api method to export opml (#64)

src/main/java/com/commafeed/backend/feeds/OPMLExporter.java

@@ -0,0 +1,87 @@
+package com.commafeed.backend.feeds;
+
+import java.util.Calendar;
+import java.util.List;
+
+import javax.ejb.Stateless;
+import javax.inject.Inject;
+
+import com.commafeed.backend.dao.FeedCategoryDAO;
+import com.commafeed.backend.dao.FeedSubscriptionDAO;
+import com.commafeed.backend.model.FeedCategory;
+import com.commafeed.backend.model.FeedSubscription;
+import com.commafeed.backend.model.User;
+import com.sun.syndication.feed.opml.Attribute;
+import com.sun.syndication.feed.opml.Opml;
+import com.sun.syndication.feed.opml.Outline;
+
+@Stateless
+public class OPMLExporter {
+
+	@Inject
+	FeedCategoryDAO feedCategoryDAO;
+
+	@Inject
+	FeedSubscriptionDAO feedSubscriptionDAO;
+
+	@SuppressWarnings("unchecked")
+	public Opml export(User user) {
+		Opml opml = new Opml();
+		opml.setFeedType("opml_1.0");
+		opml.setTitle(String.format("%s subscriptions in CommaFeed",
+				user.getName()));
+		opml.setCreated(Calendar.getInstance().getTime());
+
+		List<FeedCategory> categories = feedCategoryDAO.findAll(user);
+		List<FeedSubscription> subscriptions = feedSubscriptionDAO
+				.findAll(user);
+
+		for (FeedCategory cat : categories) {
+			opml.getOutlines().add(buildCategoryOutline(cat, subscriptions));
+		}
+		for (FeedSubscription sub : subscriptions) {
+			if (sub.getCategory() == null) {
+				opml.getOutlines().add(buildSubscriptionOutline(sub));
+			}
+		}
+
+		return opml;
+
+	}
+
+	@SuppressWarnings("unchecked")
+	private Outline buildCategoryOutline(FeedCategory cat,
+			List<FeedSubscription> subscriptions) {
+		Outline outline = new Outline();
+		outline.setText(cat.getName());
+		outline.setTitle(cat.getName());
+
+		for (FeedCategory child : cat.getChildren()) {
+			outline.getChildren().add(
+					buildCategoryOutline(child, subscriptions));
+		}
+
+		for (FeedSubscription sub : subscriptions) {
+			if (sub.getCategory() != null
+					&& sub.getCategory().getId().equals(cat.getId())) {
+				outline.getChildren().add(buildSubscriptionOutline(sub));
+			}
+		}
+		return outline;
+	}
+
+	@SuppressWarnings("unchecked")
+	private Outline buildSubscriptionOutline(FeedSubscription sub) {
+		Outline outline = new Outline();
+		outline.setText(sub.getTitle());
+		outline.setTitle(sub.getTitle());
+		outline.setType("rss");
+		outline.getAttributes().add(
+				new Attribute("xmlUrl", sub.getFeed().getUrl()));
+		if (sub.getFeed().getLink() != null) {
+			outline.getAttributes().add(
+					new Attribute("htmlUrl", sub.getFeed().getLink()));
+		}
+		return outline;
+	}
+}