/*
* ARX: Powerful Data Anonymization
* Copyright 2012 - 2016 Florian Kohlmayer, Fabian Prasser
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.deidentifier.arx.aggregates.classification;
import java.util.Date;
import org.deidentifier.arx.DataType;
import org.deidentifier.arx.DataType.ARXDate;
import org.deidentifier.arx.DataType.ARXDecimal;
import org.deidentifier.arx.DataType.ARXInteger;
/**
* Metadata about a single feature
* @author Fabian Prasser
*
*/
public class ClassificationFeatureMetadata {
/** Attribute */
private final String attribute;
/** Maximum */
private double maximum = -Double.MAX_VALUE;
/** Minimum */
private double minimum = Double.MAX_VALUE;
/** Data type */
private final DataType<?> type;
/**
* Creates a new instance
* @param attribute
* @param type
*/
public ClassificationFeatureMetadata(String attribute, DataType<?> type) {
this.attribute = attribute;
this.type = type;
}
/**
* Returns the name of the feature
* @return
*/
public String getName() {
return this.attribute;
}
/**
* Returns whether this is a numeric attribute
* @return
*/
public boolean isNumeric() {
return minimum != Double.MAX_VALUE || maximum != - Double.MAX_VALUE;
}
/**
* Updates minimum and maximum for feature scaling
* @param value
*/
protected void updateMinMax(String value) {
// Convert
double numericValue = Double.NaN;
try {
if (type instanceof ARXDecimal) {
numericValue = 0d;
numericValue = (Double) type.parse(value);
} else if (type instanceof ARXInteger) {
numericValue = 0d;
numericValue = (Long) type.parse(value);
} else if (type instanceof ARXDate) {
numericValue = 0d;
numericValue = ((Date) type.parse(value)).getTime();
}
} catch (Exception e) {
// Ignore: this is for the handling of suppressed values
}
// Trace
if (!Double.isNaN(numericValue)) {
minimum = Math.min(minimum, numericValue);
maximum = Math.max(maximum, numericValue);
}
}
}