Class Validate

java.lang.Object

org.apache.commons.lang3.Validate

public class Validate
extends Object

This class assists in validating arguments. The validation methods are based along the following principles:

• An invalid null argument causes a NullPointerException.
• A non-null argument causes an IllegalArgumentException.
• An invalid index into an array/collection/map/string causes an IndexOutOfBoundsException.

All exceptions messages are format strings as defined by the Java platform. For example:

Validate.isTrue(i > 0, "The value must be greater than zero: %d", i);
Validate.notNull(surname, "The surname must not be %s", null);

#ThreadSafe#

Since:

2.0

See Also:

• String.format(String, Object...)

Constructor Summary

Constructors

Constructor	Description
Validate()	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
static void	exclusiveBetween(double start, double end, double value)	Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception.
static void	exclusiveBetween(double start, double end, double value, String message)	Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception with the specified message.
static void	exclusiveBetween(long start, long end, long value)	Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception.
static void	exclusiveBetween(long start, long end, long value, String message)	Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception with the specified message.
static <T> void	exclusiveBetween(T start, T end, Comparable<T> value)	Validate that the specified argument object fall between the two exclusive values specified; otherwise, throws an exception.
static <T> void	exclusiveBetween(T start, T end, Comparable<T> value, String message, Object... values)	Validate that the specified argument object fall between the two exclusive values specified; otherwise, throws an exception with the specified message.
static void	finite(double value)	Validates that the specified argument is not infinite or Not-a-Number (NaN); otherwise throwing an exception.
static void	finite(double value, String message, Object... values)	Validates that the specified argument is not infinite or Not-a-Number (NaN); otherwise throwing an exception with the specified message.
static void	inclusiveBetween(double start, double end, double value)	Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception.
static void	inclusiveBetween(double start, double end, double value, String message)	Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception with the specified message.
static void	inclusiveBetween(long start, long end, long value)	Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception.
static void	inclusiveBetween(long start, long end, long value, String message)	Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception with the specified message.
static <T> void	inclusiveBetween(T start, T end, Comparable<T> value)	Validate that the specified argument object fall between the two inclusive values specified; otherwise, throws an exception.
static <T> void	inclusiveBetween(T start, T end, Comparable<T> value, String message, Object... values)	Validate that the specified argument object fall between the two inclusive values specified; otherwise, throws an exception with the specified message.
static void	isAssignableFrom(Class<?> superType, Class<?> type)	Validates that the argument can be converted to the specified class, if not, throws an exception.
static void	isAssignableFrom(Class<?> superType, Class<?> type, String message, Object... values)	Validates that the argument can be converted to the specified class, if not throws an exception.
static void	isInstanceOf(Class<?> type, Object obj)	Validates that the argument is an instance of the specified class, if not throws an exception.
static void	isInstanceOf(Class<?> type, Object obj, String message, Object... values)	Validate that the argument is an instance of the specified class; otherwise throwing an exception with the specified message.
static void	isTrue(boolean expression)	Validate that the argument condition is true; otherwise throwing an exception.
static void	isTrue(boolean expression, String message, double value)	Validate that the argument condition is true; otherwise throwing an exception with the specified message.
static void	isTrue(boolean expression, String message, long value)	Validate that the argument condition is true; otherwise throwing an exception with the specified message.
static void	isTrue(boolean expression, String message, Object... values)	Validate that the argument condition is true; otherwise throwing an exception with the specified message.
static void	isTrue(boolean expression, Supplier<String> messageSupplier)	Validate that the argument condition is true; otherwise throwing an exception with the specified message.
