/*
* RapidMiner
*
* Copyright (C) 2001-2011 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* 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/.
*/
package com.rapidminer.operator.preprocessing.filter;
import java.util.LinkedHashMap;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeSet;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.table.AttributeFactory;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.annotation.ResourceConsumptionEstimator;
import com.rapidminer.operator.ports.metadata.AttributeMetaData;
import com.rapidminer.operator.ports.metadata.ExampleSetMetaData;
import com.rapidminer.operator.ports.metadata.SetRelation;
import com.rapidminer.operator.preprocessing.AbstractValueProcessing;
import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.OperatorResourceConsumptionHandler;
/**
* This operator creates new attributes from nominal attributes where
* the new attributes contain the trimmed original values, i.e. leading
* and trailing spaces will be removed.
*
* @author Ingo Mierswa, Helge Homburg, Tobias Malbrecht
*/
public class AttributeValueTrim extends AbstractValueProcessing {
public AttributeValueTrim(OperatorDescription description) {
super(description);
}
@Override
public ExampleSet applyOnFiltered(ExampleSet exampleSet) throws OperatorException {
LinkedHashMap<Attribute, Attribute> attributeMap = new LinkedHashMap<Attribute, Attribute>();
for (Attribute oldAttribute : exampleSet.getAttributes()) {
Attribute newAttribute = AttributeFactory.createAttribute(oldAttribute.getValueType());
attributeMap.put(oldAttribute, newAttribute);
for (String value : oldAttribute.getMapping().getValues()) {
String trimmedValue = value.trim();
if (trimmedValue.length() > 0) {
newAttribute.getMapping().mapString(trimmedValue);
}
}
}
for (Entry<Attribute, Attribute> entry : attributeMap.entrySet()) {
Attribute oldAttribute = entry.getKey();
Attribute newAttribute = entry.getValue();
exampleSet.getExampleTable().addAttribute(newAttribute);
exampleSet.getAttributes().addRegular(newAttribute);
for (Example example : exampleSet) {
double value = example.getValue(oldAttribute);
if (Double.isNaN(value)) {
example.setValue(newAttribute, Double.NaN);
} else {
String trimmedValue = oldAttribute.getMapping().mapIndex((int) value).trim();
if (trimmedValue.length() == 0) {
example.setValue(newAttribute, Double.NaN);
} else {
example.setValue(newAttribute, newAttribute.getMapping().mapString(trimmedValue));
}
}
}
exampleSet.getAttributes().remove(oldAttribute);
newAttribute.setName(oldAttribute.getName());
}
return exampleSet;
}
@Override
public ExampleSetMetaData applyOnFilteredMetaData(ExampleSetMetaData emd) {
for (AttributeMetaData amd : emd.getAllAttributes()) {
Set<String> valueSet = new TreeSet<String>();
for (String value : amd.getValueSet()) {
String trimmedValue = value.trim();
if (trimmedValue.length() > 0) {
valueSet.add(trimmedValue);
}
}
amd.setValueSet(valueSet, SetRelation.SUBSET);
}
return emd;
}
@Override
protected int[] getFilterValueTypes() {
return new int[] { Ontology.NOMINAL };
}
@Override
public boolean writesIntoExistingData() {
return false;
}
@Override
public ResourceConsumptionEstimator getResourceConsumptionEstimator() {
return OperatorResourceConsumptionHandler.getResourceConsumptionEstimator(getInputPort(), AttributeValueTrim.class, null);
}
}