com.ibm.watson.developer_cloud.util

Class Validator

java.lang.Object

com.ibm.watson.developer_cloud.util.Validator

public final class Validator
extends Object

This class assists in validating arguments.
If an argument value is deemed invalid, an IllegalArgumentException is thrown.

Method Summary

Modifier and Type	Method and Description
static void	isNull(Object object, String message) Validates that the specified argument is null; otherwise throwing an exception with the specified message.
static void	isTrue(boolean expression, String message) Validates that the argument condition is true; otherwise throwing an exception with the specified message.
static void	notEmpty(Collection collection, String message) Validates that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message.
static void	notEmpty(Object[] array, String message) Validates that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception with the specified message.
static void	notEmpty(String string, String message) Validator that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.
static void	notNull(Object object, String message) Validates that the specified argument is not null; otherwise throwing an exception with the specified message.

Methods inherited from class java.lang.Object

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

Method Detail

isTrue

public static void isTrue(boolean expression,
                          String message)

Validates that the argument condition is true; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.

Parameters:

expression - the boolean expression to check

message - the exception message if invalid

Throws:

IllegalArgumentException - if expression is false

notEmpty

public static void notEmpty(Collection collection,
                            String message)

Validates that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message.

Parameters:

collection - the collection to check

message - the exception message if invalid

Throws:

IllegalArgumentException - if the collection is empty

notEmpty

public static void notEmpty(Object[] array,
                            String message)

Validates that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception with the specified message.

Parameters:

array - the array to check

message - the exception message if invalid

Throws:

IllegalArgumentException - if the array is empty

notEmpty

public static void notEmpty(String string,
                            String message)

Validator that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.

Parameters:

string - the string to check

message - the exception message if invalid

Throws:

IllegalArgumentException - if the string is empty

notNull

public static void notNull(Object object,
                           String message)

Validates that the specified argument is not null; otherwise throwing an exception with the specified message.

Parameters:

object - the object to check

message - the exception message if invalid

isNull

public static void isNull(Object object,
                          String message)

Validates that the specified argument is null; otherwise throwing an exception with the specified message.

Parameters:

object - the object to check

message - the exception message if invalid