org.apache.hivemind.util
Class Defense

java.lang.Object
  org.apache.hivemind.util.Defense

public final class Defense
extends java.lang.Object

Simple utilities for defensive programming.

Since:

1.1

Author:

Howard M. Lewis Ship

Method Summary

static void	fieldNotNull(java.lang.Object value, java.lang.String fieldName) Check for null field value when not allowed.
static void	isAssignable(java.lang.Object parameter, java.lang.Class expectedType, java.lang.String parameterName) Check that a parameter is not null, and assignable to a particular type.
static void	notNull(java.lang.Object parameter, java.lang.String parameterName) Check for null parameter when not allowed.

Methods inherited from class java.lang.Object

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

Method Detail

notNull

public static void notNull(java.lang.Object parameter,
                           java.lang.String parameterName)

Check for null parameter when not allowed.

Throws:

java.lang.NullPointerException - if parameter is null (the message indicates the name of the parameter).

fieldNotNull

public static void fieldNotNull(java.lang.Object value,
                                java.lang.String fieldName)

Check for null field value when not allowed.

Throws:

java.lang.NullPointerException - if field is null (the message indicates the name of the field).

isAssignable

public static void isAssignable(java.lang.Object parameter,
                                java.lang.Class expectedType,
                                java.lang.String parameterName)

Check that a parameter is not null, and assignable to a particular type.

Throws:

java.lang.ClassCastException - if not assignable (with a useable message)