briar/briar-android/src/org/briarproject/android/blogs/RssFeedAdapter.java

package org.briarproject.android.blogs;

import android.app.Activity;
import android.support.annotation.Nullable;
import android.support.v7.util.SortedList;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import org.briarproject.R;
import org.briarproject.android.util.AndroidUtils;
import org.briarproject.api.feed.Feed;
import org.briarproject.api.sync.GroupId;

import java.util.Collection;

import static android.view.View.GONE;
import static android.view.View.VISIBLE;

class RssFeedAdapter extends
		RecyclerView.Adapter<RssFeedAdapter.FeedViewHolder> {

	private SortedList<Feed> feeds = new SortedList<>(
			Feed.class, new SortedList.Callback<Feed>() {

		@Override
		public int compare(Feed a, Feed b) {
			if (a == b) return 0;
			long aTime = a.getAdded(), bTime = b.getAdded();
			if (aTime > bTime) return -1;
			if (aTime < bTime) return 1;
			return 0;
		}

		@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(Feed a, Feed b) {
			return a.getUpdated() == b.getUpdated();
		}

		@Override
		public boolean areItemsTheSame(Feed a, Feed b) {
			return a.getUrl().equals(b.getUrl()) &&
					a.getBlogId().equals(b.getBlogId()) &&
					a.getAdded() == b.getAdded();
		}
	});

	private final Activity ctx;
	private final RssFeedListener listener;

	RssFeedAdapter(Activity ctx, RssFeedListener listener) {
		this.ctx = ctx;
		this.listener = listener;
	}

	@Override
	public FeedViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
		View v = LayoutInflater.from(ctx).inflate(
				R.layout.list_item_rss_feed, parent, false);
		return new FeedViewHolder(v);
	}

	@Override
	public void onBindViewHolder(FeedViewHolder ui, int position) {
		final Feed item = getItem(position);

		// Feed Title
		if (item.getTitle() != null) {
			ui.title.setText(item.getTitle());
			ui.title.setVisibility(VISIBLE);
		} else {
			ui.title.setVisibility(GONE);
		}

		// Delete Button
		ui.delete.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				listener.onDeleteClick(item);
			}
		});

		// Author
		if (item.getAuthor() != null) {
			ui.author.setText(item.getAuthor());
			ui.author.setVisibility(VISIBLE);
			ui.authorLabel.setVisibility(VISIBLE);
		} else {
			ui.author.setVisibility(GONE);
			ui.authorLabel.setVisibility(GONE);
		}

		// Imported and Last Updated
		ui.imported.setText(AndroidUtils.formatDate(ctx, item.getAdded()));
		ui.updated.setText(AndroidUtils.formatDate(ctx, item.getUpdated()));

		// Description
		if (item.getDescription() != null) {
			ui.description.setText(item.getDescription());
			ui.description.setVisibility(VISIBLE);
		} else {
			ui.description.setVisibility(GONE);
		}
	}

	@Override
	public int getItemCount() {
		return feeds.size();
	}

	public Feed getItem(int position) {
		return feeds.get(position);
	}

	@Nullable
	public Feed getItem(GroupId g) {
		for (int i = 0; i < feeds.size(); i++) {
			Feed item = feeds.get(i);
			if (item.getBlogId().equals(g)) {
				return item;
			}
		}
		return null;
	}

	public void addAll(Collection<Feed> items) {
		feeds.addAll(items);
	}

	public void remove(Feed item) {
		feeds.remove(item);
	}

	public void clear() {
		feeds.clear();
	}

	public boolean isEmpty() {
		return feeds.size() == 0;
	}

	static class FeedViewHolder extends RecyclerView.ViewHolder {
		private final TextView title;
		private final ImageView delete;
		private final TextView imported;
		private final TextView updated;
		private final TextView author;
		private final TextView authorLabel;
		private final TextView description;

		FeedViewHolder(View v) {
			super(v);

			title = (TextView) v.findViewById(R.id.titleView);
			delete = (ImageView) v.findViewById(R.id.deleteButton);
			imported = (TextView) v.findViewById(R.id.importedView);
			updated = (TextView) v.findViewById(R.id.updatedView);
			author = (TextView) v.findViewById(R.id.authorView);
			authorLabel = (TextView) v.findViewById(R.id.author);
			description = (TextView) v.findViewById(R.id.descriptionView);
		}
	}

	interface RssFeedListener {
		void onDeleteClick(Feed feed);
	}

}