Package org.drasyl.util
Class Preconditions
- java.lang.Object
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- org.drasyl.util.Preconditions
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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.
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Field Summary
Fields Modifier and Type Field Description static String
MUST_BE_NON_NEGATIVE
static String
MUST_BE_POSITIVE
static String
MUST_BE_POWER_OF_TWO
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Method Summary
All Methods Static Methods Concrete Methods 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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
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 customizedIllegalArgumentException
if it is not.
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Field Detail
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MUST_BE_NON_NEGATIVE
public static final String MUST_BE_NON_NEGATIVE
- See Also:
- Constant Field Values
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MUST_BE_POSITIVE
public static final String MUST_BE_POSITIVE
- See Also:
- Constant Field Values
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MUST_BE_POWER_OF_TWO
public static final String MUST_BE_POWER_OF_TWO
- See Also:
- Constant Field Values
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Method Detail
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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
- ifobj
is negative
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requireNonNegative
public static byte requireNonNegative(byte obj, String message)
Checks that the specified number is non-negative and throws a customizedIllegalArgumentException
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 negativitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if non-negative- Throws:
IllegalArgumentException
- ifobj
is negative
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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
- ifobj
is negative
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requireNonNegative
public static int requireNonNegative(int obj, String message)
Checks that the specified number is non-negative and throws a customizedIllegalArgumentException
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 negativitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if non-negative- Throws:
IllegalArgumentException
- ifobj
is negative
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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
- ifobj
is negative
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requireNonNegative
public static long requireNonNegative(long obj, String message)
Checks that the specified number is non-negative and throws a customizedIllegalArgumentException
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 negativitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if non-negative- Throws:
IllegalArgumentException
- ifobj
is negative
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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
- ifobj
is negative
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requireNonNegative
public static short requireNonNegative(short obj, String message)
Checks that the specified number is non-negative and throws a customizedIllegalArgumentException
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 negativitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if non-negative- Throws:
IllegalArgumentException
- ifobj
is negative
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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
- ifobj
is negative
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requirePositive
public static byte requirePositive(byte obj, String message)
Checks that the specified number is positive and throws a customizedIllegalArgumentException
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 positivitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if positive- Throws:
IllegalArgumentException
- ifobj
is not positive
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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
- ifobj
is negative
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requirePositive
public static int requirePositive(int obj, String message)
Checks that the specified number is positive and throws a customizedIllegalArgumentException
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 positivitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if positive- Throws:
IllegalArgumentException
- ifobj
is not positive
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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
- ifobj
is negative
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requirePositive
public static long requirePositive(long obj, String message)
Checks that the specified number is positive and throws a customizedIllegalArgumentException
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 positivitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if positive- Throws:
IllegalArgumentException
- ifobj
is not positive
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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
- ifobj
is not positive
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requirePositive
public static short requirePositive(short obj, String message)
Checks that the specified number is positive and throws a customizedIllegalArgumentException
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 positivitymessage
- detail message to be used in the event that aIllegalArgumentException
is thrown- Returns:
obj
if positive- Throws:
IllegalArgumentException
- ifobj
is not positive
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