remove many to many relationship between entries and feeds

src/main/java/com/commafeed/backend/dao/FeedEntryContentDAO.java

@@ -0,0 +1,66 @@
+package com.commafeed.backend.dao;
+
+import java.util.List;
+
+import javax.persistence.TypedQuery;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Join;
+import javax.persistence.criteria.JoinType;
+import javax.persistence.criteria.Predicate;
+import javax.persistence.criteria.Root;
+
+import org.apache.commons.codec.digest.DigestUtils;
+
+import com.commafeed.backend.model.FeedEntry;
+import com.commafeed.backend.model.FeedEntryContent;
+import com.commafeed.backend.model.FeedEntryContent_;
+import com.commafeed.backend.model.FeedEntry_;
+import com.google.common.collect.Iterables;
+
+public class FeedEntryContentDAO extends GenericDAO<FeedEntryContent> {
+
+	public FeedEntryContent findExisting(FeedEntryContent content) {
+
+		CriteriaQuery<FeedEntryContent> query = builder.createQuery(getType());
+		Root<FeedEntryContent> root = query.from(getType());
+
+		Predicate p1 = builder.equal(root.get(FeedEntryContent_.contentHash),
+				DigestUtils.sha1Hex(content.getContent()));
+		Predicate p2 = null;
+		if (content.getTitle() == null) {
+			p2 = builder.isNull(root.get(FeedEntryContent_.title));
+		} else {
+			p2 = builder.equal(root.get(FeedEntryContent_.title),
+					content.getTitle());
+		}
+
+		Predicate p3 = null;
+		if (content.getAuthor() == null) {
+			p3 = builder.isNull(root.get(FeedEntryContent_.author));
+		} else {
+			p3 = builder.equal(root.get(FeedEntryContent_.author),
+					content.getAuthor());
+		}
+
+		query.where(p1, p2, p3);
+		TypedQuery<FeedEntryContent> q = em.createQuery(query);
+		return Iterables.getFirst(q.getResultList(), null);
+
+	}
+
+	public int deleteWithoutEntries(int max) {
+		CriteriaQuery<FeedEntryContent> query = builder.createQuery(getType());
+		Root<FeedEntryContent> root = query.from(getType());
+
+		Join<FeedEntryContent, FeedEntry> join = root.join(
+				FeedEntryContent_.entries, JoinType.LEFT);
+		query.where(builder.isNull(join.get(FeedEntry_.id)));
+		TypedQuery<FeedEntryContent> q = em.createQuery(query);
+		q.setMaxResults(max);
+
+		List<FeedEntryContent> list = q.getResultList();
+		int deleted = list.size();
+		return deleted;
+
+	}
+}