Package org.drasyl.util

Class Preconditions

java.lang.Object

org.drasyl.util.Preconditions

public final class Preconditions
extends Object

Static convenience methods that help a method or constructor check whether it was invoked correctly (that is, whether its preconditions were met).

If the precondition is not met, the Preconditions method throws an unchecked exception of a specified type, which helps the method in which the exception was thrown communicate that its caller has made a mistake.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	MUST_BE_NON_NEGATIVE
static final String	MUST_BE_POSITIVE
static final String	MUST_BE_POWER_OF_TWO

Method Summary

Modifier and Type	Method	Description
static byte	requireNonNegative(byte obj)	Checks that the specified number is non-negative.
static byte	requireNonNegative(byte obj, String message)	Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not.
static int	requireNonNegative(int obj)	Checks that the specified number is non-negative.
static int	requireNonNegative(int obj, String message)	Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not.
static long	requireNonNegative(long obj)	Checks that the specified number is non-negative.
static long	requireNonNegative(long obj, String message)	Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not.
static short	requireNonNegative(short obj)	Checks that the specified number is non-negative.
static short	requireNonNegative(short obj, String message)	Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not.
static byte	requirePositive(byte obj)	Checks that the specified number is positive.
static byte	requirePositive(byte obj, String message)	Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not.
static int	requirePositive(int obj)	Checks that the specified number is positive.
static int	requirePositive(int obj, String message)	Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not.
static long	requirePositive(long obj)	Checks that the specified number is positive.
static long	requirePositive(long obj, String message)	Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not.
static short	requirePositive(short obj)	Checks that the specified number is positive.
static short	requirePositive(short obj, String message)	Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not.

Methods inherited from class java.lang.Object

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

Field Details

MUST_BE_NON_NEGATIVE

public static final String MUST_BE_NON_NEGATIVE

See Also:

• Constant Field Values

MUST_BE_POSITIVE

public static final String MUST_BE_POSITIVE

See Also:

• Constant Field Values

MUST_BE_POWER_OF_TWO

public static final String MUST_BE_POWER_OF_TWO

See Also:

• Constant Field Values

Method Details

requireNonNegative

public static byte requireNonNegative(byte obj)

Checks that the specified number is non-negative. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static byte requireNonNegative(byte obj,
 String message)

Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar, "bar must be non-negative");
 }
 

Parameters:

obj - the number to check for negativity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static int requireNonNegative(int obj)

Checks that the specified number is non-negative. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static int requireNonNegative(int obj,
 String message)

Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar, "bar must be non-negative");
 }
 

Parameters:

obj - the number to check for negativity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static long requireNonNegative(long obj)

Checks that the specified number is non-negative. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static long requireNonNegative(long obj,
 String message)

Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar, "bar must be non-negative");
 }
 

Parameters:

obj - the number to check for negativity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static short requireNonNegative(short obj)

Checks that the specified number is non-negative. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requireNonNegative

public static short requireNonNegative(short obj,
 String message)

Checks that the specified number is non-negative and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requireNonNegative(bar, "bar must be non-negative");
 }
 

Parameters:

obj - the number to check for negativity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requirePositive

public static byte requirePositive(byte obj)

Checks that the specified number is positive. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requirePositive

public static byte requirePositive(byte obj,
 String message)

Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar, "bar must be positive");
 }
 

Parameters:

obj - the number to check for positivity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if positive

Throws:

IllegalArgumentException - if obj is not positive

requirePositive

public static int requirePositive(int obj)

Checks that the specified number is positive. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requirePositive

public static int requirePositive(int obj,
 String message)

Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar, "bar must be positive");
 }
 

Parameters:

obj - the number to check for positivity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if positive

Throws:

IllegalArgumentException - if obj is not positive

requirePositive

public static long requirePositive(long obj)

Checks that the specified number is positive. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar);
 }
 

Parameters:

obj - the number to check for negativity

Returns:

obj if non-negative

Throws:

IllegalArgumentException - if obj is negative

requirePositive

public static long requirePositive(long obj,
 String message)

Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar, "bar must be positive");
 }
 

Parameters:

obj - the number to check for positivity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if positive

Throws:

IllegalArgumentException - if obj is not positive

requirePositive

public static short requirePositive(short obj)

Checks that the specified number is positive. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar);
 }
 

Parameters:

obj - the number to check for positivity

Returns:

obj if positive

Throws:

IllegalArgumentException - if obj is not positive

requirePositive

public static short requirePositive(short obj,
 String message)

Checks that the specified number is positive and throws a customized IllegalArgumentException if it is not. This method is designed primarily for doing parameter validation in methods and constructors, as demonstrated below:

 public Foo(int bar) {
     this.bar = Preconditions.requirePositive(bar, "bar must be positive");
 }
 

Parameters:

obj - the number to check for positivity

message - detail message to be used in the event that a IllegalArgumentException is thrown

Returns:

obj if positive

Throws:

IllegalArgumentException - if obj is not positive