static void	matchesPattern(CharSequence input, String pattern)	Validate that the specified argument character sequence matches the specified regular expression pattern; otherwise throwing an exception.
static void	matchesPattern(CharSequence input, String pattern, String message, Object... values)	Validate that the specified argument character sequence matches the specified regular expression pattern; otherwise throwing an exception with the specified message.
static <T extends Iterable<?>> T	noNullElements(T iterable)	Validate that the specified argument iterable is neither null nor contains any elements that are null; otherwise throwing an exception.
static <T> T[]	noNullElements(T[] array)	Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception.
static <T> T[]	noNullElements(T[] array, String message, Object... values)	Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.
static <T extends Iterable<?>> T	noNullElements(T iterable, String message, Object... values)	Validate that the specified argument iterable is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.
static <T extends CharSequence> T	notBlank(T chars)	Validates that the specified argument character sequence is neither null, a length of zero (no characters), empty nor whitespace; otherwise throwing an exception.
static <T extends CharSequence> T	notBlank(T chars, String message, Object... values)	Validates that the specified argument character sequence is not blank (whitespaces, empty ("") or null); otherwise throwing an exception with the specified message.
static <T extends CharSequence> T	notEmpty(T chars)	Validates that the specified argument character sequence is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.
static <T extends Collection<?>> T	notEmpty(T collection)	Validates that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception.
static <T extends Map<?,?>> T	notEmpty(T map)	Validates that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception.
static <T> T[]	notEmpty(T[] array)	Validates that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception.
static <T> T[]	notEmpty(T[] array, String message, Object... values)	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 <T extends CharSequence> T	notEmpty(T chars, String message, Object... values)	Validate that the specified argument character sequence is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.
static <T extends Collection<?>> T	notEmpty(T collection, String message, Object... values)	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 <T extends Map<?,?>> T	notEmpty(T map, String message, Object... values)	Validate that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message.
static void	notNaN(double value)	Validates that the specified argument is not Not-a-Number (NaN); otherwise throwing an exception.
static void	notNaN(double value, String message, Object... values)	Validates that the specified argument is not Not-a-Number (NaN); otherwise throwing an exception with the specified message.
static <T> T	notNull(T object)	Deprecated. Use Objects.requireNonNull(Object).
static <T> T	notNull(T object, String message, Object... values)	Validate that the specified argument is not null; otherwise throwing an exception with the specified message.
static <T> T[]	validIndex(T[] array, int index)	Validates that the index is within the bounds of the argument array; otherwise throwing an exception.
static <T> T[]	validIndex(T[] array, int index, String message, Object... values)	Validates that the index is within the bounds of the argument array; otherwise throwing an exception with the specified message.
static <T extends CharSequence> T	validIndex(T chars, int index)	Validates that the index is within the bounds of the argument character sequence; otherwise throwing an exception.
static <T extends Collection<?>> T	validIndex(T collection, int index)	Validates that the index is within the bounds of the argument collection; otherwise throwing an exception.
static <T extends CharSequence> T	validIndex(T chars, int index, String message, Object... values)	Validates that the index is within the bounds of the argument character sequence; otherwise throwing an exception with the specified message.
static <T extends Collection<?>> T	validIndex(T collection, int index, String message, Object... values)	Validates that the index is within the bounds of the argument collection; otherwise throwing an exception with the specified message.
static void	validState(boolean expression)	Validate that the stateful condition is true; otherwise throwing an exception.
static void	validState(boolean expression, String message, Object... values)	Validate that the stateful condition is true; otherwise throwing an exception with the specified message.

