/**
* Normalizes the tags in the tag collection <code>tc</code> before resolving tag conflicts.
*
* <p>Removes irrelevant tags like "created_by".
*
* <p>For tags which are not present on at least one of the merged nodes, the empty value "" is
* added to the list of values for this tag, but only if there are at least two primitives with
* tags, and at least one tagged primitive do not have this tag.
*
* @param tc the tag collection
* @param merged the collection of merged primitives
*/
public static void normalizeTagCollectionBeforeEditing(
TagCollection tc, Collection<? extends OsmPrimitive> merged) {
// remove irrelevant tags
//
for (String key : OsmPrimitive.getDiscardableKeys()) {
tc.removeByKey(key);
}
Collection<OsmPrimitive> taggedPrimitives = new ArrayList<>();
for (OsmPrimitive p : merged) {
if (p.isTagged()) {
taggedPrimitives.add(p);
}
}
if (taggedPrimitives.size() <= 1) return;
for (String key : tc.getKeys()) {
// make sure the empty value is in the tag set if a tag is not present
// on all merged nodes
//
for (OsmPrimitive p : taggedPrimitives) {
if (p.get(key) == null) {
tc.add(new Tag(key, "")); // add a tag with key and empty value
}
}
}
}
/**
* Completes tags in the tag collection <code>tc</code> with the empty value for each tag. If the
* empty value is present the tag conflict resolution dialog will offer an option for removing the
* tag and not only options for selecting one of the current values of the tag.
*
* @param tc the tag collection
*/
public static void completeTagCollectionForEditing(TagCollection tc) {
for (String key : tc.getKeys()) {
// make sure the empty value is in the tag set such that we can delete the tag
// in the conflict dialog if necessary
//
tc.add(new Tag(key, ""));
}
}