infovis.metadata
Class MinAggregation

java.lang.Object
  infovis.metadata.MinAggregation

All Implemented Interfaces:

Aggregation, AggregationConstants, Constants

public class MinAggregation
extends Object
implements Aggregation

Aggregate by computing the min value

Version:

$Revision: 1.4 $

Author:

Jean-Daniel Fekete

InfoVis factory arguments:

AggregationFactory Min

Nested Class Summary

static class

MinAggregation.DenseColumn

Field Summary

Fields inherited from interface infovis.metadata.AggregationConstants

AGGREGATE_COMPATIBLE, AGGREGATE_NO, AGGREGATE_YES, AGGREGATION_TYPE, AGGREGATION_TYPE_ADDITIVE, AGGREGATION_TYPE_ATLEAF, AGGREGATION_TYPE_CONCAT, AGGREGATION_TYPE_MAX, AGGREGATION_TYPE_MEAN, AGGREGATION_TYPE_MIN, AGGREGATION_TYPE_NONE

Fields inherited from interface infovis.metadata.Constants

CONTRIBUTOR, COVERAGE, CREATOR, DATE, DESCRITION, FORMAT, IDENTIFIER, LANGUAGE, PUBLISHER, RELATION, RIGHTS, SOURCE, SUBJECT, TITLE, TYPE

Constructor Summary

MinAggregation()

Method Summary

Column	aggregate(Column src, Tree tree, Column dst) Computes the aggregation values of the specified source column into the destination column.
static ColumnProxy	build(Column src, Tree tree)
static MinAggregation	getInstance()
String	getType() Returns the type name of the aggregation.
boolean	isAggregating(Column col, Tree tree) Checks whether a column is aggregating following the class aggregation scheme.

Methods inherited from class java.lang.Object

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

Constructor Detail

MinAggregation

public MinAggregation()

Method Detail

getInstance

public static MinAggregation getInstance()

isAggregating

public boolean isAggregating(Column col,
                             Tree tree)

Description copied from interface: Aggregation

Checks whether a column is aggregating following the class aggregation scheme.

Specified by:

isAggregating in interface Aggregation

Parameters:

col - the column

tree - the tree

Returns:

true if the column follows the aggregation scheme, false otherwise.

aggregate

public Column aggregate(Column src,
                        Tree tree,
                        Column dst)

Description copied from interface: Aggregation

Computes the aggregation values of the specified source column into the destination column. Source and destination should be allocated and of the right type.

Specified by:

aggregate in interface Aggregation

Parameters:

src - the source column

tree - the tree

dst - the destination column

Returns:

the dst column.

getType

public String getType()

Description copied from interface: Aggregation

Returns the type name of the aggregation.

Specified by:

getType in interface Aggregation

Returns:

the type name of the aggregation.

build

public static ColumnProxy build(Column src,
                                Tree tree)