Methods inherited from class Object

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

Constructor Details

Validate

public Validate()

Constructs a new instance. This class should not normally be instantiated.

Method Details

exclusiveBetween

public static void exclusiveBetween(double start,
 double end,
 double value)

Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception.

Validate.exclusiveBetween(0.1, 2.1, 1.1);

Parameters:

start - the exclusive start value.

end - the exclusive end value.

value - the value to validate.

Throws:

IllegalArgumentException - if the value falls out of the boundaries.

Since:

3.3

exclusiveBetween

public static void exclusiveBetween(double start,
 double end,
 double value,
 String message)

Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception with the specified message.

Validate.exclusiveBetween(0.1, 2.1, 1.1, "Not in range");

Parameters:

start - the exclusive start value.

end - the exclusive end value.

value - the value to validate.

message - the exception message if invalid, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.3

exclusiveBetween

public static void exclusiveBetween(long start,
 long end,
 long value)

Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception.

Validate.exclusiveBetween(0, 2, 1);

Parameters:

start - the exclusive start value.

end - the exclusive end value.

value - the value to validate.

Throws:

IllegalArgumentException - if the value falls out of the boundaries.

Since:

3.3

exclusiveBetween

public static void exclusiveBetween(long start,
 long end,
 long value,
 String message)

Validate that the specified primitive value falls between the two exclusive values specified; otherwise, throws an exception with the specified message.

Validate.exclusiveBetween(0, 2, 1, "Not in range");

Parameters:

start - the exclusive start value.

end - the exclusive end value.

value - the value to validate.

message - the exception message if invalid, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.3

exclusiveBetween

public static <T> void exclusiveBetween(T start,
 T end,
 Comparable<T> value)

Validate that the specified argument object fall between the two exclusive values specified; otherwise, throws an exception.

Validate.exclusiveBetween(0, 2, 1);

Type Parameters:

T - the type of the argument object.

Parameters:

start - the exclusive start value, not null.

end - the exclusive end value, not null.

value - the object to validate, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.0

See Also:

• exclusiveBetween(Object, Object, Comparable, String, Object...)

exclusiveBetween

public static <T> void exclusiveBetween(T start,
 T end,
 Comparable<T> value,
 String message,
 Object... values)

Validate that the specified argument object fall between the two exclusive values specified; otherwise, throws an exception with the specified message.

Validate.exclusiveBetween(0, 2, 1, "Not in boundaries");

Type Parameters:

T - the type of the argument object.

Parameters:

start - the exclusive start value, not null.

end - the exclusive end value, not null.

value - the object to validate, not null.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.0

See Also:

• exclusiveBetween(Object, Object, Comparable)

finite

public static void finite(double value)

Validates that the specified argument is not infinite or Not-a-Number (NaN); otherwise throwing an exception.

Validate.finite(myDouble);

The message of the exception is "The value is invalid: %f".

Parameters:

value - the value to validate.

Throws:

IllegalArgumentException - if the value is infinite or Not-a-Number (NaN).

Since:

3.5

See Also:

• finite(double, String, Object...)

finite

public static void finite(double value,
 String message,
 Object... values)

Validates that the specified argument is not infinite or Not-a-Number (NaN); otherwise throwing an exception with the specified message.

Validate.finite(myDouble, "The argument must contain a numeric value");

Parameters:

value - the value to validate.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message.

Throws:

IllegalArgumentException - if the value is infinite or Not-a-Number (NaN).

Since:

3.5

See Also:

• finite(double)

inclusiveBetween

public static void inclusiveBetween(double start,
 double end,
 double value)

Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception.

Validate.inclusiveBetween(0.1, 2.1, 1.1);

Parameters:

start - the inclusive start value.

end - the inclusive end value.

value - the value to validate.

Throws:

IllegalArgumentException - if the value falls outside the boundaries (inclusive).

Since:

3.3

inclusiveBetween

public static void inclusiveBetween(double start,
 double end,
 double value,
 String message)

Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception with the specified message.

Validate.inclusiveBetween(0.1, 2.1, 1.1, "Not in range");

Parameters:

start - the inclusive start value.

end - the inclusive end value.

value - the value to validate.

message - the exception message if invalid, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.3

inclusiveBetween

public static void inclusiveBetween(long start,
 long end,
 long value)

Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception.

Validate.inclusiveBetween(0, 2, 1);

Parameters:

start - the inclusive start value.

end - the inclusive end value.

value - the value to validate.

Throws:

IllegalArgumentException - if the value falls outside the boundaries (inclusive).

Since:

3.3

inclusiveBetween

public static void inclusiveBetween(long start,
 long end,
 long value,
 String message)

Validate that the specified primitive value falls between the two inclusive values specified; otherwise, throws an exception with the specified message.

