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

    java.lang.Object
      org.jgrapht.graph.AbstractGraph<V,E>

All Implemented Interfaces:
  Graph<V,E>

Direct Known Subclasses:
  AbstractBaseGraph, GraphDelegator, Subgraph

    public abstract class AbstractGraph<V,E>

extends java.lang.Object
implements Graph<V,E>

A skeletal implementation of the `Graph` interface, to minimize the effort required to implement graph interfaces. This implementation is applicable to both: directed graphs and undirected graphs.

Author:
  Barak Naveh
See Also:
  `Graph`, `DirectedGraph`, `UndirectedGraph`

Constructor Summary
`AbstractGraph()` Construct a new empty graph object.

Method Summary
`protected boolean` | `assertVertexExist(V v)` Ensures that the specified vertex exists in this graph, or else throws exception.
`boolean` | `containsEdge(V sourceVertex, V targetVertex)` Returns `true` if and only if this graph contains an edge going from the source vertex to the target vertex.
`boolean` | `removeAllEdges(java.util.Collection<? extends E> edges)` Removes all the edges in this graph that are also contained in the specified edge collection.
`protected boolean` | `removeAllEdges(E[] edges)` Removes all the edges in this graph that are also contained in the specified edge array.
`java.util.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(java.util.Collection<? extends V> vertices)` Removes all the vertices in this graph that are also contained in the specified vertex collection.
`java.lang.String` | `toString()` Returns a string of the parenthesized pair (V, E) representing this G=(V,E) graph.
`protected java.lang.String` | `toStringFromSets(java.util.Collection<? extends V> vertexSet, java.util.Collection<? extends E> edgeSet, boolean directed)` Helper for subclass implementations of toString( ).

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface org.jgrapht.Graph
`addEdge, addEdge, addVertex, containsEdge, containsVertex, edgeSet, edgesOf, getAllEdges, getEdge, getEdgeFactory, getEdgeSource, getEdgeTarget, getEdgeWeight, removeEdge, removeEdge, removeVertex, vertexSet`

Constructor Detail

### AbstractGraph

    public AbstractGraph()

  Construct a new empty graph object.

Method Detail

### containsEdge

    public boolean containsEdge(V sourceVertex,
                                V targetVertex)

  Description copied from interface: `Graph`
  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 is `null`, returns `false`.

  Specified by:
    `containsEdge` in interface `Graph<V,E>`
  Parameters:
    `sourceVertex` - source vertex of the edge.
    `targetVertex` - target vertex of the edge.
  Returns:
    `true` if this graph contains the specified edge.
  See Also:
    `Graph.containsEdge(Object, Object)`

### removeAllEdges

    public boolean removeAllEdges(java.util.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>`
  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 java.util.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>`
  Parameters:
    `sourceVertex` - source vertex of the edge.
    `targetVertex` - target vertex of the edge.
  Returns:
    the removed edges, or `null` if no either vertex not part of graph
  See Also:
    `Graph.removeAllEdges(Object, Object)`

### removeAllVertices

    public boolean removeAllVertices(java.util.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>`
  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)`

### toString

    public java.lang.String toString()

  Returns a string of the parenthesized pair (V, E) representing this G=(V,E) graph. 'V' is the string representation of the vertex set, and 'E' is the string representation of the edge set.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a string representation of this graph.

### assertVertexExist

    protected boolean assertVertexExist(V v)

  Ensures that the specified vertex exists in this graph, or else throws exception.

  Parameters:
    `v` - vertex
  Returns:
    `true` if this assertion holds.
  Throws:
    `java.lang.NullPointerException` - if specified vertex is `null`.
    `java.lang.IllegalArgumentException` - if specified vertex does not exist in this graph.

### removeAllEdges

    protected boolean removeAllEdges(E[] edges)

  Removes all the edges in this graph that are also contained in the specified edge array. 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.

  Parameters:
    `edges` - edges to be removed from this graph.
  Returns:
    `true` if this graph changed as a result of the call.
  See Also:
    `Graph.removeEdge(Object)`, `Graph.containsEdge(Object)`

### toStringFromSets

    protected java.lang.String toStringFromSets(java.util.Collection<? extends V> vertexSet,
                                                java.util.Collection<? extends E> edgeSet,
                                                boolean directed)

  Helper for subclass implementations of toString( ).

  Parameters:
    `vertexSet` - the vertex set V to be printed
    `edgeSet` - the edge set E to be printed
    `directed` - true to use parens for each edge (representing directed); false to use curly braces (representing undirected)
  Returns:
    a string representation of (V,E)

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