AbstractIdGenerator (Apache Excalibur API)

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org.apache.avalon.excalibur.datasource.ids
Class AbstractIdGenerator

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.avalon.excalibur.datasource.ids.AbstractIdGenerator

All Implemented Interfaces:: Component, IdGenerator, LogEnabled, ThreadSafe

Direct Known Subclasses:: AbstractDataSourceIdGenerator

public abstract class AbstractIdGenerator
extends AbstractLogEnabled
implements IdGenerator, ThreadSafe

Since:: 4.1
Version:: CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:17 $
Author:: Avalon Development Team

Field Summary

Fields inherited from interface org.apache.avalon.excalibur.datasource.ids.IdGenerator

ROLE

Constructor Summary
`AbstractIdGenerator()`

Method Summary
`java.math.BigDecimal`	`getNextBigDecimalId()` Returns the next Id from the pool.
`protected abstract java.math.BigDecimal`	`getNextBigDecimalIdInner()` Gets the next id as a Big Decimal.
`byte`	`getNextByteId()` Returns the next Id from the pool.
`int`	`getNextIntegerId()` Returns the next Id from the pool.
`long`	`getNextLongId()` Returns the next Id from the pool.
`protected long`	`getNextLongIdChecked(long maxId)` Gets the next Long Id constraining the value to be less than the specified maxId.
`protected abstract long`	`getNextLongIdInner()` Gets the next id as a long.
`short`	`getNextShortId()` Returns the next Id from the pool.
`protected boolean`	`isUsingBigDecimals()` Returns true if the internal data type is using BigDecimals, false if it is using longs.
`protected void`	`setUseBigDecimals(boolean useBigDecimals)` By default, the IdGenerator will operate using a backend datatype of type long.

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractIdGenerator

public AbstractIdGenerator()

Method Detail

getNextBigDecimalIdInner

protected abstract java.math.BigDecimal getNextBigDecimalIdInner()
                                                          throws IdException

Gets the next id as a Big Decimal. This method will only be called when synchronized and when the data type is configured to be BigDecimal.

Returns:: the next id as a BigDecimal.
Throws:: IdException - if an Id could not be allocated for any reason.

getNextLongIdInner

protected abstract long getNextLongIdInner()
                                    throws IdException

Gets the next id as a long. This method will only be called when synchronized and when the data type is configured to be long.

Returns:: the next id as a long.
Throws:: IdException - if an Id could not be allocated for any reason.

setUseBigDecimals

protected final void setUseBigDecimals(boolean useBigDecimals)

By default, the IdGenerator will operate using a backend datatype of type long. This is the most efficient, however it does not allow for Ids that are larger than Long.MAX_VALUE. To allow very large Ids, it is necessary to make use of the BigDecimal data storage type. This method should only be called durring initialization.

Parameters:: useBigDecimals - True to set BigDecimal as the internal data type.

isUsingBigDecimals

protected final boolean isUsingBigDecimals()

Returns true if the internal data type is using BigDecimals, false if it is using longs.

getNextLongIdChecked

protected final long getNextLongIdChecked(long maxId)
                                   throws IdException

Gets the next Long Id constraining the value to be less than the specified maxId.

Throws:: IdException - if the next id is larger than the specified maxId.