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package de.lmu.ifi.dbs.elki.datasource.filter;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.ArrayList;
import java.util.List;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.data.type.VectorFieldTypeInformation;
import de.lmu.ifi.dbs.elki.datasource.bundle.MultipleObjectsBundle;
import de.lmu.ifi.dbs.elki.utilities.exceptions.AbortException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.constraints.ListGreaterEqualConstraint;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.IntListParameter;
/**
* Split an existing column into two types.
*
* @author Erich Schubert
*/
public class SplitNumberVectorFilter<V extends NumberVector<V, ?>> implements ObjectFilter {
/**
* Selected dimensions.
*/
final int[] dims;
/**
* Constructor.
*
* @param dims Dimensions to use.
*/
public SplitNumberVectorFilter(int[] dims) {
super();
this.dims = dims;
}
@Override
public MultipleObjectsBundle filter(MultipleObjectsBundle objects) {
if(objects.dataLength() == 0) {
return objects;
}
MultipleObjectsBundle bundle = new MultipleObjectsBundle();
for(int r = 0; r < objects.metaLength(); r++) {
@SuppressWarnings("unchecked")
SimpleTypeInformation<Object> type = (SimpleTypeInformation<Object>) objects.meta(r);
@SuppressWarnings("unchecked")
final List<Object> column = (List<Object>) objects.getColumn(r);
if(!getInputTypeRestriction().isAssignableFromType(type)) {
bundle.appendColumn(type, column);
continue;
}
// Should be a vector type after above test.
@SuppressWarnings("unchecked")
final VectorFieldTypeInformation<V> vtype = VectorFieldTypeInformation.class.cast(type);
// Get the replacement type informations
VectorFieldTypeInformation<V> type1 = new VectorFieldTypeInformation<V>(type.getRestrictionClass(), dims.length, dims.length);
VectorFieldTypeInformation<V> type2 = new VectorFieldTypeInformation<V>(type.getRestrictionClass(), vtype.dimensionality() - dims.length, vtype.dimensionality() - dims.length);
final List<V> col1 = new ArrayList<V>(column.size());
final List<V> col2 = new ArrayList<V>(column.size());
bundle.appendColumn(type1, col1);
bundle.appendColumn(type2, col2);
// Build other dimensions array.
int[] odims = new int[vtype.dimensionality() - dims.length];
{
int i = 0;
for(int d = 1; d <= vtype.dimensionality(); d++) {
boolean found = false;
for(int j = 0; j < dims.length; j++) {
if(dims[j] == d) {
found = true;
break;
}
}
if(!found) {
if(i >= odims.length) {
throw new AbortException("Dimensionalities not proper!");
}
odims[i] = d;
i++;
}
}
}
// Normalization scan
for(int i = 0; i < objects.dataLength(); i++) {
@SuppressWarnings("unchecked")
final V obj = (V) column.get(i);
double[] part1 = new double[dims.length];
double[] part2 = new double[obj.getDimensionality() - dims.length];
for(int d = 0; d < dims.length; d++) {
part1[d] = obj.doubleValue(dims[d]);
}
for(int d = 0; d < odims.length; d++) {
part2[d] = obj.doubleValue(odims[d]);
}
col1.add(obj.newInstance(part1));
col2.add(obj.newInstance(part2));
}
}
return bundle;
}
/**
* The input type we use.
*
* @return type information
*/
private TypeInformation getInputTypeRestriction() {
// Find maximum dimension requested
int m = dims[0];
for(int i = 1; i < dims.length; i++) {
m = Math.max(dims[i], m);
}
return new VectorFieldTypeInformation<NumberVector<?, ?>>(NumberVector.class, m, Integer.MAX_VALUE);
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer<V extends NumberVector<V, ?>> extends AbstractParameterizer {
/**
* The parameter listing the split dimensions.
*/
public static final OptionID SELECTED_ATTRIBUTES_ID = OptionID.getOrCreateOptionID("split.dims", "Dimensions to split into the first relation.");
/**
* Dimensions to use.
*/
protected int[] dims;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
IntListParameter selectedAttributesP = new IntListParameter(SELECTED_ATTRIBUTES_ID, new ListGreaterEqualConstraint<Integer>(1));
if(config.grab(selectedAttributesP)) {
List<Integer> dimensionList = selectedAttributesP.getValue();
dims = new int[dimensionList.size()];
for(int i = 0; i < dimensionList.size(); i++) {
dims[i] = dimensionList.get(i);
}
}
}
@Override
protected SplitNumberVectorFilter<V> makeInstance() {
return new SplitNumberVectorFilter<V>(dims);
}
}
}
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