source: trunk/CrossPare/src/de/ugoe/cs/cpdp/dataprocessing/AttributeNonRemoval.java @ 40

package de.ugoe.cs.cpdp.dataprocessing;

import java.util.ArrayList;

import org.apache.commons.collections4.list.SetUniqueList;

import weka.core.Instances;

/**
 * Removes attributes from all data sets, except the one defined, using their name. 
 * @author Fabian Trautsch
 */
public class AttributeNonRemoval implements ISetWiseProcessingStrategy, IProcessesingStrategy {

        /**
         * names of the attributes to be kept (determined by {@link #setParameter(String)}) 
         */
        private ArrayList<String> attributeNames = new ArrayList<String>();
        
        /**
         * Sets that attributes that will be kept. The string contains the blank-separated names of the attributes to be kept.
         * <br><br>
         * Note, that keeping of attributes with blanks is currently not supported!
         * @param parameters string with the blank-separated attribute names
         */
        @Override
        public void setParameter(String parameters) {
                if( parameters!=null ) {
                        String[] attributeNamesArray = parameters.split(" ");
                        for(String attributeName : attributeNamesArray) {
                                attributeNames.add(attributeName);
                        }
                }
        }

        /**
         * @see de.ugoe.cs.cpdp.dataprocessing.SetWiseProcessingStrategy#apply(weka.core.Instances, org.apache.commons.collections4.list.SetUniqueList)
         */
        @Override
        public void apply(Instances testdata, SetUniqueList<Instances> traindataSet) {
                for( String attributeName : attributeNames ) {
                        for( int i=0 ; i<testdata.numAttributes() ; i++ ) {
                                if(!attributeName.equals(testdata.attribute(i).name()) ) {
                                        testdata.deleteAttributeAt(i);
                                        for( Instances traindata : traindataSet ) {
                                                traindata.deleteAttributeAt(i);
                                        }
                                }
                        }
                }
        }

        /**
         * @see de.ugoe.cs.cpdp.dataprocessing.ProcessesingStrategy#apply(weka.core.Instances, weka.core.Instances)
         */
        @Override
        public void apply(Instances testdata, Instances traindata) {
                for(int i=testdata.numAttributes()-1; i>=0; i--) {
                        if(!attributeNames.contains(testdata.attribute(i).name())) {
                                testdata.deleteAttributeAt(i);
                                traindata.deleteAttributeAt(i);
                        }
                }
        }
}