Package de.uni_trier.wi2.procake.similarity.base.aggregate

Interface SMAggregate

All Superinterfaces:

SimilarityMeasure

All Known Subinterfaces:

SMAggregateAverage, SMAggregateEuclidian, SMAggregateKMaximum, SMAggregateKMinimum, SMAggregateMaximum, SMAggregateMinimum, SMAggregateMinkowski, SMAggregateWeighted

All Known Implementing Classes:

SMAggregateAverageImpl, SMAggregateEuclidianImpl, SMAggregateImpl, SMAggregateKMaximumImpl, SMAggregateKMinimumImpl, SMAggregateMaximumImpl, SMAggregateMinimumImpl, SMAggregateMinkowskiImpl, SMAggregateWeightedImpl

public interface SMAggregate
extends SimilarityMeasure

Abstract interface that collects all similarity measures for AggregateClasses.

Global similarity measures are defined by applying an aggregation function Φ to the local similarity values. The simple similarity measures for numeric attributes can be generalized easily to aggregation functions. Such aggregation functions are defined by determining

• a basic aggregation function and
• a weight model that determines weights ω = (ω₁,\ldots, ω_i) such that 0 ≤ ω_i ≤ 1 and ∑¹_n ω_i = 1

The default weight is 1.0 for all attributes. To ensure that ∑¹_n ω_i = 1 all weights will be normalized automatically during runtime.

The aggregate measures can be defined in the xml file sim.xml. Therefore, it's necessary that an aggregate class was created in the xml file model.xml, which is referenced in the definition of the measure. It also needs an arbitrary name. In the inner tag, weights for the single attributes can be defined. The aggregate classes Average, Euclidian and Minkowski need weights anyway, otherwise the similarity will always be 1.0. The other classes will have the same weight for each attribute, if no weights are defined.

For example, an aggregate measure can look like:

     <AggregateMinimum name="AggregateMinimumDataflowWeighted" class="DataflowElement" default="false">
          <AggWeight att="name" weight="0.5"/>
     </AggregateMinimum>
 

Author:

Rainer Maximini

Field Summary

Fields

Modifier and Type	Field	Description
static String	COMPONENT	Component: "cake.data.similarity" (LogComponentIdentifier.COMPONENT)
static String	COMPONENT_KEY	Component-Key: "02" (LogComponentIdentifier.COMPONENT_KEY_SMAGGREGATE)
static boolean	DEFAULT_IGNORE_NULL_ATTRIBUTES_IN_QUERY	The default for ignoring null attribute values as void is true.
static String	LOG_ATTRIBUTE_NAME_NOT_FOUND	Attribute-name not found in aggregate class in current measure.
static String	LOG_ATTRIBUTE_NOT_FOUND	Attribute not found in aggregate class in current measure.
static String	PROPERTY_USER_WEIGHT	The query case can contain user weights $w_u$ that are stored in the properties, accessable with this key.

Fields inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure

LOG_ORDER_NAME_NOT_FOUND

Method Summary

Modifier and Type	Method	Description
boolean	isIgnoreNullAttributesInQuery()
void	setIgnoreNullAttributesInQuery(boolean ignoreNullAttributesInQuery)

Methods inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure

compute, getDataClass, getName, getSystemName, isForceOverride, isReusable, setForceOverride

Field Detail

DEFAULT_IGNORE_NULL_ATTRIBUTES_IN_QUERY

static final boolean DEFAULT_IGNORE_NULL_ATTRIBUTES_IN_QUERY

The default for ignoring null attribute values as void is true.

See Also:

Constant Field Values

COMPONENT

static final String COMPONENT

Component: "cake.data.similarity" (LogComponentIdentifier.COMPONENT)

See Also:

Constant Field Values

COMPONENT_KEY

static final String COMPONENT_KEY

Component-Key: "02" (LogComponentIdentifier.COMPONENT_KEY_SMAGGREGATE)

See Also:

Constant Field Values

LOG_ATTRIBUTE_NAME_NOT_FOUND

static final String LOG_ATTRIBUTE_NAME_NOT_FOUND

Attribute-name not found in aggregate class in current measure.

0. Component: COMPONENT
1. Key: "0200"
2. this
3. Class: AggregateClass
4. Attributename

See Also:

Constant Field Values

LOG_ATTRIBUTE_NOT_FOUND

static final String LOG_ATTRIBUTE_NOT_FOUND

Attribute not found in aggregate class in current measure.

0. Component: COMPONENT
1. Key: "0201"
2. this
3. Class: AggregateClass
4. Attribute

See Also:

Constant Field Values

PROPERTY_USER_WEIGHT

static final String PROPERTY_USER_WEIGHT

The query case can contain user weights $w_u$ that are stored in the properties, accessable with this key. The weight $w$ for an attrbibute is the mulitplikation of $w_u$ and $w_c$, the weight defined for the class.

See Also:

Constant Field Values

Method Detail

isIgnoreNullAttributesInQuery

boolean isIgnoreNullAttributesInQuery()

Returns:

setIgnoreNullAttributesInQuery

void setIgnoreNullAttributesInQuery(boolean ignoreNullAttributesInQuery)

Parameters:

ignoreNullAttributesInQuery -