Validate.inclusiveBetween(0, 2, 1, "Not in range");

Parameters:

start - the inclusive start value.

end - the inclusive end value.

value - the value to validate.

message - the exception message if invalid, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.3

inclusiveBetween

public static <T> void inclusiveBetween(T start,
 T end,
 Comparable<T> value)

Validate that the specified argument object fall between the two inclusive values specified; otherwise, throws an exception.

Validate.inclusiveBetween(0, 2, 1);

Type Parameters:

T - the type of the argument object.

Parameters:

start - the inclusive start value, not null.

end - the inclusive end value, not null.

value - the object to validate, not null.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.0

See Also:

• inclusiveBetween(Object, Object, Comparable, String, Object...)

inclusiveBetween

public static <T> void inclusiveBetween(T start,
 T end,
 Comparable<T> value,
 String message,
 Object... values)

Validate that the specified argument object fall between the two inclusive values specified; otherwise, throws an exception with the specified message.

Validate.inclusiveBetween(0, 2, 1, "Not in boundaries");

Type Parameters:

T - the type of the argument object.

Parameters:

start - the inclusive start value, not null.

end - the inclusive end value, not null.

value - the object to validate, not null.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if the value falls outside the boundaries.

Since:

3.0

See Also:

• inclusiveBetween(Object, Object, Comparable)

isAssignableFrom

public static void isAssignableFrom(Class<?> superType,
 Class<?> type)

Validates that the argument can be converted to the specified class, if not, throws an exception.

This method is useful when validating that there will be no casting errors.

Validate.isAssignableFrom(SuperClass.class, object.getClass());

The message format of the exception is "Cannot assign {type} to {superType}"

Parameters:

superType - the class must be validated against, not null.

type - the class to check, not null.

Throws:

IllegalArgumentException - if type argument is not assignable to the specified superType.

Since:

3.0

See Also:

• isAssignableFrom(Class, Class, String, Object...)

isAssignableFrom

public static void isAssignableFrom(Class<?> superType,
 Class<?> type,
 String message,
 Object... values)

Validates that the argument can be converted to the specified class, if not throws an exception.

This method is useful when validating if there will be no casting errors.

Validate.isAssignableFrom(SuperClass.class, object.getClass());

The message of the exception is "The validated object cannot be converted to the" followed by the name of the class and "class"

Parameters:

superType - the class must be validated against, not null.

type - the class to check, not null.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if argument cannot be converted to the specified class.

See Also:

• isAssignableFrom(Class, Class)

isInstanceOf

public static void isInstanceOf(Class<?> type,
 Object obj)

Validates that the argument is an instance of the specified class, if not throws an exception.

This method is useful when validating according to an arbitrary class

Validate.isInstanceOf(OkClass.class, object);

The message of the exception is "Expected type: {type}, actual: {obj_type}"

Parameters:

type - the class the object must be validated against, not null.

obj - the object to check, null throws an exception.

Throws:

IllegalArgumentException - if argument is not of specified class.

Since:

3.0

See Also:

• isInstanceOf(Class, Object, String, Object...)

isInstanceOf

public static void isInstanceOf(Class<?> type,
 Object obj,
 String message,
 Object... values)

Validate that the argument is an instance of the specified class; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary class

Validate.isInstanceOf(OkClass.class, object, "Wrong class, object is of class %s",
  object.getClass().getName());

Parameters:

type - the class the object must be validated against, not null.

obj - the object to check, null throws an exception.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if argument is not of specified class.

Since:

3.0

See Also:

• isInstanceOf(Class, Object)

isTrue

public static void isTrue(boolean expression)

Validate that the argument condition is true; otherwise throwing an exception. 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.

Validate.isTrue(i > 0);
Validate.isTrue(myObject.isOk());

The message of the exception is "The validated expression is false".

Parameters:

expression - the boolean expression to check.

Throws:

IllegalArgumentException - if expression is false.

