org.apache.commons.lang
Class CharRange

java.lang.Object
  org.apache.commons.lang.CharRange

All Implemented Interfaces:

Serializable

public final class CharRange
extends Object
implements Serializable

A contiguous range of characters, optionally negated.

Instances are immutable.

Since:

1.0

Version:

$Id: CharRange.java 471626 2006-11-06 04:02:09Z bayard $

Author:

Stephen Colebourne, Chris Feldhacker, Gary Gregory

See Also:

Serialized Form

Constructor Summary

CharRange(char ch)
Constructs a CharRange over a single character.

CharRange(char ch, boolean negated)
Constructs a CharRange over a single character, optionally negating the range.

CharRange(char start, char end)
Constructs a CharRange over a set of characters.

CharRange(char start, char end, boolean negated)
Constructs a CharRange over a set of characters, optionally negating the range.

Method Summary

boolean	contains(char ch) Is the character specified contained in this range.
boolean	contains(CharRange range) Are all the characters of the passed in range contained in this range.
boolean	equals(Object obj) Compares two CharRange objects, returning true if they represent exactly the same range of characters defined in the same way.
char	getEnd() Gets the end character for this character range.
char	getStart() Gets the start character for this character range.
int	hashCode() Gets a hashCode compatible with the equals method.
boolean	isNegated() Is this CharRange negated.
String	toString() Gets a string representation of the character range.

Methods inherited from class java.lang.Object

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

Constructor Detail

CharRange

public CharRange(char ch)

Constructs a CharRange over a single character.

Parameters:

ch - only character in this range

CharRange

public CharRange(char ch,
                 boolean negated)

Constructs a CharRange over a single character, optionally negating the range.

A negated range includes everything except the specified char.

Parameters:

ch - only character in this range

negated - true to express everything except the range

CharRange

public CharRange(char start,
                 char end)

Constructs a CharRange over a set of characters.

Parameters:

start - first character, inclusive, in this range

end - last character, inclusive, in this range

CharRange

public CharRange(char start,
                 char end,
                 boolean negated)

Constructs a CharRange over a set of characters, optionally negating the range.

A negated range includes everything except that defined by the start and end characters.

If start and end are in the wrong order, they are reversed. Thus a-e is the same as e-a.

Parameters:

start - first character, inclusive, in this range

end - last character, inclusive, in this range

negated - true to express everything except the range

Method Detail

getStart

public char getStart()

Gets the start character for this character range.

Returns:

the start char (inclusive)

getEnd

public char getEnd()

Gets the end character for this character range.

Returns:

the end char (inclusive)

isNegated

public boolean isNegated()

Is this CharRange negated.

A negated range includes everything except that defined by the start and end characters.

Returns:

true is negated

contains

public boolean contains(char ch)

Is the character specified contained in this range.

Parameters:

ch - the character to check

Returns:

true if this range contains the input character

contains

public boolean contains(CharRange range)

Are all the characters of the passed in range contained in this range.

Parameters:

range - the range to check against

Returns:

true if this range entirely contains the input range

Throws:

IllegalArgumentException - if null input

equals

public boolean equals(Object obj)

Compares two CharRange objects, returning true if they represent exactly the same range of characters defined in the same way.

Overrides:

equals in class Object

Parameters:

obj - the object to compare to

Returns:

true if equal

hashCode

public int hashCode()

Gets a hashCode compatible with the equals method.

Overrides:

hashCode in class Object

Returns:

a suitable hashCode

toString

public String toString()

Gets a string representation of the character range.

Overrides:

toString in class Object

Returns:

string representation of this range