org.castor.ddlgen.keygenerator
Class HighLowKeyGenerator

java.lang.Object
  org.castor.ddlgen.schemaobject.AbstractSchemaObject
      org.castor.ddlgen.schemaobject.KeyGenerator
          org.castor.ddlgen.keygenerator.HighLowKeyGenerator

All Implemented Interfaces:

SchemaObject

public final class HighLowKeyGenerator
extends KeyGenerator

HIGH-LOW key generator will be handled by Castor so no DDL needs to be created. It only requires a table to lookup the next values to be used.

Since:

1.1

Version:

$Revision: 8993 $ $Date: 2011-08-02 01:28:52 +0200 (Di, 02 Aug 2011) $

Author:

Le Duc Bao, Ralf Joachim

Field Summary

static String

ALGORITHM_NAME Name of key generator algorithm.

Fields inherited from class org.castor.ddlgen.schemaobject.AbstractSchemaObject

HASHFACTOR

Constructor Summary

HighLowKeyGenerator(KeyGeneratorDef definition)
Constructor for HIGH-LOW key generator specified by given defintion.

Method Summary

int	getGrabSize() Get number of new keys the key generator should grab from the sequence table at a time.
String	getKeyColumn() Get name of the column which contains table names.
String	getTableName() Get name of the special sequence table.
String	getValueColumn() Get name of the column which is used to reserve primary key values.
boolean	isGlobal() Shell globally unique keys be generated?
boolean	isSameConnection() Shell the same Connection be used for writing to the sequence table?
void	toCreateDDL(DDLWriter writer) Build create script for the schema object.
void	toDropDDL(DDLWriter writer) Build drop script for the schema object.

Methods inherited from class org.castor.ddlgen.schemaobject.KeyGenerator

equals, getAlias, getTable, hashCode, merge, setAlias, setTable

Methods inherited from class org.castor.ddlgen.schemaobject.AbstractSchemaObject

equals, getConfiguration, getName, setConfiguration, setName

Methods inherited from class java.lang.Object

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

Field Detail

ALGORITHM_NAME

public static final String ALGORITHM_NAME

Name of key generator algorithm.

See Also:

Constant Field Values

Constructor Detail

HighLowKeyGenerator

public HighLowKeyGenerator(KeyGeneratorDef definition)
                    throws GeneratorException

Constructor for HIGH-LOW key generator specified by given defintion.

Parameters:

definition - Key generator definition.

Throws:

GeneratorException - If grab size parameter can't be parsed as integer.

Method Detail

getTableName

public String getTableName()

Get name of the special sequence table.

Returns:

Name of the special sequence table.

getKeyColumn

public String getKeyColumn()

Get name of the column which contains table names.

Returns:

Name of the column which contains table names.

getValueColumn

public String getValueColumn()

Get name of the column which is used to reserve primary key values.

Returns:

Name of the column which is used to reserve primary key values.

getGrabSize

public int getGrabSize()

Get number of new keys the key generator should grab from the sequence table at a time.

Returns:

Number of new keys the key generator should grab from the sequence table at a time.

isSameConnection

public boolean isSameConnection()

Shell the same Connection be used for writing to the sequence table?

Returns:

If true it uses the same connection t write to the sequence table.

isGlobal

public boolean isGlobal()

Shell globally unique keys be generated?

Returns:

If true globally unique keys are generated.

toCreateDDL

public void toCreateDDL(DDLWriter writer)

Build create script for the schema object.

Parameters:

writer - DDLWriter to write schema objects to.

toDropDDL

public void toDropDDL(DDLWriter writer)

Build drop script for the schema object.

Parameters:

writer - DDLWriter to write schema objects to.