Show Blog Invitations

This refactors the forum invitation code,
so it can be used by both: forums and blogs.

briar-android/src/org/briarproject/android/sharing/InvitationAdapter.java

@@ -0,0 +1,170 @@
+package org.briarproject.android.sharing;
+
+import android.content.Context;
+import android.support.v7.util.SortedList;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+
+import org.briarproject.R;
+import org.briarproject.android.util.TextAvatarView;
+import org.briarproject.api.contact.Contact;
+import org.briarproject.util.StringUtils;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+
+abstract class InvitationAdapter extends
+		RecyclerView.Adapter<InvitationAdapter.InvitationsViewHolder> {
+
+	protected final Context ctx;
+	private final AvailableForumClickListener listener;
+	private final SortedList<InvitationItem> invitations =
+			new SortedList<>(InvitationItem.class,
+					new SortedListCallBacks());
+
+	InvitationAdapter(Context ctx, AvailableForumClickListener listener) {
+		this.ctx = ctx;
+		this.listener = listener;
+	}
+
+	@Override
+	public InvitationsViewHolder onCreateViewHolder(ViewGroup parent,
+			int viewType) {
+
+		View v = LayoutInflater.from(ctx)
+				.inflate(R.layout.list_item_invitations, parent,  false);
+		return new InvitationsViewHolder(v);
+	}
+
+	@Override
+	public void onBindViewHolder(InvitationsViewHolder ui, int position) {
+		final InvitationItem item = getItem(position);
+
+		Collection<String> names = new ArrayList<>();
+		for (Contact c : item.getContacts()) names.add(c.getAuthor().getName());
+		ui.sharedBy.setText(ctx.getString(R.string.shared_by_format,
+				StringUtils.join(names, ", ")));
+
+		if (item.isSubscribed()) {
+			ui.subscribed.setVisibility(VISIBLE);
+		} else {
+			ui.subscribed.setVisibility(GONE);
+		}
+
+		ui.accept.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				listener.onItemClick(item, true);
+			}
+		});
+		ui.decline.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				listener.onItemClick(item, false);
+			}
+		});
+	}
+
+	@Override
+	public int getItemCount() {
+		return invitations.size();
+	}
+
+	public InvitationItem getItem(int position) {
+		return invitations.get(position);
+	}
+
+	public void add(InvitationItem item) {
+		invitations.add(item);
+	}
+
+	public void addAll(Collection<InvitationItem> list) {
+		invitations.addAll(list);
+	}
+
+	public void remove(InvitationItem item) {
+		invitations.remove(item);
+	}
+
+	public void clear() {
+		invitations.clear();
+	}
+
+	static class InvitationsViewHolder extends RecyclerView.ViewHolder {
+
+		final TextAvatarView avatar;
+		final TextView name;
+		final TextView sharedBy;
+		final TextView subscribed;
+		final Button accept;
+		final Button decline;
+
+		InvitationsViewHolder(View v) {
+			super(v);
+
+			avatar = (TextAvatarView) v.findViewById(R.id.avatarView);
+			name = (TextView) v.findViewById(R.id.forumNameView);
+			sharedBy = (TextView) v.findViewById(R.id.sharedByView);
+			subscribed = (TextView) v.findViewById(R.id.forumSubscribedView);
+			accept = (Button) v.findViewById(R.id.acceptButton);
+			decline = (Button) v.findViewById(R.id.declineButton);
+		}
+	}
+
+	abstract int compareInvitations(InvitationItem o1, InvitationItem o2);
+
+	private class SortedListCallBacks
+			extends SortedList.Callback<InvitationItem> {
+
+		@Override
+		public int compare(InvitationItem o1,
+				InvitationItem o2) {
+			return compareInvitations(o1, o2);
+		}
+
+		@Override
+		public void onInserted(int position, int count) {
+			notifyItemRangeInserted(position, count);
+		}
+
+		@Override
+		public void onRemoved(int position, int count) {
+			notifyItemRangeRemoved(position, count);
+		}
+
+		@Override
+		public void onMoved(int fromPosition, int toPosition) {
+			notifyItemMoved(fromPosition, toPosition);
+		}
+
+		@Override
+		public void onChanged(int position, int count) {
+			notifyItemRangeChanged(position, count);
+		}
+
+		@Override
+		public boolean areContentsTheSame(InvitationItem oldItem,
+				InvitationItem newItem) {
+			return oldItem.isSubscribed() == newItem.isSubscribed() &&
+					oldItem.getContacts().equals(newItem.getContacts());
+		}
+
+		@Override
+		public boolean areItemsTheSame(InvitationItem oldItem,
+				InvitationItem newItem) {
+			return oldItem.getShareable().equals(newItem.getShareable());
+		}
+	}
+
+
+	interface AvailableForumClickListener {
+		void onItemClick(InvitationItem item, boolean accept);
+	}
+}