infovis.column
Class ColumnFactory

java.lang.Object
  infovis.utils.BasicFactory
      infovis.column.ColumnFactory

public class ColumnFactory
extends BasicFactory

Factory of Columns to create a new column based on its type name and density/sparsity.

Version:

$Revision: 1.10 $

Author:

Jean-Daniel Fekete

Nested Class Summary

static interface	ColumnFactory.Creator Column Creator for the Factory.
static class	ColumnFactory.DefaultCreator Default implementation of Creator.

Field Summary

static int	COLUMN_TYPE_DEFAULT Constant for requesting a column by default.
static int	COLUMN_TYPE_DENSE Constant for requesting a dense column.
static int	COLUMN_TYPE_SPARSE Constant for requesting a sparse column.

Method Summary

void	add(ColumnFactory.Creator c) Adds a creator using its name.
void	add(String type, ColumnFactory.Creator c) Adds a new creator associated with a specified type name.
void	add(String type, String columnClass, String density) Adds a new creator associated with a specified type name and density name.
Column	create(String typeName, int type, String name) Create a Column given its type name and density type.
Column	create(String typeName, String name) Create a Column given its type name.
static Column	createColumn(String typeName, int type, String name) Utility method to create a column from a type name using a specified name and sparsity/density specification.
static Column	createColumn(String typeName, String name) Utility method to create a column from a type name using a specified name.
ColumnFactory.Creator	getCreator(String typeName) Returns a creator for the specified type name.
ColumnFactory.Creator	getCreator(String typeName, int type) Returns the creator for a specified type name and density type.
static ColumnFactory	getInstance() Returns the current instance of this factory.
String	getTypeName(Column col) Returns a registered type name for a specified column.
Iterator	iterator() Returns an iterator over the type names maintained by the factory.
boolean	remove(ColumnFactory.Creator c) Removes a creator from this factory.
static void	setInstance(ColumnFactory factory) Sets the current instance of this factory.

Methods inherited from class infovis.utils.BasicFactory

loadProperties

Methods inherited from class java.lang.Object

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

Field Detail

COLUMN_TYPE_DENSE

public static final int COLUMN_TYPE_DENSE

Constant for requesting a dense column.

See Also:

Constant Field Values

COLUMN_TYPE_SPARSE

public static final int COLUMN_TYPE_SPARSE

Constant for requesting a sparse column.

See Also:

Constant Field Values

COLUMN_TYPE_DEFAULT

public static final int COLUMN_TYPE_DEFAULT

Constant for requesting a column by default.

See Also:

Constant Field Values

Method Detail

getInstance

public static ColumnFactory getInstance()

Returns the current instance of this factory.

Returns:

the current instance of this factory.

setInstance

public static void setInstance(ColumnFactory factory)

Sets the current instance of this factory.

Parameters:

factory - the new instance.

createColumn

public static Column createColumn(String typeName,
                                  String name)

Utility method to create a column from a type name using a specified name.

Delegates the creation to the current instance.

Parameters:

typeName - the type name

name - the column name

Returns:

a column of the specified type with the given name of null if the type is not known.

createColumn

public static Column createColumn(String typeName,
                                  int type,
                                  String name)

Utility method to create a column from a type name using a specified name and sparsity/density specification.

Delegates the creation to the current instance.

Parameters:

typeName - the type name

type - density, either COLUMN_TYPE_DENSE or COLUMN_TYPE_SPARSE.

name - the column name

Returns:

a column of the specified type with the given name of null if the type is not known.

iterator

public Iterator iterator()

Returns an iterator over the type names maintained by the factory.

Returns:

an iterator over the type names maintained by the factory.

add

public void add(String type,
                ColumnFactory.Creator c)

Adds a new creator associated with a specified type name.

Parameters:

type - the type name

c - the Creator

add

public void add(String type,
                String columnClass,
                String density)

Adds a new creator associated with a specified type name and density name.

Parameters:

type - the type name

columnClass - the class of column to create for this type name

density - a string "DENSE" or "SPARSE"

add

public void add(ColumnFactory.Creator c)

Adds a creator using its name.

Parameters:

c - the creator

remove

public boolean remove(ColumnFactory.Creator c)

Removes a creator from this factory.

Parameters:

c - the creator

Returns:

true if the creator existed and has been removed.

getCreator

public ColumnFactory.Creator getCreator(String typeName,
                                        int type)

Returns the creator for a specified type name and density type.

Parameters:

typeName - the type name

type - the density

Returns:

the creator for a specified type name and density type or null.

getCreator

public ColumnFactory.Creator getCreator(String typeName)

Returns a creator for the specified type name.

Parameters:

typeName - the type name

Returns:

a creator for the specified type name

create

public Column create(String typeName,
                     int type,
                     String name)

Create a Column given its type name and density type.

Parameters:

typeName - the type name of the column

type - the density

name - the column name

Returns:

a Column or null

create

public Column create(String typeName,
                     String name)

Create a Column given its type name.

Parameters:

typeName - the type name of the column

name - the column name

Returns:

a Column or null

getTypeName

public String getTypeName(Column col)

Returns a registered type name for a specified column.

Parameters:

col - the column

Returns:

a registered type name for the specified column.