```
public interface UpgradeManager
```
UpgradeManager is responsible for creating a list of UpgradeTasks. For simple upgrades (standard version build 20 to standard version build 21, for example) it's a simple list for that kind of version. A more sophisticated one (upgrade from standard to enterprise version, for example) can be modeled as a composite subclass of two UpgradeManagers. Note that all license specific code is strictly put into the corresponding subclass, so whatever check for enterprise license or things like that is in a specific subclass and not in form of if(enterprise) do bla code spread here and there.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`List<UpgradeError>`	`getErrors()`
`boolean`	`isUpgraded()`
`boolean`	`needUpgrade()`
`void`	`upgrade(com.atlassian.johnson.JohnsonEventContainer agentJohnson)`

Interface UpgradeManager