NullUtil

public class NullUtil
extends Object

java.lang.Object
↳	com.android.tradefed.util.NullUtil

A class with utility functions to help with dealing with null

Summary

Public constructors
`NullUtil()`

Public methods
`static boolean`	`allNull(Object... objs)` Checks if all objects are null.
`static int`	`countNonNulls(Object... objs)` Counts non-`null` objects in the passed set
`static int`	`countNulls(Object... objs)` Counts `null` objects in the passed set
`static boolean`	`isHomogeneousSet(Object... objs)` Check if every object is null, or every object is non-null.
`static boolean`	`singleNonNull(Object... objs)` Checks if exactly one object is non-null.

Public constructors

NullUtil

public NullUtil ()

Public methods

allNull

public static boolean allNull (Object... objs)

Checks if all objects are null. Uses short-circuit logic, so may be more efficient than countNonNulls(Object) for sets of many objects.

Parameters
`objs`	`Object`

Returns
`boolean`	`false` if any passed objects are non-null. `true` otherwise. In particular, returns true of no objects are passed.

countNonNulls

public static int countNonNulls (Object... objs)

Counts non-null objects in the passed set

Parameters
`objs`	`Object`

Returns
`int`

countNulls

public static int countNulls (Object... objs)

Counts null objects in the passed set

Parameters
`objs`	`Object`

Returns
`int`

isHomogeneousSet

public static boolean isHomogeneousSet (Object... objs)

Check if every object is null, or every object is non-null. Uses short-circuit logic, so may be more efficient than countNulls(Object) and countNonNulls(Object) for sets of many objects.

Parameters
`objs`	`Object`

Returns
`boolean`	`true` if every object is `null` or if every object is non-`null`. `false` otherwise.

singleNonNull

public static boolean singleNonNull (Object... objs)

Checks if exactly one object is non-null. Uses short-circuit logic, so may be more efficient than countNonNulls(Object) for sets of many objects.

Parameters
`objs`	`Object`

Returns
`boolean`	`true` if there is exactly one non-`null` object in the list. `false` otherwise.