See Also:

• isTrue(boolean, String, long)
• isTrue(boolean, String, double)
• isTrue(boolean, String, Object...)
• isTrue(boolean, Supplier)

isTrue

public static void isTrue(boolean expression,
 String message,
 double value)

Validate 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.

Validate.isTrue(d > 0.0, "The value must be greater than zero: %s", d);

For performance reasons, the double value is passed as a separate parameter and appended to the exception message only in the case of an error.

Parameters:

expression - the boolean expression to check.

message - the String.format(String, Object...) exception message if invalid, not null.

value - the value to append to the message when invalid.

Throws:

IllegalArgumentException - if expression is false.

See Also:

• isTrue(boolean)
• isTrue(boolean, String, long)
• isTrue(boolean, String, Object...)
• isTrue(boolean, Supplier)

isTrue

public static void isTrue(boolean expression,
 String message,
 long value)

Validate 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.

Validate.isTrue(i > 0.0, "The value must be greater than zero: %d", i);

For performance reasons, the long value is passed as a separate parameter and appended to the exception message only in the case of an error.

Parameters:

expression - the boolean expression to check.

message - the String.format(String, Object...) exception message if invalid, not null.

value - the value to append to the message when invalid.

Throws:

IllegalArgumentException - if expression is false.

See Also:

• isTrue(boolean)
• isTrue(boolean, String, double)
• isTrue(boolean, String, Object...)
• isTrue(boolean, Supplier)

isTrue

public static void isTrue(boolean expression,
 String message,
 Object... values)

Validate 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.

Validate.isTrue(i >= min &amp;&amp; i <= max, "The value must be between %d and %d", min, max);

Parameters:

expression - the boolean expression to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if expression is false.

See Also:

• isTrue(boolean)
• isTrue(boolean, String, long)
• isTrue(boolean, String, double)
• isTrue(boolean, Supplier)

isTrue

public static void isTrue(boolean expression,
 Supplier<String> messageSupplier)

Validate 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.

Validate.isTrue(i >= min && i <= max, "The value must be between %d and %d", min, max);

Parameters:

expression - the boolean expression to check.

messageSupplier - the exception message supplier.

Throws:

IllegalArgumentException - if expression is false.

Since:

3.18.0

See Also:

• isTrue(boolean)
• isTrue(boolean, String, long)
• isTrue(boolean, String, double)

matchesPattern

public static void matchesPattern(CharSequence input,
 String pattern)

Validate that the specified argument character sequence matches the specified regular expression pattern; otherwise throwing an exception.

Validate.matchesPattern("hi", "[a-z]*");

The syntax of the pattern is the one used in the Pattern class.

Parameters:

input - the character sequence to validate, not null.

pattern - the regular expression pattern, not null.

Throws:

IllegalArgumentException - if the character sequence does not match the pattern.

Since:

3.0

See Also:

• matchesPattern(CharSequence, String, String, Object...)

matchesPattern

public static void matchesPattern(CharSequence input,
 String pattern,
 String message,
 Object... values)

Validate that the specified argument character sequence matches the specified regular expression pattern; otherwise throwing an exception with the specified message.

Validate.matchesPattern("hi", "[a-z]*", "%s does not match %s", "hi" "[a-z]*");

The syntax of the pattern is the one used in the Pattern class.

Parameters:

input - the character sequence to validate, not null.

pattern - the regular expression pattern, not null.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalArgumentException - if the character sequence does not match the pattern.

Since:

3.0

See Also:

• matchesPattern(CharSequence, String)

noNullElements

public static <T extends Iterable<?>> T noNullElements(T iterable)

Validate that the specified argument iterable is neither null nor contains any elements that are null; otherwise throwing an exception.

Validate.noNullElements(myCollection);

If the iterable is null, then the message in the exception is "The validated object is null".

If the array has a null element, then the message in the exception is "The validated iterable contains null element at index: " followed by the index.

Type Parameters:

T - the iterable type.

Parameters:

iterable - the iterable to check, validated not null by this method.

