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javax.ide.util
Class Version  

java.lang.Object
  javax.ide.util.Version

All Implemented Interfaces:

java.lang.Comparable

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public final class Version

extends java.lang.Object

implements java.lang.Comparable

Represents the version number of an extension or component. A version number is an immutable ordered sequence of integer values.

Version numbers can be represented in two forms. When you construct a new Version object using a String representation of the version number, this String representation is stored and returned by the toString() 55 method. This form of the version number will retain any redundant leading zeros in any of the integer values which make up the version number.

Conversely, in the canonical form, a version number does not retain leading zeros. The canonical form of new Version( "1.02.03" ) would be "1.2.3". You can retrieve the canonical form of a Version object using the toCanonicalString() 55 method.

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Field Summary
private static java.util.HashMap	_convertCache
private  int[]	_numbers
private  java.lang.String	_versionLabel

 

Constructor Summary

Version(java.lang.String versionLabel)           Constructs a Version object from a String representation.

 

Method Summary
int	compareTo(java.lang.Object other)           Compare this version object with another version object.
private  int[]	convert(java.lang.String versionLabel)
boolean	equals(java.lang.Object other)           Compare this version object with another version object for equality.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
java.lang.String	toCanonicalString()           Get this version number as a canonicalized string.
int[]	toIntArray()           Converts this Version to an int array.
java.lang.String	toString()           Get this version number as a string.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_convertCache

private static final java.util.HashMap _convertCache

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_numbers

private final int[] _numbers

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_versionLabel

private final java.lang.String _versionLabel

Constructor Detail

Version

public Version(java.lang.String versionLabel)
        throws java.lang.NumberFormatException

Constructs a Version object from a String representation.

Method Detail

toIntArray

public int[] toIntArray()

Converts this Version to an int array.

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compareTo

public int compareTo(java.lang.Object other)

Compare this version object with another version object. Comparison of two version numbers applies to the canonical form of the version number. For example, the result of evaluating the expression new Version( "1.05.07" ).compareTo( new Version( "1.5.0006" ) ) is a positive integer indicating that version 1.5.7 is greater than 1.5.6.

Specified by:

compareTo in interface java.lang.Comparable

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toString

public java.lang.String toString()

Get this version number as a string. The string returned is equal to the string provided in the constructor. For example, new Version( "1.05.06" ).toString(); would return "1.05.06".

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toCanonicalString

public java.lang.String toCanonicalString()

Get this version number as a canonicalized string. Leading zeros will be removed from all numerical components of the version. For example, new Version( "1.05.06" ).toString(); would return "1.5.6".

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equals

public boolean equals(java.lang.Object other)

Compare this version object with another version object for equality. Equality of two version numbers applies to the canonical form of the version number. For example, the result of evaluating the expression new Version( "1.05.06" ).equals( new Version( "1.5.0006" ) ) is true.

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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convert

private int[] convert(java.lang.String versionLabel)
               throws java.lang.NumberFormatException

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