initial ui for entry filtering

src/main/java/com/commafeed/backend/feed/FeedEntryFilter.java

@@ -56,6 +56,7 @@ public class FeedEntryFilter {
 		};
 
 		JexlEngine engine = new JexlEngine(uberspect, null, null, null);
+		engine.setStrict(true);
 		engine.setClassLoader(cl);
 		return engine;
 	}

src/main/java/com/commafeed/backend/model/FeedSubscription.java

@@ -41,6 +41,6 @@ public class FeedSubscription extends AbstractModel {
 	private Integer position;
 
 	@Column(length = 4096)
-	private String filter = "author.contains('a')";
+	private String filter;
 
 }

src/main/java/com/commafeed/frontend/model/Subscription.java

@@ -35,6 +35,7 @@ public class Subscription implements Serializable {
 		sub.setUnread(unreadCount.getUnreadCount());
 		sub.setNewestItemTime(unreadCount.getNewestItemTime());
 		sub.setCategoryId(category == null ? null : String.valueOf(category.getId()));
+		sub.setFilter(subscription.getFilter());
 		return sub;
 	}
 
@@ -77,4 +78,7 @@ public class Subscription implements Serializable {
 	@ApiModelProperty("date of the newest item")
 	private Date newestItemTime;
 
+	@ApiModelProperty(value = "JEXL string evaluated on new entries to mark them as read if they do not match")
+	private String filter;
+
 }

src/main/java/com/commafeed/frontend/model/request/FeedModificationRequest.java

@@ -24,4 +24,7 @@ public class FeedModificationRequest implements Serializable {
 	@ApiModelProperty(value = "new display position, null if not changed")
 	private Integer position;
 
+	@ApiModelProperty(value = "JEXL string evaluated on new entries to mark them as read if they do not match")
+	private String filter;
+
 }

src/main/java/com/commafeed/frontend/resource/FeedREST.java

@@ -44,12 +44,15 @@ import com.commafeed.backend.cache.CacheService;
 import com.commafeed.backend.dao.FeedCategoryDAO;
 import com.commafeed.backend.dao.FeedEntryStatusDAO;
 import com.commafeed.backend.dao.FeedSubscriptionDAO;
+import com.commafeed.backend.feed.FeedEntryFilter;
 import com.commafeed.backend.feed.FeedFetcher;
 import com.commafeed.backend.feed.FeedQueues;
 import com.commafeed.backend.feed.FeedUtils;
 import com.commafeed.backend.feed.FetchedFeed;
 import com.commafeed.backend.model.Feed;
 import com.commafeed.backend.model.FeedCategory;
+import com.commafeed.backend.model.FeedEntry;
+import com.commafeed.backend.model.FeedEntryContent;
 import com.commafeed.backend.model.FeedEntryStatus;
 import com.commafeed.backend.model.FeedSubscription;
 import com.commafeed.backend.model.User;
@@ -93,6 +96,20 @@ import com.wordnik.swagger.annotations.ApiParam;
 @Singleton
 public class FeedREST {
 
+	private static final FeedEntry TEST_ENTRY = initTestEntry();
+
+	private static FeedEntry initTestEntry() {
+		FeedEntry entry = new FeedEntry();
+		entry.setUrl("https://github.com/Athou/commafeed");
+
+		FeedEntryContent content = new FeedEntryContent();
+		content.setAuthor("Athou");
+		content.setTitle("Merge pull request #662 from Athou/dw8");
+		content.setContent("Merge pull request #662 from Athou/dw8");
+		entry.setContent(content);
+		return entry;
+	}
+
 	private final FeedSubscriptionDAO feedSubscriptionDAO;
 	private final FeedCategoryDAO feedCategoryDAO;
 	private final FeedEntryStatusDAO feedEntryStatusDAO;
@@ -418,7 +435,15 @@ public class FeedREST {
 		Preconditions.checkNotNull(req);
 		Preconditions.checkNotNull(req.getId());
 
+		try {
+			new FeedEntryFilter(req.getFilter()).matchesEntry(TEST_ENTRY);
+		} catch (Exception e) {
+			Throwable root = Throwables.getRootCause(e);
+			return Response.status(Status.BAD_REQUEST).entity(root.getMessage()).build();
+		}
+
 		FeedSubscription subscription = feedSubscriptionDAO.findById(user, req.getId());
+		subscription.setFilter(req.getFilter());
 
 		if (StringUtils.isNotBlank(req.getName())) {
 			subscription.setTitle(req.getName());