org.jgrapht.graph

Class UnmodifiableGraph<V,E>

java.lang.Object

org.jgrapht.graph.AbstractGraph<V,E>

org.jgrapht.graph.GraphDelegator<V,E>

org.jgrapht.graph.UnmodifiableGraph<V,E>

All Implemented Interfaces:

Serializable, Graph<V,E>

Direct Known Subclasses:

UnmodifiableDirectedGraph, UnmodifiableUndirectedGraph

public class UnmodifiableGraph<V,E>
extends GraphDelegator<V,E>
implements Serializable

An unmodifiable view of the backing graph specified in the constructor. This graph allows modules to provide users with "read-only" access to internal graphs. Query operations on this graph "read through" to the backing graph, and attempts to modify this graph result in an UnsupportedOperationException.

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.

Since:

Jul 24, 2003

Author:

Barak Naveh

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UnmodifiableGraph(Graph<V,E> g) Creates a new unmodifiable graph based on the specified backing graph.

Method Summary

Methods

Modifier and Type	Method and Description
E	addEdge(V sourceVertex, V targetVertex) Creates a new edge in this graph, going from the source vertex to the target vertex, and returns the created edge.
boolean	addEdge(V sourceVertex, V targetVertex, E e) Adds the specified edge to this graph, going from the source vertex to the target vertex.
boolean	addVertex(V v) Adds the specified vertex to this graph if not already present.
boolean	removeAllEdges(Collection<? extends E> edges) Removes all the edges in this graph that are also contained in the specified edge collection.
Set<E>	removeAllEdges(V sourceVertex, V targetVertex) Removes all the edges going from the specified source vertex to the specified target vertex, and returns a set of all removed edges.
boolean	removeAllVertices(Collection<? extends V> vertices) Removes all the vertices in this graph that are also contained in the specified vertex collection.
boolean	removeEdge(E e) Removes the specified edge from the graph.
E	removeEdge(V sourceVertex, V targetVertex) Removes an edge going from source vertex to target vertex, if such vertices and such edge exist in this graph.
boolean	removeVertex(V v) Removes the specified vertex from this graph including all its touching edges if present.

Methods inherited from class org.jgrapht.graph.GraphDelegator

containsEdge, containsVertex, degreeOf, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeFactory, getEdgeSource, getEdgeTarget, getEdgeWeight, incomingEdgesOf, inDegreeOf, outDegreeOf, outgoingEdgesOf, setEdgeWeight, toString, vertexSet

Methods inherited from class org.jgrapht.graph.AbstractGraph

assertVertexExist, containsEdge, equals, hashCode, removeAllEdges, toStringFromSets

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jgrapht.Graph

containsEdge

Constructor Detail

UnmodifiableGraph

public UnmodifiableGraph(Graph<V,E> g)

Creates a new unmodifiable graph based on the specified backing graph.

Parameters:

g - the backing graph on which an unmodifiable graph is to be created.

Method Detail

addEdge

public E addEdge(V sourceVertex,
        V targetVertex)

Description copied from interface: Graph

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 returns null.

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 edge e using this graph's EdgeFactory. For the new edge to be added e 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 edge e2 such that e2.equals(e). If such e2 is found then the newly created edge e is abandoned, the method leaves this graph unchanged returns null.

Specified by:

addEdge in interface Graph<V,E>

Overrides:

addEdge in class GraphDelegator<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.addEdge(Object, Object)

addEdge

public boolean addEdge(V sourceVertex,
              V targetVertex,
              E e)

Description copied from interface: Graph

Adds the specified edge to this graph, going from the source vertex to the target vertex. More formally, adds the specified edge, e, to this graph if this graph contains no edge e2 such that e2.equals(e). If this graph already contains such an edge, the call leaves this graph unchanged and returns false. 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 returns false. If the edge was added to the graph, returns true.

The source and target vertices must already be contained in this graph. If they are not found in graph IllegalArgumentException is thrown.

Specified by:

addEdge in interface Graph<V,E>

Overrides:

addEdge in class GraphDelegator<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, Object)

addVertex

public boolean addVertex(V v)

Description copied from interface: Graph

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 vertex u such that u.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.

Specified by:

addVertex in interface Graph<V,E>

Overrides:

addVertex in class GraphDelegator<V,E>

Parameters:

v - vertex to be added to this graph.

Returns:

true if this graph did not already contain the specified vertex.

See Also:

Graph.addVertex(Object)

removeAllEdges

public boolean removeAllEdges(Collection<? extends E> edges)

Description copied from interface: Graph

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 the Graph.removeEdge(Object) method.

Specified by:

removeAllEdges in interface Graph<V,E>

Overrides:

removeAllEdges in class AbstractGraph<V,E>

Parameters:

edges - edges to be removed from this graph.

Returns:

true if this graph changed as a result of the call

See Also:

Graph.removeAllEdges(Collection)

removeAllEdges

public Set<E> removeAllEdges(V sourceVertex,
                    V targetVertex)

Description copied from interface: Graph

Removes all the edges going from the specified source vertex to the specified target vertex, and returns a set of all removed edges. Returns null if any of the specified vertices does not exist in the graph. If both vertices exist but no edge is found, returns an empty set. This method will either invoke the Graph.removeEdge(Object) method, or the Graph.removeEdge(Object, Object) method.

Specified by:

removeAllEdges in interface Graph<V,E>

Overrides:

removeAllEdges in class AbstractGraph<V,E>

Parameters:

sourceVertex - source vertex of the edge.

targetVertex - target vertex of the edge.

Returns:

the removed edges, or null if either vertex is not part of graph

See Also:

Graph.removeAllEdges(Object, Object)

removeAllVertices

public boolean removeAllVertices(Collection<? extends V> vertices)

Description copied from interface: Graph

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 the Graph.removeVertex(Object) method.

Specified by:

removeAllVertices in interface Graph<V,E>

Overrides:

removeAllVertices in class AbstractGraph<V,E>

Parameters:

vertices - vertices to be removed from this graph.

Returns:

true if this graph changed as a result of the call

See Also:

Graph.removeAllVertices(Collection)

removeEdge

public boolean removeEdge(E e)

Description copied from interface: Graph

Removes the specified edge from the graph. Removes the specified edge from this graph if it is present. More formally, removes an edge e2 such that e2.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 is null returns false.

Specified by:

removeEdge in interface Graph<V,E>

Overrides:

removeEdge in class GraphDelegator<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.

See Also:

Graph.removeEdge(Object)

removeEdge

public E removeEdge(V sourceVertex,
           V targetVertex)

Description copied from interface: Graph

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 or null otherwise.

Specified by:

removeEdge in interface Graph<V,E>

Overrides:

removeEdge in class GraphDelegator<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.

See Also:

Graph.removeEdge(Object, Object)

removeVertex

public boolean removeVertex(V v)

Description copied from interface: Graph

Removes the specified vertex from this graph including all its touching edges if present. More formally, if the graph contains a vertex u such that u.equals(v), the call removes all edges that touch u and then removes u itself. If no such u 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 is null returns false.

Specified by:

removeVertex in interface Graph<V,E>

Overrides:

removeVertex in class GraphDelegator<V,E>

Parameters:

v - vertex to be removed from this graph, if present.

Returns:

true if the graph contained the specified vertex; false otherwise.

See Also:

Graph.removeVertex(Object)