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package org.gvsig.legend.aggregate.lib.impl.operation;

import java.text.MessageFormat;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.legend.aggregate.lib.api.AbstractOperation;

public class SumOperation extends AbstractOperation {

    int sum = 0;

    public SumOperation() {

        super("_Sum", "_Calculate_the_sum_of_the_selected_attribute_for_the_grouped_features");

    }

    @Override

    public boolean isAttributeRequiered() {

        return true;

    }

    @Override

    public boolean isAditionalValueRequiered() {

        return true;

    }

    @Override

    public void reset() {

        sum = 0;

    }

    @Override

    public void perform(Feature feature) {

        try {

            double x = feature.getDouble(this.getAttributeName());

            sum += x;

        } catch (Exception ex) {

        }

    }

    @Override

    public Object getValue() {

        return sum;

    }

    @Override

    public String format() {

        if( StringUtils.isEmpty(this.getAditionalValue()) ) {

            return super.format(); 

        }

        try {

            return MessageFormat.format("{0,number,"+this.getAditionalValue().trim()+"}", this.getValue());

        } catch(Exception ex) {

            return super.format(); 

        }

    }    

}