AbstractNetwork (Guava: Google Core Libraries for Java 27.1-jre API)

java.lang.Object
- com.google.common.graph.AbstractNetwork<N,E>

Type Parameters:

N - Node parameter type

E - Edge parameter type

All Implemented Interfaces:

Network<N,E>, PredecessorsFunction<N>, SuccessorsFunction<N>

Direct Known Subclasses:

ImmutableNetwork
```
@Beta
public abstract class AbstractNetwork<N,E>
extends Object
implements Network<N,E>
```
This class provides a skeletal implementation of Network. It is recommended to extend this class rather than implement Network directly.
The methods implemented in this class should not be overridden unless the subclass admits a more efficient implementation.

Since:

20.0

Author:

James Sexton

Constructor Summary

Constructors
Constructor and Description

AbstractNetwork()

Constructors
Constructor and Description
`AbstractNetwork()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Set<E>`	`adjacentEdges(E edge)` Returns the edges which have an `incident node` in common with `edge`.
`Graph<N>`	`asGraph()` Returns a live view of this network as a `Graph`.
`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`).
`Optional<E>`	`edgeConnecting(EndpointPair<N> endpoints)` Returns the single edge that directly connects `endpoints` (in the order, if any, specified by `endpoints`), if one is present, or `Optional.empty()` if no such edge exists.
`Optional<E>`	`edgeConnecting(N nodeU, N nodeV)` Returns the single edge that directly connects `nodeU` to `nodeV`, if one is present, or `Optional.empty()` if no such edge exists.
`E`	`edgeConnectingOrNull(EndpointPair<N> endpoints)` Returns the single edge that directly connects `endpoints` (in the order, if any, specified by `endpoints`), if one is present, or `null` if no such edge exists.
`E`	`edgeConnectingOrNull(N nodeU, N nodeV)` Returns the single edge that directly connects `nodeU` to `nodeV`, if one is present, or `null` if no such edge exists.
`Set<E>`	`edgesConnecting(EndpointPair<N> endpoints)` Returns the set of edges that each directly connect `endpoints` (in the order, if any, specified by `endpoints`).
`Set<E>`	`edgesConnecting(N nodeU, N nodeV)` Returns the set of edges that each directly connect `nodeU` to `nodeV`.
`boolean`	`equals(@Nullable Object obj)` Indicates whether some other object is "equal to" this one.
`boolean`	`hasEdgeConnecting(EndpointPair<N> endpoints)` Returns true if there is an edge that directly connects `endpoints` (in the order, if any, specified by `endpoints`).
`boolean`	`hasEdgeConnecting(N nodeU, N nodeV)` Returns true if there is an edge that directly connects `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` in a directed network.
`protected boolean`	`isOrderingCompatible(EndpointPair<?> endpoints)`
`int`	`outDegree(N node)` Returns the count of `node`'s `outgoing edges` in a directed network.
`String`	`toString()` Returns a string representation of this network.
`protected void`	`validateEndpoints(EndpointPair<?> endpoints)` Throws an IllegalArgumentException if the ordering of `endpoints` is not compatible with the directionality of this graph.

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

Methods inherited from interface com.google.common.graph.Network
adjacentNodes, allowsParallelEdges, allowsSelfLoops, edgeOrder, edges, incidentEdges, incidentNodes, inEdges, isDirected, nodeOrder, nodes, outEdges, predecessors, successors

- Constructor Detail
  - AbstractNetwork
```
public AbstractNetwork()
```
- Method Detail
  - asGraph
```
public Graph<N> asGraph()
```
    Description copied from interface: Network
    
    Returns a live view of this network as a Graph. The resulting Graph will have an edge connecting node A to node B if this Network has an edge connecting A to B.
    If this network allows parallel edges, parallel edges will be treated as if collapsed into a single edge. For example, the Network.degree(Object) of a node in the Graph view may be less than the degree of the same node in this Network.
    
    Specified by:
    
    asGraph in interface Network<N,E>
  - degree
```
public int degree(N node)
```
    Description copied from interface: Network
    
    Returns the count of node's incident edges, counting self-loops twice (equivalently, the number of times an edge touches node).
    For directed networks, this is equal to inDegree(node) + outDegree(node).
    For undirected networks, this is equal to incidentEdges(node).size() + (number of self-loops incident to node).
    If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
    
    Specified by:
    
    degree in interface Network<N,E>
  - inDegree
```
public int inDegree(N node)
```
    Description copied from interface: Network
    
    Returns the count of node's incoming edges in a directed network. In an undirected network, returns the Network.degree(Object).
    If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
    
    Specified by:
    
    inDegree in interface Network<N,E>
  - outDegree
```
public int outDegree(N node)
```
    Description copied from interface: Network
    
    Returns the count of node's outgoing edges in a directed network. In an undirected network, returns the Network.degree(Object).
    If the count is greater than Integer.MAX_VALUE, returns Integer.MAX_VALUE.
    
    Specified by:
    
    outDegree in interface Network<N,E>
  - adjacentEdges
```
public Set<E> adjacentEdges(E edge)
```
    Description copied from interface: Network
    
    Returns the edges which have an incident node in common with edge. An edge is not considered adjacent to itself.
    
    Specified by:
    
    adjacentEdges in interface Network<N,E>
  - edgesConnecting
```
public Set<E> edgesConnecting(N nodeU,
                              N nodeV)
```
    Description copied from interface: Network
    
    Returns the set of edges that each directly connect nodeU to nodeV.
    In an undirected network, this is equal to edgesConnecting(nodeV, nodeU).
    The resulting set of edges will be parallel (i.e. have equal Network.incidentNodes(Object). If this network does not allow parallel edges, the resulting set will contain at most one edge (equivalent to edgeConnecting(nodeU, nodeV).asSet()).
    
