N - Node parameter type@Beta public abstract class AbstractGraph<N> extends Object implements Graph<N>
Graph. It is recommended to extend this
class rather than implement Graph directly.| Constructor and Description |
|---|
AbstractGraph() |
| Modifier and Type | Method and Description |
|---|---|
int |
degree(N node)
Returns the count of
node's incident edges, counting self-loops twice (equivalently,
the number of times an edge touches node). |
protected long |
edgeCount()
Returns the number of edges in this graph; used to calculate the size of
edges(). |
Set<EndpointPair<N>> |
edges()
|
boolean |
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
boolean |
hasEdgeConnecting(N nodeU,
N nodeV)
Returns true if there is an edge directly connecting
nodeU to nodeV. |
int |
hashCode()
Returns a hash code value for the object.
|
int |
inDegree(N node)
Returns the count of
node's incoming edges (equal to predecessors(node).size())
in a directed graph. |
int |
outDegree(N node)
Returns the count of
node's outgoing edges (equal to successors(node).size())
in a directed graph. |
String |
toString()
Returns a string representation of this graph.
|
clone, finalize, getClass, notify, notifyAll, wait, wait, waitadjacentNodes, allowsSelfLoops, degree, edges, hasEdgeConnecting, inDegree, isDirected, nodeOrder, nodes, outDegree, predecessors, successorspublic AbstractGraph()
public final boolean equals(@Nullable Object obj)
java.lang.Object
The equals method implements an equivalence relation
on non-null object references:
x, x.equals(x) should return
true.
x and y, x.equals(y)
should return true if and only if
y.equals(x) returns true.
x, y, and z, if
x.equals(y) returns true and
y.equals(z) returns true, then
x.equals(z) should return true.
x and y, multiple invocations of
x.equals(y) consistently return true
or consistently return false, provided no
information used in equals comparisons on the
objects is modified.
x,
x.equals(null) should return false.
The equals method for class Object implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x and
y, this method returns true if and only
if x and y refer to the same object
(x == y has the value true).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode method, which states
that equal objects must have equal hash codes.
public final int hashCode()
java.lang.ObjectHashMap.
The general contract of hashCode is:
hashCode method
must consistently return the same integer, provided no information
used in equals comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
equals(Object)
method, then calling the hashCode method on each of
the two objects must produce the same integer result.
Object.equals(java.lang.Object)
method, then calling the hashCode method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
class Object does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
Java™ programming language.)
hashCode in interface Graph<N>hashCode in class ObjectObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)protected long edgeCount()
edges(). This
implementation requires O(|N|) time. Classes extending this one may manually keep track of the
number of edges as the graph is updated, and override this method for better performance.public Set<EndpointPair<N>> edges()
public int degree(N node)
node's incident edges, counting self-loops twice (equivalently,
the number of times an edge touches node).
For directed graphs, this is equal to inDegree(node) + outDegree(node).
For undirected graphs, this is equal to adjacentNodes(node).size() + (1 if node has an incident self-loop, 0 otherwise).
If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
public int inDegree(N node)
node's incoming edges (equal to predecessors(node).size())
in a directed graph. In an undirected graph, returns the degree(Object).
If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
public int outDegree(N node)
node's outgoing edges (equal to successors(node).size())
in a directed graph. In an undirected graph, returns the degree(Object).
If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
public boolean hasEdgeConnecting(N nodeU, N nodeV)
nodeU to nodeV. This is
equivalent to nodes().contains(nodeU) && successors(nodeU).contains(nodeV).
In an undirected graph, this is equal to hasEdgeConnecting(nodeV, nodeU).
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