Class DefaultInfoImpl

java.lang.Object

org.apache.derby.catalog.types.DefaultInfoImpl

All Implemented Interfaces:

Externalizable, Serializable, DefaultInfo, Formatable, TypedFormat

public class DefaultInfoImpl
extends Object
implements DefaultInfo, Formatable

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	BITS_MASK_IS_DEFAULTVALUE_AUTOINC
private static final int	BITS_MASK_IS_GENERATED_COLUMN
private String	defaultText
private DataValueDescriptor	defaultValue	This class implements Formatable.
private String	originalCurrentSchema
private String[]	referencedColumnNames
private int	type

Constructor Summary

Constructors

Constructor	Description
DefaultInfoImpl()	Public niladic constructor.
DefaultInfoImpl(boolean isDefaultValueAutoinc, String defaultText, DataValueDescriptor defaultValue)	Constructor for use with numeric types
DefaultInfoImpl(String defaultText, String[] referencedColumnNames, String originalCurrentSchema)	Constructor for use with generated columns

Method Summary

Modifier and Type	Method	Description
private static int	calcType(boolean isDefaultValueAutoinc)	This function returns stored value for flags and so on.
String	getDefaultText()	Get the text of a default.
DataValueDescriptor	getDefaultValue()	Get the default value.
String	getOriginalCurrentSchema()	Return the name of the current schema when the default was created.
String[]	getReferencedColumnNames()	If this default is a generation clause, then return the names of other columns in the row which the generation clause references.
int	getTypeFormatId()	Get the formatID which corresponds to this class.
boolean	isDefaultValueAutoinc()	Is default value generated by auto increment?
boolean	isGeneratedColumn()	Return true if this is the generation clause for a generated column.
void	readExternal(ObjectInput in)	Read this object from a stream of stored objects.
void	setDefaultValue(DataValueDescriptor defaultValue)	Set the default value.
String	toString()
void	writeExternal(ObjectOutput out)	Write this object to a stream of stored objects.

Methods inherited from class Object

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

Field Details

defaultValue

private DataValueDescriptor defaultValue

This class implements Formatable. That means that it can write itself to and from a formatted stream. If you add more fields to this class, make sure that you also write/read them with the writeExternal()/readExternal() methods. If, inbetween releases, you add more fields to this class, then you should bump the version number emitted by the getTypeFormatId() method.

defaultText

private String defaultText

type

private int type

referencedColumnNames

private String[] referencedColumnNames

originalCurrentSchema

private String originalCurrentSchema

BITS_MASK_IS_DEFAULTVALUE_AUTOINC

private static final int BITS_MASK_IS_DEFAULTVALUE_AUTOINC

See Also:

• Constant Field Values

BITS_MASK_IS_GENERATED_COLUMN

private static final int BITS_MASK_IS_GENERATED_COLUMN

See Also:

• Constant Field Values

Constructor Details

DefaultInfoImpl

public DefaultInfoImpl()

Public niladic constructor. Needed for Formatable interface to work.

DefaultInfoImpl

public DefaultInfoImpl(boolean isDefaultValueAutoinc,
 String defaultText,
 DataValueDescriptor defaultValue)

Constructor for use with numeric types

Parameters:

defaultText - The text of the default.

DefaultInfoImpl

public DefaultInfoImpl(String defaultText,
 String[] referencedColumnNames,
 String originalCurrentSchema)

Constructor for use with generated columns

Parameters:

defaultText - Text of generation clause.

referencedColumnNames - names of other columns in the base row which are mentioned in the generation clause.

originalCurrentSchema - Schema in effect when the generate column was added to the table.

Method Details

getDefaultText

public String getDefaultText()

Description copied from interface: DefaultInfo

Get the text of a default.

Specified by:

getDefaultText in interface DefaultInfo

Returns:

The text of the default.

See Also:

• DefaultInfo.getDefaultText()

getReferencedColumnNames

public String[] getReferencedColumnNames()

Description copied from interface: DefaultInfo

If this default is a generation clause, then return the names of other columns in the row which the generation clause references.

Specified by:

getReferencedColumnNames in interface DefaultInfo

See Also:

• DefaultInfo.getReferencedColumnNames()

getOriginalCurrentSchema

public String getOriginalCurrentSchema()

Description copied from interface: DefaultInfo

Return the name of the current schema when the default was created. This is filled in for generated columns.

Specified by:

getOriginalCurrentSchema in interface DefaultInfo

See Also:

• DefaultInfo.getOriginalCurrentSchema()

toString

public String toString()

Overrides:

toString in class Object

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Read this object from a stream of stored objects.

Specified by:

readExternal in interface Externalizable

Parameters:

in - read this.

Throws:

IOException - thrown on error

ClassNotFoundException - thrown on error

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Write this object to a stream of stored objects.

Specified by:

writeExternal in interface Externalizable

Parameters:

out - write bytes here.

Throws:

IOException - thrown on error

getTypeFormatId

public int getTypeFormatId()

Get the formatID which corresponds to this class.

Specified by:

getTypeFormatId in interface TypedFormat

Returns:

the formatID of this class

getDefaultValue

public DataValueDescriptor getDefaultValue()

Get the default value. (NOTE: This returns null if the default is not a constant.)

Returns:

The default value.

setDefaultValue

public void setDefaultValue(DataValueDescriptor defaultValue)

Set the default value.

Parameters:

defaultValue - The default value.

isDefaultValueAutoinc

public boolean isDefaultValueAutoinc()

Description copied from interface: DefaultInfo

Is default value generated by auto increment?

Specified by:

isDefaultValueAutoinc in interface DefaultInfo

Returns:

true if always generated by auto increment.

See Also:

• DefaultInfo.isDefaultValueAutoinc()

isGeneratedColumn

public boolean isGeneratedColumn()

Description copied from interface: DefaultInfo

Return true if this is the generation clause for a generated column.

Specified by:

isGeneratedColumn in interface DefaultInfo

See Also:

• DefaultInfo.isGeneratedColumn()

calcType

private static int calcType(boolean isDefaultValueAutoinc)

This function returns stored value for flags and so on.