Returns:

the validated iterable (never null method for chaining).

Throws:

NullPointerException - if the array is null.

IllegalArgumentException - if an element is null.

See Also:

• noNullElements(Iterable, String, Object...)

noNullElements

public static <T extends Iterable<?>> T noNullElements(T iterable,
 String message,
 Object... values)

Validate that the specified argument iterable is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.

Validate.noNullElements(myCollection, "The collection contains null at position %d");

If the iterable is null, then the message in the exception is "The validated object is null".

If the iterable has a null element, then the iteration index of the invalid element is appended to the values argument.

Type Parameters:

T - the iterable type.

Parameters:

iterable - the iterable to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated iterable (never null method for chaining).

Throws:

NullPointerException - if the array is null.

IllegalArgumentException - if an element is null.

See Also:

• noNullElements(Iterable)

noNullElements

public static <T> T[] noNullElements(T[] array)

Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception.

Validate.noNullElements(myArray);

If the array is null, then the message in the exception is "The validated object is null".

If the array has a null element, then the message in the exception is "The validated array contains null element at index: " followed by the index.

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

Returns:

the validated array (never null method for chaining).

Throws:

NullPointerException - if the array is null.

IllegalArgumentException - if an element is null.

See Also:

• noNullElements(Object[], String, Object...)

noNullElements

public static <T> T[] noNullElements(T[] array,
 String message,
 Object... values)

Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.

Validate.noNullElements(myArray, "The array contain null at position %d");

If the array is null, then the message in the exception is "The validated object is null".

If the array has a null element, then the iteration index of the invalid element is appended to the values argument.

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated array (never null method for chaining).

Throws:

NullPointerException - if the array is null.

IllegalArgumentException - if an element is null.

See Also:

• noNullElements(Object[])

notBlank

public static <T extends CharSequence> T notBlank(T chars)

Validates that the specified argument character sequence is neither null, a length of zero (no characters), empty nor whitespace; otherwise throwing an exception.

Validate.notBlank(myString);

The message in the exception is "The validated character sequence is blank".

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

Returns:

the validated character sequence (never null method for chaining).

Throws:

NullPointerException - if the character sequence is null.

IllegalArgumentException - if the character sequence is blank.

Since:

3.0

See Also:

• notBlank(CharSequence, String, Object...)

notBlank

public static <T extends CharSequence> T notBlank(T chars,
 String message,
 Object... values)

Validates that the specified argument character sequence is not blank (whitespaces, empty ("") or null); otherwise throwing an exception with the specified message.

Validate.notBlank(myString, "The string must not be blank");

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated character sequence (never null method for chaining).

Throws:

NullPointerException - if the character sequence is null.

IllegalArgumentException - if the character sequence is blank.

Since:

3.0

See Also:

• notBlank(CharSequence)
• StringUtils.isBlank(CharSequence)

notEmpty

public static <T extends Collection<?>> T notEmpty(T collection)

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

Validate.notEmpty(myCollection);

The message in the exception is "The validated collection is empty".

Type Parameters:

T - the collection type.

Parameters:

collection - the collection to check, validated not null by this method.

Returns:

the validated collection (never null method for chaining).

Throws:

NullPointerException - if the collection is null.

IllegalArgumentException - if the collection is empty.

See Also:

• notEmpty(Collection, String, Object...)

notEmpty

public static <T extends Map<?,?>> T notEmpty(T map)

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

Validate.notEmpty(myMap);

The message in the exception is "The validated map is empty".

Type Parameters:

T - the map type.

Parameters:

map - the map to check, validated not null by this method.

Returns:

the validated map (never null method for chaining).

Throws:

NullPointerException - if the map is null.

IllegalArgumentException - if the map is empty.

See Also:

• notEmpty(Map, String, Object...)

notEmpty

public static <T extends CharSequence> T notEmpty(T chars)

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

Validate.notEmpty(myString);

The message in the exception is "The validated character sequence is empty".

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

Returns:

the validated character sequence (never null method for chaining).

