Module org.jgrapht.core
Package org.jgrapht.graph

Class AsUnmodifiableGraph<V,E>

java.lang.Object
org.jgrapht.graph.AbstractGraph<V,E>
org.jgrapht.graph.GraphDelegator<V,E>
org.jgrapht.graph.AsUnmodifiableGraph<V,E>
Type Parameters:
V - the graph vertex type
E - the graph edge type
All Implemented Interfaces:
Serializable, Graph<V,E>
public class AsUnmodifiableGraph<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.

Author:
Barak Naveh
See Also:

  • Constructor Details

    • AsUnmodifiableGraph

      public AsUnmodifiableGraph(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 Details

    • addEdge

      public E addEdge(V sourceVertex, V targetVertex)
      Description copied from class: GraphDelegator
      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, then 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 edge supplier (see Graph.getEdgeSupplier()). 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 and returns null.

      If the underlying graph implementation's Graph.getEdgeSupplier() returns null, then this method cannot create edges and throws an UnsupportedOperationException.

      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:

    • addEdge

      public boolean addEdge(V sourceVertex, V targetVertex, E e)
      Description copied from class: GraphDelegator
      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, then 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:

    • addVertex

      public V addVertex()
      Description copied from class: GraphDelegator
      Creates a new vertex in this graph and returns it.

      This method creates the new vertex v using this graph's vertex supplier (see Graph.getVertexSupplier()). For the new vertex to be added 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). If such v2 is found then the newly created vertex v is abandoned, the method leaves this graph unchanged and throws an IllegalArgumentException.

      If the underlying graph implementation's Graph.getVertexSupplier() returns null, then this method cannot create vertices and throws an UnsupportedOperationException.

      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:
      addVertex in interface Graph<V,E>
      Overrides:
      addVertex in class GraphDelegator<V,E>
      Returns:
      The newly created vertex if added to the graph.
      See Also:

    • addVertex

      public boolean addVertex(V v)
      Description copied from class: GraphDelegator
      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:

    • 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:

    • 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:

    • 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:

    • removeEdge

      public boolean removeEdge(E e)
      Description copied from class: GraphDelegator
      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:

    • removeEdge

      public E removeEdge(V sourceVertex, V targetVertex)
      Description copied from class: GraphDelegator
      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:

    • removeVertex

      public boolean removeVertex(V v)
      Description copied from class: GraphDelegator
      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:

    • getType

      public GraphType getType()
      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,E>
      Overrides:
      getType in class GraphDelegator<V,E>
      Returns:
      the graph type