Zone (PLANitAllJava 0.1.0 API)

All Known Implementing Classes:

ZoneImpl
```
public interface Zone
```
Zone represent a geographical area with a centroid which in turn represent the single point of departure of all traffic in the zone

Author:

markr

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Centroid`	`getCentroid()`	Returns the centroid of this zone
`Object`	`getExternalId()`	Returns the external id of this zone
`long`	`getId()`	Returns the unique id of this zone
`boolean`	`hasExternalId()`	Returns whether this zone has its external Id set

- Method Detail
  - getId
```
long getId()
```
    Returns the unique id of this zone
    
    Returns:
    
    id of this zone
  - getExternalId
```
Object getExternalId()
```
    Returns the external id of this zone
    
    Returns:
    
    the external id
  - hasExternalId
```
boolean hasExternalId()
```
    Returns whether this zone has its external Id set
    
    Returns:
    
    true if the external id has been set, false otherwise
  - getCentroid
```
Centroid getCentroid()
```
    Returns the centroid of this zone
    
    Returns:
    
    centroid of this zone