SectionAndItem<T> getSectionAndItem(int position) {
if (sectionKeys.size() == 0) {
return null;
}
String sectionKey = null;
T graphObject = null;
if (!displaySections) {
sectionKey = sectionKeys.get(0);
List<T> section = graphObjectsBySection.get(sectionKey);
if (position >= 0 && position < section.size()) {
graphObject = graphObjectsBySection.get(sectionKey).get(position);
} else {
// We are off the end; we must be adding an activity circle to indicate more data is coming.
assert dataNeededListener != null && cursor.areMoreObjectsAvailable();
// We return null for both to indicate this.
return new SectionAndItem<T>(null, null);
}
} else {
// Count through the sections; the "0" position in each section is the header. We decrement
// position each time we skip forward a certain number of elements, including the header.
for (String key : sectionKeys) {
// Decrement if we skip over the header
if (position-- == 0) {
sectionKey = key;
break;
}
List<T> section = graphObjectsBySection.get(key);
if (position < section.size()) {
// The position is somewhere in this section. Get the corresponding graph object.
sectionKey = key;
graphObject = section.get(position);
break;
}
// Decrement by as many items as we skipped over
position -= section.size();
}
}
if (sectionKey != null) {
// Note: graphObject will be null if this represents a section header.
return new SectionAndItem<T>(sectionKey, graphObject);
} else {
throw new IndexOutOfBoundsException("position");
}
}
@Override
public int getPositionForSection(int section) {
if (displaySections) {
section = Math.max(0, Math.min(section, sectionKeys.size() - 1));
if (section < sectionKeys.size()) {
return getPosition(sectionKeys.get(section), null);
}
}
return 0;
}