org.apache.commons.lang3

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 and Description
Validate() Constructor.

Method Summary

Modifier and Type	Method and 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 NaN; otherwise throwing an exception.
static void	finite(double value, String message, Object... values) Validates that the specified argument is not infinite or 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	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) Validate 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) Validate that the specified argument character sequence is neither null, a length of zero (no characters), empty nor whitespace; otherwise throwing an exception with the specified message.
static <T extends CharSequence> T	notEmpty(T chars) 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) Validate 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) Validate 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) Validate 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) Validate 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) Validate 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 NaN; otherwise throwing an exception.
static void	notNaN(double value, String message, Object... values) Validates that the specified argument is not NaN; otherwise throwing an exception with the specified message.
static <T> T	notNull(T object) Validate that the specified argument is not null; otherwise throwing an exception.
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 java.lang.Object

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

Constructor Detail

Validate

public Validate()

Constructor. This class should not normally be instantiated.

Method Detail

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

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

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 && i <= max, "The value must be between %d and %d", min, max);
 Validate.isTrue(myObject.isOk(), "The object is not okay");

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

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...)

notNull

public static <T> T notNull(T 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:

notNull(Object)

notEmpty

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

Validate 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[])

notEmpty

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

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

Validate 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 Collection<?>> T notEmpty(T collection)

Validate 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,
                                              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 Map<?,?>> T notEmpty(T map)

Validate 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,
                                                  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 extends CharSequence> T notEmpty(T chars)

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 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...)

notBlank

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

Validate that the specified argument character sequence is neither null, a length of zero (no characters), empty nor whitespace; 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)

notBlank

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

Validate 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...)

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[])

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 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 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...)

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)

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 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 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,
                                                    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 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...)

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)

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)

notNaN

public static void notNaN(double value)

Validates that the specified argument is not 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, java.lang.String, java.lang.Object...)

notNaN

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

Validates that the specified argument is not 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)

finite

public static void finite(double value)

Validates that the specified argument is not infinite or 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 NaN

Since:

3.5

See Also:

finite(double, java.lang.String, java.lang.Object...)

finite

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

Validates that the specified argument is not infinite or 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 NaN

Since:

3.5

See Also:

finite(double)

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)

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 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

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)

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 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

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)

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 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 can not be converted to the" followed by the name of the class and "class"

Parameters:

superType - the class 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 can not be converted to the specified class

See Also:

isAssignableFrom(Class, Class)