with the restriction on constructors, this ensures that graphs never contain duplicate vertices.
- Parameters:
v
- vertex to be added to this graph.
- Returns:
- true if this graph did not already contain the specified vertex.
public boolean containsEdge(Object sourceVertex, Object targetVertex)
Returns true if and only if this graph contains an edge going from the source vertex to the target vertex. In undirected graphs the same result is obtained when source and target are inverted. If any of the specified vertices does not exist in the graph, or if isnull
, returnsfalse
.
- Parameters:
sourceVertex
- source vertex of the edge.targetVertex
- target vertex of the edge.
- Returns:
- true if this graph contains the specified edge.
public boolean containsEdge(Edge e)
Returns true if this graph contains the specified edge. More formally, returns true if and only if this graph contains an edgee2
such thate.equals(e2)
. If the specified edge isnull
returnsfalse
.
- Parameters:
e
- edge whose presence in this graph is to be tested.
- Returns:
- true if this graph contains the specified edge.
public boolean containsVertex(Object v)
Returns true if this graph contains the specified vertex. More formally, returns true if and only if this graph contains a vertexu
such thatu.equals(v)
. If the specified vertex isnull
returnsfalse
.
- Parameters:
v
- vertex whose presence in this graph is to be tested.
- Returns:
- true if this graph contains the specified vertex.
public Set edgeSet()
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. viajava.util.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.
- Returns:
- a set of the edges contained in this graph.
public List edgesOf(Object vertex)
Returns a list of all edges touching the specified vertex. If no edges are touching the specified vertex returns an empty list.
- Parameters:
vertex
- the vertex for which a list of touching edges to be returned.
- Returns:
- a list of all edges touching the specified vertex.
public List getAllEdges(Object sourceVertex, Object targetVertex)
Returns a list 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 isnull
, returnsnull
. If both vertices exist but no edges found, returns an empty list. In undirected graphs, some of the returned edges may have their source and target vertices in the opposite order. In simple graphs the returned list is either singleton list or empty list.
- Parameters:
sourceVertex
- source vertex of the edge.targetVertex
- target vertex of the edge.
- Returns:
- a list of all edges connecting source vertex to target vertex.
public Edge getEdge(Object sourceVertex, Object targetVertex)
Returns an edge connecting source vertex to target vertex if such vertices and such edge exist in this graph. Otherwise returnsnull
. If any of the specified vertices isnull
returnsnull
In undirected graphs, the returned edge may have its source and target vertices in the opposite order.
- Parameters:
sourceVertex
- source vertex of the edge.targetVertex
- target vertex of the edge.
- Returns:
- an edge connecting source vertex to target vertex.
public EdgeFactory getEdgeFactory()
Returns the edge factory using which this graph creates new edges. The edge factory is defined when the graph is constructed and must not be modified.
- Returns:
- the edge factory using which this graph creates new edges.
public boolean removeAllEdges(Collection edges)
Removes all the edges in this graph that are also contained in the specified edge collection. After this call returns, this graph will contain no edges in common with the specified edges. This method will invoke theremoveEdge(Edge)
method.
- Parameters:
edges
- edges to be removed from this graph.
- Returns:
- true if this graph changed as a result of the call
- See Also:
removeEdge(Edge)
,containsEdge(Edge)
public List removeAllEdges(Object sourceVertex, Object targetVertex)
Removes all the edges going from the specified source vertex to the specified target vertex, and returns a list of all removed edges. Returnsnull
if any of the specified vertices does exist in the graph. If both vertices exist but no edge found, returns an empty list. This method will either invoke theremoveEdge(Edge)
method, or theremoveEdge(Object,Object)
method.
- Parameters:
sourceVertex
- source vertex of the edge.targetVertex
- target vertex of the edge.
- Returns:
- The removed edge, or
null
if no edge removed.
public boolean removeAllVertices(Collection vertices)
Removes all the vertices in this graph that are also contained in the specified vertex collection. After this call returns, this graph will contain no vertices in common with the specified vertices. This method will invoke theremoveVertex(Object)
method.
- Parameters:
vertices
- vertices to be removed from this graph.
- Returns:
- true if this graph changed as a result of the call
- See Also:
removeVertex(Object)
,containsVertex(Object)
public Edge removeEdge(Object sourceVertex, Object targetVertex)
Removes an edge going from source vertex to target vertex, if such vertices and such edge exist in this graph. Returns the edge if removed ornull
otherwise.
- Parameters:
sourceVertex
- source vertex of the edge.targetVertex
- target vertex of the edge.
- Returns:
- The removed edge, or
null
if no edge removed.
public boolean removeEdge(Edge e)
Removes the specified edge from the graph. Removes the specified edge from this graph if it is present. More formally, removes an edgee2
such thate2.equals(e)
, if the graph contains such edge. Returns true if the graph contained the specified edge. (The graph will not contain the specified edge once the call returns). If the specified edge isnull
returnsfalse
.
- Parameters:
e
- edge to be removed from this graph, if present.
- Returns:
true
if and only if the graph contained the specified edge.
public boolean removeVertex(Object v)
Removes the specified vertex from this graph including all its touching edges if present. More formally, if the graph contains a vertexu
such thatu.equals(v)
, the call removes all edges that touchu
and then removesu
itself. If no suchu
is found, the call leaves the graph unchanged. Returns true if the graph contained the specified vertex. (The graph will not contain the specified vertex once the call returns). If the specified vertex isnull
returnsfalse
.
- Parameters:
v
- vertex to be removed from this graph, if present.
- Returns:
true
if the graph contained the specified vertex;false
otherwise.
public Set vertexSet()
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. viajava.util.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.
- Returns:
- a set view of the vertices contained in this graph.