Package org.apache.wicket.util.lang

Class Bytes

java.lang.Object

org.apache.wicket.util.value.LongValue

org.apache.wicket.util.lang.Bytes

All Implemented Interfaces:

Serializable, Comparable<LongValue>

public final class Bytes
extends LongValue

Represents an immutable byte count. These static factory methods allow easy construction of value objects using either long values like bytes(2034) or megabytes(3):

• Bytes.bytes(long)
• Bytes.kilobytes(long)
• Bytes.megabytes(long)
• Bytes.gigabytes(long)
• Bytes.terabytes(long)

or double precision floating point values like megabytes(3.2):

• Bytes.bytes(double)
• Bytes.kilobytes(double)
• Bytes.megabytes(double)
• Bytes.gigabytes(double)
• Bytes.terabytes(double)

In the case of bytes(double), the value will be rounded off to the nearest integer byte count using Math.round().

The precise number of bytes in a Bytes object can be retrieved by calling bytes(). Approximate values for different units can be retrieved as double precision values using these methods:

• kilobytes()
• megabytes()
• gigabytes()
• terabytes()

Also, value objects can be constructed from strings, optionally using a Locale with valueOf(String) and valueOf(String,Locale). The string may contain a decimal or floating point number followed by optional whitespace followed by a unit (nothing for bytes, K for kilobyte, M for megabytes, G for gigabytes or T for terabytes) optionally followed by a B (for bytes). Any of these letters can be any case. So, examples of permissible string values are:

• 37 (37 bytes)
• 2.3K (2.3 kilobytes)
• 2.5 kb (2.5 kilobytes)
• 4k (4 kilobytes)
• 35.2GB (35.2 gigabytes)
• 1024M (1024 megabytes)

Note that if the Locale was not US, the values might substitute "," for "." as that is the custom in Euroland.

The toString() and toString(Locale) methods are smart enough to convert a given value object to the most appropriate units for the given value.

Author:

Jonathan Locke

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static Bytes	MAX	Maximum bytes value

Fields inherited from class org.apache.wicket.util.value.LongValue

value

Method Summary

Modifier and Type	Method	Description
long	bytes()	Gets the byte count represented by this value object.
static Bytes	bytes(double bytes)	Instantiate immutable Bytes value object..
static Bytes	bytes(long bytes)	Instantiate immutable Bytes value object..
double	gigabytes()	Gets the byte count in gigabytes.
static Bytes	gigabytes(double gigabytes)	Instantiate immutable Bytes value object..
static Bytes	gigabytes(long gigabytes)	Instantiate immutable Bytes value object..
boolean	greaterThan(Bytes other)	Compares this Bytes with another Bytes instance.
double	kilobytes()	Gets the byte count in kilobytes.
static Bytes	kilobytes(double kilobytes)	Instantiate immutable Bytes value object..
static Bytes	kilobytes(long kilobytes)	Instantiate immutable Bytes value object..
double	megabytes()	Gets the byte count in megabytes.
static Bytes	megabytes(double megabytes)	Instantiate immutable Bytes value object..
static Bytes	megabytes(long megabytes)	Instantiate immutable Bytes value object..
double	terabytes()	Gets the byte count in terabytes.
static Bytes	terabytes(double terabytes)	Instantiate immutable Bytes value object..
static Bytes	terabytes(long terabytes)	Instantiate immutable Bytes value object..
String	toString()	Converts this byte count to a string using the default locale.
String	toString(Locale locale)	Converts this byte count to a string using the given locale.
static Bytes	valueOf(String string)	Converts a string to a number of bytes.
static Bytes	valueOf(String string, Locale locale)	Converts a string to a number of bytes.

