Class DefaultListenableGraph

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, Graph, ListenableGraph
    Direct Known Subclasses:
    ListenableDirectedGraph, ListenableUndirectedGraph

    public class DefaultListenableGraph
    extends GraphDelegator
    implements ListenableGraph, java.lang.Cloneable
    A graph backed by the the graph specified at the constructor, which can be listened by GraphListeners and by VertexSetListeners. 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.

    Since:
    Jul 20, 2003
    Author:
    Barak Naveh
    See Also:
    GraphListener, VertexSetListener, Serialized Form
    • Constructor Detail

      • DefaultListenableGraph

        public DefaultListenableGraph​(Graph g)
        Creates a new listenable graph.
        Parameters:
        g - the backing graph.
      • DefaultListenableGraph

        public DefaultListenableGraph​(Graph 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 Detail

      • 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 Edge addEdge​(java.lang.Object sourceVertex,
                            java.lang.Object 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
        Overrides:
        addEdge in class GraphDelegator
        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​(Edge e)
        Description copied from interface: Graph
        Adds the specified edge to this graph. 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 edge, the call leaves this graph unchanged and returns false. If the edge was added to the graph, returns true.

        Some graphs do not allow edge-multiplicity. In such cases, if the graph already contains an edge going from e.getSource() vertex to e.getTarget() vertex, than this method does not change the graph and returns false.

        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.

        Specified by:
        addEdge in interface Graph
        Overrides:
        addEdge in class GraphDelegator
        Parameters:
        e - edge to be added to this graph.
        Returns:
        true if this graph did not already contain the specified edge.
        See Also:
        Graph.addEdge(Edge)
      • addVertex

        public boolean addVertex​(java.lang.Object 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
        Overrides:
        addVertex in class GraphDelegator
        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)
      • clone

        public java.lang.Object clone()
        Overrides:
        clone in class java.lang.Object
        See Also:
        Object.clone()
      • removeEdge

        public Edge removeEdge​(java.lang.Object sourceVertex,
                               java.lang.Object 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
        Overrides:
        removeEdge in class GraphDelegator
        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)
      • removeEdge

        public boolean removeEdge​(Edge 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
        Overrides:
        removeEdge in class GraphDelegator
        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(Edge)
      • removeVertex

        public boolean removeVertex​(java.lang.Object 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
        Overrides:
        removeVertex in class GraphDelegator
        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)
      • fireEdgeAdded

        protected void fireEdgeAdded​(Edge edge)
        Notify listeners that the specified edge was added.
        Parameters:
        edge - the edge that was added.
      • fireEdgeRemoved

        protected void fireEdgeRemoved​(Edge edge)
        Notify listeners that the specified edge was removed.
        Parameters:
        edge - the edge that was removed.
      • fireVertexAdded

        protected void fireVertexAdded​(java.lang.Object vertex)
        Notify listeners that the specified vertex was added.
        Parameters:
        vertex - the vertex that was added.
      • fireVertexRemoved

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