org.opentripplanner.model.impl.GenerateMissingIds Maven / Gradle / Ivy
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The OpenTripPlanner multimodal journey planning system
package org.opentripplanner.model.impl;
import org.opentripplanner.model.TransitEntity;
import java.util.List;
/**
* Utility class to help inserting none existing ids.
* @see #generateNoneExistentIds(List)
*/
class GenerateMissingIds {
/** private to prevent instantiation of utility class */
private GenerateMissingIds() {}
/**
* Iterate over the entities; First to find the larged numerical id, then
* set all ids that is {@code 0} or {@code null} to a uniq nuberical id.
*/
static > void generateNoneExistentIds(List entities) {
int maxId = 0;
for (T it : entities) {
maxId = Math.max(maxId, parseId(it));
}
for (T it : entities) {
if(parseId(it) == 0) {
it.setId(Integer.toString(++maxId));
}
}
}
/** pares entity id as int, if not int -1 is resturned, if 0 or null zero is returned. */
private static int parseId(TransitEntity entity) {
try {
String id = entity.getId();
return id == null ? 0 : Integer.parseInt(id);
}
catch (NumberFormatException ignore) {
return -1;
}
}
}