org.jboss.gravia.resource

Class VersionRange

java.lang.Object

org.jboss.gravia.resource.VersionRange

public class VersionRange
extends Object

Version range. A version range is an interval describing a set of versions.

A range has a left (lower) endpoint and a right (upper) endpoint. Each endpoint can be open (excluded from the set) or closed (included in the set).

VersionRange objects are immutable.

Field Summary

Fields

Modifier and Type	Field and Description
static char	LEFT_CLOSED The left endpoint is closed and is included in the range.
static char	LEFT_OPEN The left endpoint is open and is excluded from the range.
static char	RIGHT_CLOSED The right endpoint is closed and is included in the range.
static char	RIGHT_OPEN The right endpoint is open and is excluded from the range.

Constructor Summary

Constructors

Constructor and Description
VersionRange(char leftType, Version leftEndpoint, Version rightEndpoint, char rightType) Creates a version range from the specified versions.
VersionRange(String range) Creates a version range from the specified string.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object object) Compares this VersionRange object to another object.
Version	getLeft() Returns the left endpoint of this version range.
char	getLeftType() Returns the type of the left endpoint of this version range.
Version	getRight() Returns the right endpoint of this version range.
char	getRightType() Returns the type of the right endpoint of this version range.
int	hashCode() Returns a hash code value for the object.
boolean	includes(Version version) Returns whether this version range includes the specified version.
VersionRange	intersection(VersionRange... ranges) Returns the intersection of this version range with the specified version ranges.
boolean	isEmpty() Returns whether this version range is empty.
boolean	isExact() Returns whether this version range contains only a single version.
String	toFilterString(String attributeName) Returns the filter string for this version range using the specified attribute name.
String	toString() Returns the string representation of this version range.

Methods inherited from class java.lang.Object

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

Field Detail

LEFT_OPEN

public static final char LEFT_OPEN

The left endpoint is open and is excluded from the range.

The value of LEFT_OPEN is '('.

See Also:

Constant Field Values

LEFT_CLOSED

public static final char LEFT_CLOSED

The left endpoint is closed and is included in the range.

The value of LEFT_CLOSED is '['.

See Also:

Constant Field Values

RIGHT_OPEN

public static final char RIGHT_OPEN

The right endpoint is open and is excluded from the range.

The value of RIGHT_OPEN is ')'.

See Also:

Constant Field Values

RIGHT_CLOSED

public static final char RIGHT_CLOSED

The right endpoint is closed and is included in the range.

The value of RIGHT_CLOSED is ']'.

See Also:

Constant Field Values

Constructor Detail

VersionRange

public VersionRange(char leftType,
            Version leftEndpoint,
            Version rightEndpoint,
            char rightType)

Creates a version range from the specified versions.

Parameters:

leftType - Must be either LEFT_CLOSED or LEFT_OPEN .

leftEndpoint - Left endpoint of range. Must not be null.

rightEndpoint - Right endpoint of range. May be null to indicate the right endpoint is Infinity.

rightType - Must be either RIGHT_CLOSED or RIGHT_OPEN.

Throws:

IllegalArgumentException - If the arguments are invalid.

VersionRange

public VersionRange(String range)

Creates a version range from the specified string.

Version range string grammar:

 range ::= interval | atleast
 interval ::= ( '[' | '(' ) left ',' right ( ']' | ')' )
 left ::= version
 right ::= version
 atleast ::= version
 

Parameters:

range - String representation of the version range. The versions in the range must contain no whitespace. Other whitespace in the range string is ignored.

Throws:

IllegalArgumentException - If range is improperly formatted.

Method Detail

getLeft

public Version getLeft()

Returns the left endpoint of this version range.

Returns:

The left endpoint.

getRight

public Version getRight()

Returns the right endpoint of this version range.

Returns:

The right endpoint. May be null which indicates the right endpoint is Infinity.

getLeftType

public char getLeftType()

Returns the type of the left endpoint of this version range.

Returns:

LEFT_CLOSED if the left endpoint is closed or LEFT_OPEN if the left endpoint is open.

getRightType

public char getRightType()

Returns the type of the right endpoint of this version range.

Returns:

RIGHT_CLOSED if the right endpoint is closed or RIGHT_OPEN if the right endpoint is open.

includes

public boolean includes(Version version)

Returns whether this version range includes the specified version.

Parameters:

version - The version to test for inclusion in this version range.

Returns:

true if the specified version is included in this version range; false otherwise.

intersection

public VersionRange intersection(VersionRange... ranges)

Returns the intersection of this version range with the specified version ranges.

Parameters:

ranges - The version ranges to intersect with this version range.

Returns:

A version range representing the intersection of this version range and the specified version ranges. If no version ranges are specified, then this version range is returned.

isEmpty

public boolean isEmpty()

Returns whether this version range is empty. A version range is empty if the set of versions defined by the interval is empty.

Returns:

true if this version range is empty; false otherwise.

isExact

public boolean isExact()

Returns whether this version range contains only a single version.

Returns:

true if this version range contains only a single version; false otherwise.

toString

public String toString()

Returns the string representation of this version range.

The format of the version range string will be a version string if the right end point is Infinity (null) or an interval string.

Overrides:

toString in class Object

Returns:

The string representation of this version range.

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class Object

Returns:

An integer which is a hash code value for this object.

equals

public boolean equals(Object object)

Compares this VersionRange object to another object.

A version range is considered to be equal to another version range if both the endpoints and their types are equal or if both version ranges are empty.

Overrides:

equals in class Object

Parameters:

object - The VersionRange object to be compared.

Returns:

true if object is a VersionRange and is equal to this object; false otherwise.

toFilterString

public String toFilterString(String attributeName)

Returns the filter string for this version range using the specified attribute name.

Parameters:

attributeName - The attribute name to use in the returned filter string.

Returns:

A filter string for this version range using the specified attribute name.

Throws:

IllegalArgumentException - If the specified attribute name is not a valid attribute name.

See Also:

"Core Specification, Filters, for a description of the filter string syntax."