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#include <mbgl/style/applied_class_properties.hpp>
namespace mbgl {
AppliedClassProperty::AppliedClassProperty(ClassID class_id, timestamp begin, timestamp end, const PropertyValue &value)
: name(class_id),
begin(begin),
end(end),
value(value) {}
// Returns thie ID of the most recent
ClassID AppliedClassProperties::mostRecent() const {
return properties.size() ? properties.back().name : ClassID::Fallback;
}
void AppliedClassProperties::add(ClassID class_id, timestamp begin, timestamp end, const PropertyValue &value) {
properties.emplace_back(class_id, begin, end, value);
}
bool AppliedClassProperties::hasTransitions() const {
return properties.size() > 1;
}
// Erase all items in the property list that are before a completed transition.
// Then, if the only remaining property is a Fallback value, remove it too.
void AppliedClassProperties::cleanup(timestamp now) {
// Iterate backwards, but without using the rbegin/rend interface since we need forward
// iterators to use .erase().
for (auto it = properties.end(), begin = properties.begin(); it != begin;) {
// If the property is finished, break iteration and delete all remaining items.
if ((--it)->end <= now) {
// Removes all items that precede the current iterator, but *not* the element currently
// pointed to by the iterator. This preserves the last completed transition as the
// first element in the property list.
properties.erase(begin, it);
// Also erase the pivot element if it's a fallback value. This means we can remove the
// entire applied properties object as well, because we already have the fallback
// value set as the default.
if (it->name == ClassID::Fallback) {
properties.erase(it);
}
break;
}
}
}
bool AppliedClassProperties::empty() const {
return properties.empty();
}
}
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