Package org.pentaho.di.core.row.value

Class ValueMetaFactory

java.lang.Object

org.pentaho.di.core.row.value.ValueMetaFactory

public class ValueMetaFactory
extends Object

This class will hand out value meta objects from the plugin registry.

Author:

matt

Field Summary

Fields

Modifier and Type	Field	Description
static PluginRegistry	pluginRegistry

Constructor Summary

Constructors

Constructor	Description
ValueMetaFactory()

Method Summary

Modifier and Type	Method	Description
static void	cloneInfo(ValueMetaInterface source, ValueMetaInterface target)
static ValueMetaInterface	cloneValueMeta(ValueMetaInterface source)
static ValueMetaInterface	cloneValueMeta(ValueMetaInterface source, int targetType)
static ValueMetaInterface	createValueMeta(int type)
static ValueMetaInterface	createValueMeta(String name, int type)
static ValueMetaInterface	createValueMeta(String name, int type, int length, int precision)
static String[]	getAllValueMetaNames()
static int	getIdForValueMeta(String valueMetaName)
static String	getValueMetaName(int type)
static String[]	getValueMetaNames()
static List<ValueMetaInterface>	getValueMetaPluginClasses()
static ValueMetaInterface	guessValueMetaInterface(Object object)	This method makes attempt to guess kettle value meta interface based on Object class.

Methods inherited from class java.lang.Object

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

Field Detail

pluginRegistry

public static PluginRegistry pluginRegistry

Constructor Detail

ValueMetaFactory

public ValueMetaFactory()

Method Detail

createValueMeta

public static ValueMetaInterface createValueMeta(String name,
                                                 int type,
                                                 int length,
                                                 int precision)
                                          throws KettlePluginException

Throws:

KettlePluginException

createValueMeta

public static ValueMetaInterface createValueMeta(String name,
                                                 int type)
                                          throws KettlePluginException

Throws:

KettlePluginException

createValueMeta

public static ValueMetaInterface createValueMeta(int type)
                                          throws KettlePluginException

Throws:

KettlePluginException

cloneValueMeta

public static ValueMetaInterface cloneValueMeta(ValueMetaInterface source)
                                         throws KettlePluginException

Throws:

KettlePluginException

cloneValueMeta

public static ValueMetaInterface cloneValueMeta(ValueMetaInterface source,
                                                int targetType)
                                         throws KettlePluginException

Throws:

KettlePluginException

cloneInfo

public static void cloneInfo(ValueMetaInterface source,
                             ValueMetaInterface target)
                      throws KettlePluginException

Throws:

KettlePluginException

getValueMetaNames

public static String[] getValueMetaNames()

getAllValueMetaNames

public static String[] getAllValueMetaNames()

getValueMetaName

public static String getValueMetaName(int type)

getIdForValueMeta

public static int getIdForValueMeta(String valueMetaName)

getValueMetaPluginClasses

public static List<ValueMetaInterface> getValueMetaPluginClasses()
                                                          throws KettlePluginException

Throws:

KettlePluginException

guessValueMetaInterface

public static ValueMetaInterface guessValueMetaInterface(Object object)

This method makes attempt to guess kettle value meta interface based on Object class. This may be the case when we somehow obtain an Object as a result of any calculation, and we are trying to assign some ValueMeta for it.

As an example - we have target value meta Number (which is java Double under the hood) and value as a BigDecimal.
This BigDecimal can be converted to a Double value.
we have ValueMetaInterface.convertData(ValueMetaInterface, Object) call for this where is ValueMetaInterface object is our target value meta, Object is a BigDecimal - so we need to pass ValueMetaBigNumber as a first parameter, value Object as a second and as the result we will have target Double (ValueMetaNumber) value so we can safely put it into output rowset.

Something similar we had for ValueMetaBase.getValueFromSQLType(...) to guess value meta for java sql type.

Currently this method does not have support for plugin value meta. Hope if this approach will be found usable this may be implemented later.

Parameters:

object - object to guess applicable ValueMetaInterface.

Returns:

See Also:

if the kettle value meta is recognized, null otherwise.