org.goda.time.field

Class FieldUtils

java.lang.Object

org.goda.time.field.FieldUtils

public class FieldUtils
extends Object

General utilities that don't fit elsewhere.

FieldUtils is thread-safe and immutable.

Since:

1.0

Author:

Stephen Colebourne

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	equals(Object object1, Object object2) Compares two objects as equals handling null.
static int	getWrappedValue(int value, int minValue, int maxValue) Utility method that ensures the given value lies within the field's legal value range.
static int	getWrappedValue(int currentValue, int wrapValue, int minValue, int maxValue) Utility method used by addWrapField implementations to ensure the new value lies within the field's legal value range.
static int	safeAdd(int val1, int val2) Add two values throwing an exception if overflow occurs.
static long	safeAdd(long val1, long val2) Add two values throwing an exception if overflow occurs.
static int	safeMultiply(int val1, int val2) Multiply two values throwing an exception if overflow occurs.
static long	safeMultiply(long val1, int scalar) Multiply two values throwing an exception if overflow occurs.
static long	safeMultiply(long val1, long val2) Multiply two values throwing an exception if overflow occurs.
static int	safeMultiplyToInt(long val1, long val2) Multiply two values to return an int throwing an exception if overflow occurs.
static int	safeNegate(int value) Negates the input throwing an exception if it can't negate it.
static long	safeSubtract(long val1, long val2) Subtracts two values throwing an exception if overflow occurs.
static int	safeToInt(long value) Casts to an int throwing an exception if overflow occurs.
static void	verifyValueBounds(DateTimeField field, int value, int lowerBound, int upperBound) Verify that input values are within specified bounds.
static void	verifyValueBounds(DateTimeFieldType fieldType, int value, int lowerBound, int upperBound) Verify that input values are within specified bounds.
static void	verifyValueBounds(String fieldName, int value, int lowerBound, int upperBound) Verify that input values are within specified bounds.

Methods inherited from class java.lang.Object

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

Method Detail

safeNegate

public static int safeNegate(int value)

Negates the input throwing an exception if it can't negate it.

Parameters:

value - the value to negate

Returns:

the negated value

Throws:

ArithmeticException - if the value is Integer.MIN_VALUE

Since:

1.1

safeAdd

public static int safeAdd(int val1,
          int val2)

Add two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value

val2 - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

safeAdd

public static long safeAdd(long val1,
           long val2)

Add two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value

val2 - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

safeSubtract

public static long safeSubtract(long val1,
                long val2)

Subtracts two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value, to be taken away from

val2 - the second value, the amount to take away

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

safeMultiply

public static int safeMultiply(int val1,
               int val2)

Multiply two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value

val2 - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

Since:

1.2

safeMultiply

public static long safeMultiply(long val1,
                int scalar)

Multiply two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value

scalar - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

Since:

1.2

safeMultiply

public static long safeMultiply(long val1,
                long val2)

Multiply two values throwing an exception if overflow occurs.

Parameters:

val1 - the first value

val2 - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

safeToInt

public static int safeToInt(long value)

Casts to an int throwing an exception if overflow occurs.

Parameters:

value - the value

Returns:

the value as an int

Throws:

ArithmeticException - if the value is too big or too small

safeMultiplyToInt

public static int safeMultiplyToInt(long val1,
                    long val2)

Multiply two values to return an int throwing an exception if overflow occurs.

Parameters:

val1 - the first value

val2 - the second value

Returns:

the new total

Throws:

ArithmeticException - if the value is too big or too small

verifyValueBounds

public static void verifyValueBounds(DateTimeField field,
                     int value,
                     int lowerBound,
                     int upperBound)

Verify that input values are within specified bounds.

Parameters:

value - the value to check

lowerBound - the lower bound allowed for value

upperBound - the upper bound allowed for value

Throws:

IllegalFieldValueException - if value is not in the specified bounds

verifyValueBounds

public static void verifyValueBounds(DateTimeFieldType fieldType,
                     int value,
                     int lowerBound,
                     int upperBound)

Verify that input values are within specified bounds.

Parameters:

value - the value to check

lowerBound - the lower bound allowed for value

upperBound - the upper bound allowed for value

Throws:

IllegalFieldValueException - if value is not in the specified bounds

Since:

1.1

verifyValueBounds

public static void verifyValueBounds(String fieldName,
                     int value,
                     int lowerBound,
                     int upperBound)

Verify that input values are within specified bounds.

Parameters:

value - the value to check

lowerBound - the lower bound allowed for value

upperBound - the upper bound allowed for value

Throws:

IllegalFieldValueException - if value is not in the specified bounds

getWrappedValue

public static int getWrappedValue(int currentValue,
                  int wrapValue,
                  int minValue,
                  int maxValue)

Utility method used by addWrapField implementations to ensure the new value lies within the field's legal value range.

Parameters:

currentValue - the current value of the data, which may lie outside the wrapped value range

wrapValue - the value to add to current value before wrapping. This may be negative.

minValue - the wrap range minimum value.

maxValue - the wrap range maximum value. This must be greater than minValue (checked by the method).

Returns:

the wrapped value

Throws:

IllegalArgumentException - if minValue is greater than or equal to maxValue

getWrappedValue

public static int getWrappedValue(int value,
                  int minValue,
                  int maxValue)

Utility method that ensures the given value lies within the field's legal value range.

Parameters:

value - the value to fit into the wrapped value range

minValue - the wrap range minimum value.

maxValue - the wrap range maximum value. This must be greater than minValue (checked by the method).

Returns:

the wrapped value

Throws:

IllegalArgumentException - if minValue is greater than or equal to maxValue

equals

public static boolean equals(Object object1,
             Object object2)

Compares two objects as equals handling null.

Parameters:

object1 - the first object

object2 - the second object

Returns:

true if equal

Since:

1.4