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package com.wcohen.ss;
import com.wcohen.ss.api.*;
import java.util.*;
/**
* StringDistance defined over Strings that are broken into fields,
* with distance defined as the average distance between any field.
*/
public class MultiStringAvgDistance extends MultiStringDistance
{
private StringDistance innerDistance;
public MultiStringAvgDistance(StringDistance distance, String delim) {
super(delim);
this.innerDistance = distance;
}
/** Combine the scores for each primitive distance function on each field. */
protected double scoreCombination(double[] multiScore) {
double sum = 0.0;
for (int i=0; i<multiScore.length; i++) {
sum += multiScore[i];
}
return sum/multiScore.length;
}
/** Explain how to combine the scores for each primitive distance
* function on each field. */
protected String explainScoreCombination(double[] multiScore) {
StringBuffer buf = new StringBuffer("");
PrintfFormat fmt = new PrintfFormat(" %.3f");
buf.append("field-level scores [");
for (int i=0; i<multiScore.length; i++) {
buf.append(fmt.sprintf(multiScore[i]));
}
buf.append("] Average score:");
buf.append(fmt.sprintf( scoreCombination(multiScore) ));
return buf.toString();
}
protected StringDistance getDistance(int i) {
return innerDistance;
}
static public void main(String[] argv) {
doMain(new MultiStringAvgDistance( new JaroWinkler(), ":" ), argv);
}
}
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