package gaknn.core;/** * Reprsents an instance of the data set *  * @author Niroshinie Dayaratne */public class Instanceimplements Copyable {        protected  Instances m_Dataset;    /** The instance's attribute values. */    protected double[] m_AttValues;    protected String m_Class;    protected int m_ClassIndex;        protected static final double DEFAULT_NUMVALUE = Double.NaN;     /** Constructor for an instance     *     * @param instance constructs an instance similar to this     */    public Instance( Instance instance) {	            m_AttValues = instance.m_AttValues;        m_Dataset = null;    }        /** Constructor for an instance     *     * @param attValues attribute values of the instance.     */    public Instance(double[]attValues ){        m_AttValues = attValues;        m_Dataset = null;    }        /** Constructor for an instance     *     * @param numAttributes the number of attributes of the instance     */    public Instance(int numAttributes)    {        m_AttValues = new double[numAttributes];        for (int i = 0; i < numAttributes; i++) {            m_AttValues[i] = DEFAULT_NUMVALUE;        }                m_Dataset = null;    }        /** Returns the dataset instance belongs to     *     * @return data set of the instance.     */    public Instances dataset() {        return m_Dataset;    }	    /** Adds an element to the instance.     *     * @param value of the attribute.     * @param index of the attribute.     */    public void AddElement(double value, int index){        m_AttValues[index] = value;    }        /** Returns the element at the given position     *     * @param index of the elrment.     */    public double GetElementAt(int index){        return m_AttValues[index];    }        /** returns the elements of the instance     *     * @return attribute values of the instance.     */    public double[] GetElements(){        return m_AttValues;    }    /** Sets the class value of the instance     *     * @param cls value of the instance.     */    public void SetClassVlaue(String cls){        m_Class = cls;    }    /** Returns the class value of the instance     *     * @return the class value of the instace.     */    public String GetClassValue(){        return m_Class;    }    /** Sets the class index of an instance     *     * @param index the index of the instance.     */    public void SetClassIndex(int index){        m_ClassIndex = index;    }    /** Returns the class index of the instance     *     * @return the class index of the instance     */    public int GetClassIndex(){        return m_ClassIndex;    }        /** Makes a shallow copy of the instance.     */    public /*@pure@*/ Object Copy() {        Instance result = new Instance(this);        result.m_Dataset = m_Dataset;        return result;    }}