```
public class Preconditions
extends Object
```
Utils for checking preconditions and invariants

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`checkEmptyString(String string, String errorMsg)`	Checks that a string is not null or empty
`static void`	`checkNotNull(Object object, String errorMsg)`	Checks that an object is not null.
`static void`	`checkValidOAuthCallback(String url, String errorMsg)`	Checks that a URL is a valid OAuth callback
`static void`	`checkValidUrl(String url, String errorMsg)`	Checks that a URL is valid

public static void checkValidUrl(String url,
                                 String errorMsg)

Checks that a URL is valid

public static void checkValidOAuthCallback(String url,
                                           String errorMsg)

Checks that a URL is a valid OAuth callback

Class Preconditions