Throws:

NullPointerException - if the character sequence is null.

IllegalArgumentException - if the character sequence is empty.

See Also:

• notEmpty(CharSequence, String, Object...)

notEmpty

public static <T extends Collection<?>> T notEmpty(T collection,
 String message,
 Object... values)

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

Validate.notEmpty(myCollection, "The collection must not be empty");

Type Parameters:

T - the collection type.

Parameters:

collection - the collection to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated collection (never null method for chaining).

Throws:

NullPointerException - if the collection is null.

IllegalArgumentException - if the collection is empty.

See Also:

• notEmpty(Object[])

notEmpty

public static <T extends Map<?,?>> T notEmpty(T map,
 String message,
 Object... values)

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

Validate.notEmpty(myMap, "The map must not be empty");

Type Parameters:

T - the map type.

Parameters:

map - the map to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated map (never null method for chaining).

Throws:

NullPointerException - if the map is null.

IllegalArgumentException - if the map is empty.

See Also:

• notEmpty(Object[])

notEmpty

public static <T extends CharSequence> T notEmpty(T chars,
 String message,
 Object... values)

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

Validate.notEmpty(myString, "The string must not be empty");

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated character sequence (never null method for chaining).

Throws:

NullPointerException - if the character sequence is null.

IllegalArgumentException - if the character sequence is empty.

See Also:

• notEmpty(CharSequence)

notEmpty

public static <T> T[] notEmpty(T[] array)

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

Validate.notEmpty(myArray);

The message in the exception is "The validated array is empty".

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

Returns:

the validated array (never null method for chaining).

Throws:

NullPointerException - if the array is null.

IllegalArgumentException - if the array is empty.

See Also:

• notEmpty(Object[], String, Object...)

notEmpty

public static <T> T[] notEmpty(T[] array,
 String message,
 Object... values)

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

Validate.notEmpty(myArray, "The array must not be empty");

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated array (never null method for chaining).

Throws:

NullPointerException - if the array is null

IllegalArgumentException - if the array is empty

See Also:

• notEmpty(Object[])

notNaN

public static void notNaN(double value)

Validates that the specified argument is not Not-a-Number (NaN); otherwise throwing an exception.

Validate.notNaN(myDouble);

The message of the exception is "The validated value is not a number".

Parameters:

value - the value to validate.

Throws:

IllegalArgumentException - if the value is not a number.

Since:

3.5

See Also:

• notNaN(double, String, Object...)

notNaN

public static void notNaN(double value,
 String message,
 Object... values)

Validates that the specified argument is not Not-a-Number (NaN); otherwise throwing an exception with the specified message.

Validate.notNaN(myDouble, "The value must be a number");

Parameters:

value - the value to validate.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message.

Throws:

IllegalArgumentException - if the value is not a number.

Since:

3.5

See Also:

• notNaN(double)

notNull

@Deprecated
public static <T> T notNull(T object)

Deprecated.

Use Objects.requireNonNull(Object).

Validate that the specified argument is not null; otherwise throwing an exception.

Validate.notNull(myObject, "The object must not be null");

The message of the exception is "The validated object is null".

Type Parameters:

T - the object type.

Parameters:

object - the object to check.

Returns:

the validated object (never null for method chaining).

Throws:

NullPointerException - if the object is null.

See Also:

• notNull(Object, String, Object...)

notNull

public static <T> T notNull(T object,
 String message,
 Object... values)

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

Validate.notNull(myObject, "The object must not be null");

Type Parameters:

T - the object type.

Parameters:

object - the object to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message.

Returns:

the validated object (never null for method chaining).

Throws:

NullPointerException - if the object is null.

See Also:

• Objects.requireNonNull(Object)

validIndex

public static <T extends Collection<?>> T validIndex(T collection,
 int index)

Validates that the index is within the bounds of the argument collection; otherwise throwing an exception.

Validate.validIndex(myCollection, 2);

If the index is invalid, then the message of the exception is "The validated collection index is invalid: " followed by the index.

