org.apache.commons.id.serial
Class PrefixedAlphanumericGenerator

java.lang.Object
  org.apache.commons.id.AbstractStringIdentifierGenerator
      org.apache.commons.id.serial.AlphanumericGenerator
          org.apache.commons.id.serial.PrefixedAlphanumericGenerator

All Implemented Interfaces:

java.io.Serializable, IdentifierGenerator, StringIdentifierGenerator

public class PrefixedAlphanumericGenerator
extends AlphanumericGenerator

PrefixedAlphanumericGenerator is an identifier generator that generates an incrementing number in base 36 with a prefix as a String object.

All generated ids have the same length (prefixed and padded with 0's on the left), which is determined by the size parameter passed to the constructor.

The wrap property determines whether or not the sequence wraps when it reaches the largest value that can be represented in size base 36 digits. If wrap is false and the the maximum representable value is exceeded, an IllegalStateException is thrown.

Version:

$Id$

Author:

Commons-Id team

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.commons.id.AbstractStringIdentifierGenerator

ALPHA_NUMERIC_CHARSET_SIZE, DEFAULT_ALPHANUMERIC_IDENTIFIER_SIZE, MAX_INT_ALPHANUMERIC_VALUE_LENGTH, MAX_INT_NUMERIC_VALUE_LENGTH, MAX_LONG_ALPHANUMERIC_VALUE_LENGTH, MAX_LONG_NUMERIC_VALUE_LENGTH

Fields inherited from interface org.apache.commons.id.StringIdentifierGenerator

INFINITE_MAX_LENGTH

Constructor Summary

PrefixedAlphanumericGenerator(java.lang.String prefix, boolean wrap, int size)
Create a new prefixed alphanumeric generator with the specified prefix.

Method Summary

java.lang.String	getPrefix() Return the prefix for this prefixed alphanumeric generator.
int	getSize() Returns the (constant) size of the strings generated by this generator.
long	maxLength() Returns the maximum length (number or characters) for an identifier from this sequence.
long	minLength() Returns the minimum length (number of characters) for an identifier from this sequence.
java.lang.String	nextStringIdentifier() Gets the next identifier in the sequence.

Methods inherited from class org.apache.commons.id.serial.AlphanumericGenerator

isWrap, setWrap

Methods inherited from class org.apache.commons.id.AbstractStringIdentifierGenerator

nextIdentifier

Methods inherited from class java.lang.Object

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

Constructor Detail

PrefixedAlphanumericGenerator

public PrefixedAlphanumericGenerator(java.lang.String prefix,
                                     boolean wrap,
                                     int size)

Create a new prefixed alphanumeric generator with the specified prefix.

Parameters:

prefix - prefix, must not be null

wrap - should the factory wrap when it reaches the maximum value that can be represented in size base 36 digits (or throw an exception)

size - the size of the identifier, including prefix length

Throws:

java.lang.IllegalArgumentException - if size less prefix length is not at least one

java.lang.NullPointerException - if prefix is null

Method Detail

getPrefix

public java.lang.String getPrefix()

Return the prefix for this prefixed alphanumeric generator.

Returns:

the prefix for this prefixed alphanumeric generator

maxLength

public long maxLength()

Description copied from class: AbstractStringIdentifierGenerator

Returns the maximum length (number or characters) for an identifier from this sequence.

The default implementation returns StringIdentifierGenerator.INFINITE_MAX_LENGTH. Implementations with bounded length identifiers should override this method to return the maximum length of a generated identifier.

Specified by:

maxLength in interface StringIdentifierGenerator

Overrides:

maxLength in class AlphanumericGenerator

Returns:

the maximum identifier length, or StringIdentifierGenerator.INFINITE_MAX_LENGTH if there is no upper bound

minLength

public long minLength()

Description copied from class: AbstractStringIdentifierGenerator

Returns the minimum length (number of characters) for an identifier from this sequence.

The default implementation returns 0. Implementations with identifiers having a postive minimum length should override this method to return the maximum length of a generated identifier.

Specified by:

minLength in interface StringIdentifierGenerator

Overrides:

minLength in class AlphanumericGenerator

Returns:

the minimum identifier length

getSize

public int getSize()

Description copied from class: AlphanumericGenerator

Returns the (constant) size of the strings generated by this generator.

Overrides:

getSize in class AlphanumericGenerator

Returns:

the size of generated identifiers

nextStringIdentifier

public java.lang.String nextStringIdentifier()

Description copied from interface: StringIdentifierGenerator

Gets the next identifier in the sequence.

Specified by:

nextStringIdentifier in interface StringIdentifierGenerator

Overrides:

nextStringIdentifier in class AlphanumericGenerator

Returns:

the next String identifier in sequence