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package it.niedermann.nextcloud.deck.ui.stack;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;
import it.niedermann.nextcloud.deck.model.Stack;
public class StackAdapter extends FragmentStateAdapter {
@NonNull
private final List<Stack> stackList = new ArrayList<>();
public StackAdapter(final FragmentActivity fa) {
super(fa);
}
@Override
public int getItemCount() {
return stackList.size();
}
public Stack getItem(int position) {
return stackList.get(position);
}
/**
* @return the position of the direct neighbour of the given {@param position} if available. Prefers neighbours to the start of the wanted, but might also return a neighbour to the end.
* @throws NoSuchElementException in case this is the only {@link Stack}.
*/
public int getNeighbourPosition(int position) throws NoSuchElementException, IndexOutOfBoundsException {
if (position >= stackList.size()) {
throw new IndexOutOfBoundsException("Position " + position + " is not in the current stack list.");
}
if (stackList.size() < 2) {
throw new NoSuchElementException("There is no neighbour.");
}
return position > 0
? position - 1
: position + 1;
}
/**
* @return the position of the {@link Stack} where {@link Stack#getLocalId()} equals {@param stackLocalId}.
* @throws NoSuchElementException in case the searched {@param stackLocalId} is not in the list.
*/
public int getPosition(long stackLocalId) throws NoSuchElementException {
for (int i = 0; i < stackList.size(); i++) {
if (stackList.get(i).getLocalId() == stackLocalId) {
return i;
}
}
throw new NoSuchElementException("Stack with localId " + stackLocalId + " is not in the current list.");
}
@Override
public long getItemId(int position) {
return stackList.get(position).getLocalId();
}
@Override
public boolean containsItem(long itemId) {
for (final var stack : stackList) {
if (stack.getLocalId() == itemId) {
return true;
}
}
return false;
}
@NonNull
@Override
public Fragment createFragment(int position) {
return StackFragment.newInstance(stackList.get(position).getLocalId());
}
public void setStacks(@NonNull List<Stack> stacks) {
this.stackList.clear();
this.stackList.addAll(stacks);
notifyDataSetChanged();
}
}
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