edu.udo.cs.yale.example
Class AttributeFactory

java.lang.Object
  edu.udo.cs.yale.example.AttributeFactory

public class AttributeFactory
extends java.lang.Object

This class is used to create and clone attributes. It should be used to create attributes instead of directly creating them by using constructors. Additionally, it provides some helper methods for attribute creation purposes (name creation, block numbers,...).

Version:

$Id: AttributeFactory.java,v 2.12 2006/03/21 15:35:39 ingomierswa Exp $

Author:

Ingo Mierswa

Field Summary

private static java.lang.String	GENSYM_PREFIX The prefix of the name of generated attributes.
private static java.util.Map<java.lang.String,java.lang.Integer>	nameCounters The current highest id counters for generated attribute names.

Constructor Summary

AttributeFactory()

Method Summary

static Attribute	changeValueType(Attribute attribute, int valueType) Changes the value type of the given attribute and returns a new attribute with the same properties but the new value type.
static Attribute	createAttribute(Attribute attribute) Simple clone factory method for attributes.
static Attribute	createAttribute(Attribute attribute, java.lang.String functionName) Simple clone factory method for attributes.
static Attribute	createAttribute(int valueType) Creates a simple single attribute depending on the given value type.
static Attribute	createAttribute(int valueType, int blockType, int blockNumber, java.lang.String units) Creates a simple single attribute depending on the given value type.
static Attribute	createAttribute(int valueType, int blockType, int blockNumber, java.lang.String functionName, Attribute[] arguments, java.lang.String units) Creates a simple attribute depending on the given value type.
static Attribute	createAttribute(java.lang.String functionName, Attribute[] arguments) Creates a single numerical constructed attribute.
static Attribute	createAttribute(java.lang.String name, int valueType) Creates a simple single attribute depending on the given value type.
static Attribute	createAttribute(java.lang.String name, int valueType, int blockType, int blockNumber, java.lang.String units) Creates a simple attribute depending on the given value type.
static java.lang.String	createName() Creates a new unsused attribute name.
static java.lang.String	createName(java.lang.String prefix) Creates a new unsused attribute name with a given prefix.
static int	getNextFreeBlockNumber() Returns the next free block number.
static Attribute	readAttribute(java.io.DataInput in) Reads the attribute data from an input stream.
static void	resetNameCounters() Resets the counters for the generated attribute names.

Methods inherited from class java.lang.Object

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

Field Detail

GENSYM_PREFIX

private static final java.lang.String GENSYM_PREFIX

The prefix of the name of generated attributes.

See Also:

Constant Field Values

nameCounters

private static java.util.Map<java.lang.String,java.lang.Integer> nameCounters

The current highest id counters for generated attribute names. The counter will be increased each time an attribute name is generated more than once.

Constructor Detail

AttributeFactory

public AttributeFactory()

Method Detail

createAttribute

public static Attribute createAttribute(java.lang.String name,
                                        int valueType)

Creates a simple single attribute depending on the given value type.

createAttribute

public static Attribute createAttribute(int valueType)

Creates a simple single attribute depending on the given value type. The name is randomly created. This attribute can also be used for generators to define their desired input attributes for compatibility checks.

createAttribute

public static Attribute createAttribute(java.lang.String functionName,
                                        Attribute[] arguments)

Creates a single numerical constructed attribute.

createAttribute

public static Attribute createAttribute(int valueType,
                                        int blockType,
                                        int blockNumber,
                                        java.lang.String functionName,
                                        Attribute[] arguments,
                                        java.lang.String units)

Creates a simple attribute depending on the given value type.

createAttribute

public static Attribute createAttribute(java.lang.String name,
                                        int valueType,
                                        int blockType,
                                        int blockNumber,
                                        java.lang.String units)

Creates a simple attribute depending on the given value type.

createAttribute

public static Attribute createAttribute(int valueType,
                                        int blockType,
                                        int blockNumber,
                                        java.lang.String units)

Creates a simple single attribute depending on the given value type.

createAttribute

public static Attribute createAttribute(Attribute attribute)

Simple clone factory method for attributes. Invokes createAttribute(Attribute att, String name) with name = null.

createAttribute

public static Attribute createAttribute(Attribute attribute,
                                        java.lang.String functionName)

Simple clone factory method for attributes. Returns the clone of the given attribute and sets the function name to the given one if not null. In this case the attribute is used as an argument of returned attribute. This method might be usefull for example to create a prediction attribute with the same properties as the original label attribute.

changeValueType

public static Attribute changeValueType(Attribute attribute,
                                        int valueType)

Changes the value type of the given attribute and returns a new attribute with the same properties but the new value type.

readAttribute

public static Attribute readAttribute(java.io.DataInput in)
                               throws java.io.IOException

Reads the attribute data from an input stream.

Throws:

java.io.IOException

resetNameCounters

public static void resetNameCounters()

Resets the counters for the generated attribute names.

createName

public static java.lang.String createName()

Creates a new unsused attribute name.

createName

public static java.lang.String createName(java.lang.String prefix)

Creates a new unsused attribute name with a given prefix.

getNextFreeBlockNumber

public static int getNextFreeBlockNumber()

Returns the next free block number.