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package tim.prune.function.compress;
import tim.prune.data.DataPoint;
import tim.prune.data.Field;
import tim.prune.data.FieldList;
/**
* Comparison of waypoints for duplicate identification
*/
public class WaypointComparer
{
/** Possible results of comparison */
public enum CompareResult {
IDENTICAL, FIRST_BETTER, SECOND_BETTER, COMPLEMENTARY, DIFFERENT
}
/**
* Compare two waypoints
* @param inFirst first waypoint
* @param inSecond second waypoint
* @return enum value to describe if the points are identical / complementary or if one is better
*/
public static CompareResult compare(DataPoint inFirst, DataPoint inSecond)
{
if (!inFirst.isWaypoint() || !inSecond.isWaypoint()
|| !inFirst.getWaypointName().equals(inSecond.getWaypointName()))
{
// Comparing waypoint with non-waypoint or differently named waypoints
return CompareResult.DIFFERENT;
}
boolean firstHasExtraField = false, secondHasExtraField = false;
FieldList allFields = inFirst.getFieldList().merge(inSecond.getFieldList());
for (int f=0; f<allFields.getNumFields(); f++)
{
Field field = allFields.getField(f);
String firstValue = inFirst.getFieldValue(field);
String secondValue = inSecond.getFieldValue(field);
boolean hasFirst = hasValue(firstValue);
boolean hasSecond = hasValue(secondValue);
if (hasFirst && !hasSecond) {
firstHasExtraField = true;
}
else if (!hasFirst && hasSecond) {
secondHasExtraField = true;
}
else if (hasFirst && hasSecond
&& !firstValue.equals(secondValue)) {
return CompareResult.DIFFERENT;
}
}
// Now check which point has more fields
if (!firstHasExtraField && !secondHasExtraField) {
return CompareResult.IDENTICAL;
}
if (firstHasExtraField && !secondHasExtraField) {
return CompareResult.FIRST_BETTER;
}
if (!firstHasExtraField && secondHasExtraField) {
return CompareResult.SECOND_BETTER;
}
return CompareResult.COMPLEMENTARY; // both have fields which the other doesn't
}
/**
* @return true if the given string has something in it
*/
private static boolean hasValue(String inValue) {
return inValue != null && !inValue.isEmpty();
}
}
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