    Specified by:
    
    edgesConnecting in interface Network<N,E>
  - edgesConnecting
```
public Set<E> edgesConnecting(EndpointPair<N> endpoints)
```
    Description copied from interface: Network
    
    Returns the set of edges that each directly connect endpoints (in the order, if any, specified by endpoints).
    The resulting set of edges will be parallel (i.e. have equal Network.incidentNodes(Object). If this network does not allow parallel edges, the resulting set will contain at most one edge (equivalent to edgeConnecting(endpoints).asSet()).
    If this network is directed, endpoints must be ordered.
    
    Specified by:
    
    edgesConnecting in interface Network<N,E>
  - edgeConnecting
```
public Optional<E> edgeConnecting(N nodeU,
                                  N nodeV)
```
    Description copied from interface: Network
    
    Returns the single edge that directly connects nodeU to nodeV, if one is present, or Optional.empty() if no such edge exists.
    In an undirected network, this is equal to edgeConnecting(nodeV, nodeU).
    
    Specified by:
    
    edgeConnecting in interface Network<N,E>
  - edgeConnecting
```
public Optional<E> edgeConnecting(EndpointPair<N> endpoints)
```
    Description copied from interface: Network
    
    Returns the single edge that directly connects endpoints (in the order, if any, specified by endpoints), if one is present, or Optional.empty() if no such edge exists.
    If this graph is directed, the endpoints must be ordered.
    
    Specified by:
    
    edgeConnecting in interface Network<N,E>
  - edgeConnectingOrNull
```
public E edgeConnectingOrNull(N nodeU,
                              N nodeV)
```
    Description copied from interface: Network
    
    Returns the single edge that directly connects nodeU to nodeV, if one is present, or null if no such edge exists.
    In an undirected network, this is equal to edgeConnectingOrNull(nodeV, nodeU).
    
    Specified by:
    
    edgeConnectingOrNull in interface Network<N,E>
  - edgeConnectingOrNull
```
public E edgeConnectingOrNull(EndpointPair<N> endpoints)
```
    Description copied from interface: Network
    
    Returns the single edge that directly connects endpoints (in the order, if any, specified by endpoints), if one is present, or null if no such edge exists.
    If this graph is directed, the endpoints must be ordered.
    
    Specified by:
    
    edgeConnectingOrNull in interface Network<N,E>
  - hasEdgeConnecting
```
public boolean hasEdgeConnecting(N nodeU,
                                 N nodeV)
```
    Description copied from interface: Network
    
    Returns true if there is an edge that directly connects nodeU to nodeV. This is equivalent to nodes().contains(nodeU) && successors(nodeU).contains(nodeV), and to edgeConnectingOrNull(nodeU, nodeV) != null.
    In an undirected graph, this is equal to hasEdgeConnecting(nodeV, nodeU).
    
    Specified by:
    
    hasEdgeConnecting in interface Network<N,E>
  - hasEdgeConnecting
```
public boolean hasEdgeConnecting(EndpointPair<N> endpoints)
```
    Description copied from interface: Network
    
    Returns true if there is an edge that directly connects endpoints (in the order, if any, specified by endpoints).
    Unlike the other EndpointPair-accepting methods, this method does not throw if the endpoints are unordered and the graph is directed; it simply returns false. This is for consistency with Graph.hasEdgeConnecting(EndpointPair) and ValueGraph.hasEdgeConnecting(EndpointPair).
    
    Specified by:
    
    hasEdgeConnecting in interface Network<N,E>
  - validateEndpoints
```
protected final void validateEndpoints(EndpointPair<?> endpoints)
```
    Throws an IllegalArgumentException if the ordering of endpoints is not compatible with the directionality of this graph.
  - isOrderingCompatible
```
protected final boolean isOrderingCompatible(EndpointPair<?> endpoints)
```
  - equals
```
public final boolean equals(@Nullable Object obj)
```
    Description copied from class: java.lang.Object
    Indicates whether some other object is "equal to" this one.
    The equals method implements an equivalence relation on non-null object references:
    - It is reflexive: for any non-null reference value x, x.equals(x) should return true.
    - It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
    - It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
    - It is consistent: for any non-null reference values 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.
    - For any non-null reference value 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.
    Specified by:
    
    equals in interface Network<N,E>
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    obj - the reference object with which to compare.
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    See Also:
    
    Object.hashCode(), HashMap
  - hashCode
```
public final int hashCode()
```
    Description copied from class: java.lang.Object
    Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.
    The general contract of hashCode is:
    - Whenever it is invoked on the same object more than once during an execution of a Java application, the 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.
    - If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
    - It is not required that if two objects are unequal according to the 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.)
    Specified by:
    
    hashCode in interface Network<N,E>
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this object.
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - toString
```
public String toString()
```
    Returns a string representation of this network.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of the object.

Class AbstractNetwork<N,E>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface com.google.common.graph.Network

Constructor Detail

AbstractNetwork

Method Detail

asGraph

degree

inDegree

outDegree

adjacentEdges

edgesConnecting

edgesConnecting

edgeConnecting

edgeConnecting

edgeConnectingOrNull

edgeConnectingOrNull

hasEdgeConnecting

hasEdgeConnecting

validateEndpoints

isOrderingCompatible

equals

hashCode

toString