java.lang.Object
- com.google.common.graph.EndpointPair<N>

All Implemented Interfaces:

Iterable<N>
```
@Beta
@Immutable(containerOf="N")
public abstract class EndpointPair<N>
extends Object
implements Iterable<N>
```
An immutable pair representing the two endpoints of an edge in a graph. The EndpointPair of a directed edge is an ordered pair of nodes (source() and target()). The EndpointPair of an undirected edge is an unordered pair of nodes (nodeU() and nodeV()).
The edge is a self-loop if, and only if, the two endpoints are equal.

Since:

20.0

Author:

James Sexton

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`N`	`adjacentNode(Object node)`	Returns the node that is adjacent to `node` along the origin edge.
`abstract boolean`	`equals(@Nullable Object obj)`	Two ordered `EndpointPair`s are equal if their `source()` and `target()` are equal.
`abstract int`	`hashCode()`	The hashcode of an ordered `EndpointPair` is equal to `Objects.hashCode(source(), target())`.
`abstract boolean`	`isOrdered()`	Returns `true` if this `EndpointPair` is an ordered pair (i.e.
`UnmodifiableIterator<N>`	`iterator()`	Iterates in the order `nodeU()`, `nodeV()`.
`N`	`nodeU()`	If this `EndpointPair` `isOrdered()` returns the `source()`; otherwise, returns an arbitrary (but consistent) endpoint of the origin edge.
`N`	`nodeV()`	Returns the node `adjacent` to `nodeU()` along the origin edge.
`static <N> EndpointPair<N>`	`ordered(N source, N target)`	Returns an `EndpointPair` representing the endpoints of a directed edge.
`abstract N`	`source()`	If this `EndpointPair` `isOrdered()`, returns the node which is the source.
`abstract N`	`target()`	If this `EndpointPair` `isOrdered()`, returns the node which is the target.
`static <N> EndpointPair<N>`	`unordered(N nodeU, N nodeV)`	Returns an `EndpointPair` representing the endpoints of an undirected edge.

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

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Method Detail
  - ordered
```
public static <N> EndpointPair<N> ordered(N source,
                                          N target)
```
    Returns an EndpointPair representing the endpoints of a directed edge.
  - unordered
```
public static <N> EndpointPair<N> unordered(N nodeU,
                                            N nodeV)
```
    Returns an EndpointPair representing the endpoints of an undirected edge.
  - source
```
public abstract N source()
```
    If this EndpointPair isOrdered(), returns the node which is the source.
    
    Throws:
    
    UnsupportedOperationException - if this EndpointPair is not ordered
  - target
```
public abstract N target()
```
    If this EndpointPair isOrdered(), returns the node which is the target.
    
    Throws:
    
    UnsupportedOperationException - if this EndpointPair is not ordered
  - nodeU
```
public final N nodeU()
```
    If this EndpointPair isOrdered() returns the source(); otherwise, returns an arbitrary (but consistent) endpoint of the origin edge.
  - nodeV
```
public final N nodeV()
```
    Returns the node adjacent to nodeU() along the origin edge. If this EndpointPair isOrdered(), this is equal to target().
  - adjacentNode
```
public final N adjacentNode(Object node)
```
    Returns the node that is adjacent to node along the origin edge.
    
    Throws:
    
    IllegalArgumentException - if this EndpointPair does not contain node
  - isOrdered
```
public abstract boolean isOrdered()
```
    Returns true if this EndpointPair is an ordered pair (i.e. represents the endpoints of a directed edge).
  - iterator
```
public final UnmodifiableIterator<N> iterator()
```
    Iterates in the order nodeU(), nodeV().
    
    Specified by:
    
    iterator in interface Iterable<N>
    
    Returns:
    
    an Iterator.
  - equals
```
public abstract boolean equals(@Nullable Object obj)
```
    Two ordered EndpointPairs are equal if their source() and target() are equal. Two unordered EndpointPairs are equal if they contain the same nodes. An ordered EndpointPair is never equal to an unordered EndpointPair.
    
    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 abstract int hashCode()
```
    The hashcode of an ordered EndpointPair is equal to Objects.hashCode(source(), target()). The hashcode of an unordered EndpointPair is equal to nodeU().hashCode() + nodeV().hashCode().
    
    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)

Class EndpointPair<N>

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.Iterable

Method Detail

ordered

unordered

source

target

nodeU

nodeV

adjacentNode

isOrdered

iterator

equals

hashCode