Type Parameters:

T - the collection type.

Parameters:

collection - the collection to check, validated not null by this method.

index - the index to check.

Returns:

the validated collection (never null for method chaining).

Throws:

NullPointerException - if the collection is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(Collection, int, String, Object...)

validIndex

public static <T extends CharSequence> T validIndex(T chars,
 int index)

Validates that the index is within the bounds of the argument character sequence; otherwise throwing an exception.

Validate.validIndex(myStr, 2);

If the character sequence is null, then the message of the exception is "The validated object is null".

If the index is invalid, then the message of the exception is "The validated character sequence index is invalid: " followed by the index.

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

index - the index to check.

Returns:

the validated character sequence (never null for method chaining).

Throws:

NullPointerException - if the character sequence is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(CharSequence, int, String, Object...)

validIndex

public static <T extends Collection<?>> T validIndex(T collection,
 int index,
 String message,
 Object... values)

Validates that the index is within the bounds of the argument collection; otherwise throwing an exception with the specified message.

Validate.validIndex(myCollection, 2, "The collection index is invalid: ");

If the collection is null, then the message of the exception is "The validated object is null".

Type Parameters:

T - the collection type.

Parameters:

collection - the collection to check, validated not null by this method.

index - the index to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated collection (never null for chaining).

Throws:

NullPointerException - if the collection is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(Collection, int)

validIndex

public static <T extends CharSequence> T validIndex(T chars,
 int index,
 String message,
 Object... values)

Validates that the index is within the bounds of the argument character sequence; otherwise throwing an exception with the specified message.

Validate.validIndex(myStr, 2, "The string index is invalid: ");

If the character sequence is null, then the message of the exception is "The validated object is null".

Type Parameters:

T - the character sequence type.

Parameters:

chars - the character sequence to check, validated not null by this method.

index - the index to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated character sequence (never null for method chaining).

Throws:

NullPointerException - if the character sequence is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(CharSequence, int)

validIndex

public static <T> T[] validIndex(T[] array,
 int index)

Validates that the index is within the bounds of the argument array; otherwise throwing an exception.

Validate.validIndex(myArray, 2);

If the array is null, then the message of the exception is "The validated object is null".

If the index is invalid, then the message of the exception is "The validated array index is invalid: " followed by the index.

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

index - the index to check.

Returns:

the validated array (never null for method chaining).

Throws:

NullPointerException - if the array is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(Object[], int, String, Object...)

validIndex

public static <T> T[] validIndex(T[] array,
 int index,
 String message,
 Object... values)

Validates that the index is within the bounds of the argument array; otherwise throwing an exception with the specified message.

Validate.validIndex(myArray, 2, "The array index is invalid: ");

If the array is null, then the message of the exception is "The validated object is null".

Type Parameters:

T - the array type.

Parameters:

array - the array to check, validated not null by this method.

index - the index to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Returns:

the validated array (never null for method chaining).

Throws:

NullPointerException - if the array is null.

IndexOutOfBoundsException - if the index is invalid.

Since:

3.0

See Also:

• validIndex(Object[], int)

validState

public static void validState(boolean expression)

Validate that the stateful condition is true; otherwise throwing an exception. 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.

Validate.validState(field > 0);
Validate.validState(this.isOk());

The message of the exception is "The validated state is false".

Parameters:

expression - the boolean expression to check.

Throws:

IllegalStateException - if expression is false.

Since:

3.0

See Also:

• validState(boolean, String, Object...)

validState

public static void validState(boolean expression,
 String message,
 Object... values)

Validate that the stateful 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.

Validate.validState(this.isOk(), "The state is not OK: %s", myObject);

Parameters:

expression - the boolean expression to check.

message - the String.format(String, Object...) exception message if invalid, not null.

values - the optional values for the formatted exception message, null array not recommended.

Throws:

IllegalStateException - if expression is false.

Since:

3.0

See Also:

• validState(boolean)