Methods inherited from class org.apache.wicket.util.value.LongValue

compareTo, equals, greaterThan, greaterThan, greaterThanOrEqual, greaterThanOrEqual, hashCode, lessThan, lessThan, lessThanOrEqual, lessThanOrEqual, max, maxNullSafe, min

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

MAX

public static final Bytes MAX

Maximum bytes value

Method Detail

bytes

public static Bytes bytes(long bytes)

Instantiate immutable Bytes value object..

Parameters:

bytes - Value to convert

Returns:

Input as Bytes

kilobytes

public static Bytes kilobytes(long kilobytes)

Instantiate immutable Bytes value object..

Parameters:

kilobytes - Value to convert

Returns:

Input as Bytes

megabytes

public static Bytes megabytes(long megabytes)

Instantiate immutable Bytes value object..

Parameters:

megabytes - Value to convert

Returns:

Input as Bytes

gigabytes

public static Bytes gigabytes(long gigabytes)

Instantiate immutable Bytes value object..

Parameters:

gigabytes - Value to convert

Returns:

Input as Bytes

terabytes

public static Bytes terabytes(long terabytes)

Instantiate immutable Bytes value object..

Parameters:

terabytes - Value to convert

Returns:

Input as Bytes

bytes

public static Bytes bytes(double bytes)

Instantiate immutable Bytes value object..

Parameters:

bytes - Value to convert

Returns:

Input as Bytes

kilobytes

public static Bytes kilobytes(double kilobytes)

Instantiate immutable Bytes value object..

Parameters:

kilobytes - Value to convert

Returns:

Input as Bytes

megabytes

public static Bytes megabytes(double megabytes)

Instantiate immutable Bytes value object..

Parameters:

megabytes - Value to convert

Returns:

Input as Bytes

gigabytes

public static Bytes gigabytes(double gigabytes)

Instantiate immutable Bytes value object..

Parameters:

gigabytes - Value to convert

Returns:

Input as Bytes

terabytes

public static Bytes terabytes(double terabytes)

Instantiate immutable Bytes value object..

Parameters:

terabytes - Value to convert

Returns:

Input as Bytes

bytes

public final long bytes()

Gets the byte count represented by this value object.

Returns:

Byte count

kilobytes

public final double kilobytes()

Gets the byte count in kilobytes.

Returns:

The value in kilobytes

megabytes

public final double megabytes()

Gets the byte count in megabytes.

Returns:

The value in megabytes

gigabytes

public final double gigabytes()

Gets the byte count in gigabytes.

Returns:

The value in gigabytes

terabytes

public final double terabytes()

Gets the byte count in terabytes.

Returns:

The value in terabytes

valueOf

public static Bytes valueOf(String string,
                            Locale locale)
                     throws StringValueConversionException

Converts a string to a number of bytes. Strings consist of a floating point value followed by K, M, G or T for kilobytes, megabytes, gigabytes or terabytes, respectively. The abbreviations KB, MB, GB and TB are also accepted. Matching is case insensitive.

Parameters:

string - The string to convert

locale - The Locale to be used for transformation

Returns:

The Bytes value for the string

Throws:

StringValueConversionException

valueOf

public static Bytes valueOf(String string)
                     throws StringValueConversionException

Converts a string to a number of bytes. Strings consist of a floating point value followed by K, M, G or T for kilobytes, megabytes, gigabytes or terabytes, respectively. The abbreviations KB, MB, GB and TB are also accepted. Matching is case insensitive.

Parameters:

string - The string to convert

Returns:

The Bytes value for the string

Throws:

StringValueConversionException

toString

public String toString()

Converts this byte count to a string using the default locale.

Overrides:

toString in class LongValue

Returns:

The string for this byte count

toString

public String toString(Locale locale)

Converts this byte count to a string using the given locale.

Parameters:

locale - Locale to use for conversion

Returns:

The string for this byte count

greaterThan

public boolean greaterThan(Bytes other)

Compares this Bytes with another Bytes instance.

Parameters:

other - the Bytes instance to compare with

Returns:

true if this Bytes is greater than the given Bytes instance