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

Class DefaultListenableGraph<V,​E>

java.lang.Object
org.jgrapht.graph.AbstractGraph<V,​E>
org.jgrapht.graph.GraphDelegator<V,​E>
org.jgrapht.graph.DefaultListenableGraph<V,​E>
Type Parameters:
V - the graph vertex type
E - the graph edge type
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable, Graph<V,​E>, ListenableGraph<V,​E>
public class DefaultListenableGraph<V,​E>
extends GraphDelegator<V,​E>
implements ListenableGraph<V,​E>, java.lang.Cloneable
A graph backed by the the graph specified at the constructor, which can be listened by GraphListener s and by VertexSetListener s. Operations on this graph "pass through" to the to the backing graph. Any modification made to this graph or the backing graph is reflected by the other.

This graph does not pass the hashCode and equals operations through to the backing graph, but relies on Object's equals and hashCode methods.

Author:
Barak Naveh
See Also:
GraphListener, VertexSetListener, Serialized Form

  • Constructor Details

    • DefaultListenableGraph

      public DefaultListenableGraph​(Graph<V,​E> g)
      Creates a new listenable graph.
      Parameters:
      g - the backing graph.

    • DefaultListenableGraph

      public DefaultListenableGraph​(Graph<V,​E> g, boolean reuseEvents)
      Creates a new listenable graph. If the reuseEvents flag is set to true this class will reuse previously fired events and will not create a new object for each event. This option increases performance but should be used with care, especially in multithreaded environment.
      Parameters:
      g - the backing graph.
      reuseEvents - whether to reuse previously fired event objects instead of creating a new event object for each event.
      Throws:
      java.lang.IllegalArgumentException - if the backing graph is already a listenable graph.

  • Method Details

    • setReuseEvents

      public void setReuseEvents​(boolean reuseEvents)
      If the reuseEvents flag is set to true this class will reuse previously fired events and will not create a new object for each event. This option increases performance but should be used with care, especially in multithreaded environment.
      Parameters:
      reuseEvents - whether to reuse previously fired event objects instead of creating a new event object for each event.

    • isReuseEvents

      public boolean isReuseEvents()
      Tests whether the reuseEvents flag is set. If the flag is set to true this class will reuse previously fired events and will not create a new object for each event. This option increases performance but should be used with care, especially in multithreaded environment.
      Returns:
      the value of the reuseEvents flag.

    • 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:
      Graph.getEdgeSupplier()

    • 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:
      Graph.addEdge(Object, Object), Graph.getEdgeSupplier()

    • addGraphListener

      public void addGraphListener​(GraphListener<V,​E> l)
      Description copied from interface: ListenableGraph
      Adds the specified graph listener to this graph, if not already present.
      Specified by:
      addGraphListener in interface ListenableGraph<V,​E>
      Parameters:
      l - the listener to be added.

    • 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:
      Graph.getVertexSupplier()

    • 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.

    • addVertexSetListener

      public void addVertexSetListener​(VertexSetListener<V> l)
      Description copied from interface: ListenableGraph
      Adds the specified vertex set listener to this graph, if not already present.
      Specified by:
      addVertexSetListener in interface ListenableGraph<V,​E>
      Parameters:
      l - the listener to be added.

    • clone

      public java.lang.Object clone()
      Overrides:
      clone in class java.lang.Object

    • 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.

    • 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.

    • removeGraphListener

      public void removeGraphListener​(GraphListener<V,​E> l)
      Description copied from interface: ListenableGraph
      Removes the specified graph listener from this graph, if present.
      Specified by:
      removeGraphListener in interface ListenableGraph<V,​E>
      Parameters:
      l - the listener to be removed.

    • 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.

    • setEdgeWeight

      public void setEdgeWeight​(E e, double weight)
      Description copied from class: GraphDelegator
      Assigns a weight to an edge.
      Specified by:
      setEdgeWeight in interface Graph<V,​E>
      Overrides:
      setEdgeWeight in class GraphDelegator<V,​E>
      Parameters:
      e - edge on which to set weight
      weight - new weight for edge

    • removeVertexSetListener

      public void removeVertexSetListener​(VertexSetListener<V> l)
      Description copied from interface: ListenableGraph
      Removes the specified vertex set listener from this graph, if present.
      Specified by:
      removeVertexSetListener in interface ListenableGraph<V,​E>
      Parameters:
      l - the listener to be removed.

    • fireEdgeAdded

      protected void fireEdgeAdded​(E edge, V source, V target, double weight)
      Notify listeners that the specified edge was added.
      Parameters:
      edge - the edge that was added.
      source - edge source
      target - edge target
      weight - edge weight

    • fireEdgeRemoved

      protected void fireEdgeRemoved​(E edge, V source, V target, double weight)
      Notify listeners that the specified edge was removed.
      Parameters:
      edge - the edge that was removed.
      source - edge source
      target - edge target
      weight - edge weight

    • fireEdgeWeightUpdated

      protected void fireEdgeWeightUpdated​(E edge, V source, V target, double weight)
      Notify listeners that the weight of an edge has changed.
      Parameters:
      edge - the edge whose weight has changed.
      source - edge source
      target - edge target
      weight - the edge weight

    • fireVertexAdded

      protected void fireVertexAdded​(V vertex)
      Notify listeners that the specified vertex was added.
      Parameters:
      vertex - the vertex that was added.

    • fireVertexRemoved

      protected void fireVertexRemoved​(V vertex)
      Notify listeners that the specified vertex was removed.
      Parameters:
      vertex - the vertex that was removed.