com.github.davidmoten.geo.util

Class Preconditions

java.lang.Object

com.github.davidmoten.geo.util.Preconditions

public final class Preconditions
extends Object

Guava like Preconditions.

Method Summary

Modifier and Type	Method and Description
static void	checkArgument(boolean expression, Object errorMessage) Ensures the truth of an expression involving one or more parameters to the calling method.
static <T> T	checkNotNull(T reference, Object errorMessage) Ensures that an object reference passed as a parameter to the calling method is not null.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

checkArgument

public static void checkArgument(boolean expression,
                                 Object errorMessage)

Ensures the truth of an expression involving one or more parameters to the calling method.

Parameters:

expression - a boolean expression

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

Throws:

IllegalArgumentException - if expression is false

checkNotNull

public static <T> T checkNotNull(T reference,
                                 Object errorMessage)

Ensures that an object reference passed as a parameter to the calling method is not null.

Type Parameters:

T - type of object reference

Parameters:

reference - an object reference

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

Returns:

the non-null reference that was validated

Throws:

NullPointerException - if reference is null