moa.classifiers.rules.Predicates.java Source code

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Here is the source code for moa.classifiers.rules.Predicates.java

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/*
 *    Predicates.java
 *    Copyright (C) 2012 University of Porto, Portugal
 *    @author P. Kosina, E. Almeida, J. Gama
 *
 *    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 moa.classifiers.rules;

/**
 * Class that creates and evaluates the predicates
 * 
 * <p>Learning Decision Rules from Data Streams, IJCAI 2011, J. Gama,  P. Kosina </p>
 *
 * @author P. Kosina, E. Almeida, J. Gama
 * @version $Revision: 2 $
 * 
 */

import moa.AbstractMOAObject;
import weka.core.Instance;
//import samoa.instances.Instance;

public class Predicates extends AbstractMOAObject {

    private static final long serialVersionUID = 1L;

    private double attributeValue;

    private double symbol;

    private double value;

    public Predicates(double attribVal, double symb, double val) {
        this.attributeValue = attribVal;
        this.symbol = symb;
        this.value = val;
    }

    public double getAttributeValue() {
        return this.attributeValue;
    }

    public double getSymbol() {
        return this.symbol;
    }

    public double getValue() {
        return this.value;
    }

    public void setAttributeValue(double attributeValue) {
        this.attributeValue = attributeValue;
    }

    public void setSymbol(double symbol) {
        this.symbol = symbol;
    }

    public void setValue(double value) {
        this.value = value;
    }

    public boolean evaluate(Instance inst) {
        boolean result = false;
        double attributeValue = inst.value((int) this.attributeValue);
        if (this.symbol == 0.0 && attributeValue == this.value) {
            result = true;
        } else if (this.symbol == -1.0 && attributeValue <= this.value) {
            result = true;
        } else if (this.symbol == 1.0 && attributeValue > this.value) {
            result = true;
        }
        return result;
    }

    @Override
    public void getDescription(StringBuilder sb, int indent) {
        // TODO Auto-generated method stub

    }

}