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interface for deleting duplicates

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Athou
2013-07-08 16:38:09 +02:00
parent c8ff6e1d20
commit 52270d50d9
6 changed files with 146 additions and 2 deletions
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37
src/main/java/com/commafeed/backend/dao/FeedDAO.java
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@@ -7,10 +7,15 @@ import javax.ejb.Stateless;
import javax.persistence.Query;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import javax.persistence.criteria.SetJoin;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang.StringUtils;
@@ -26,6 +31,13 @@ import com.google.common.collect.Lists;
@Stateless
public class FeedDAO extends GenericDAO<Feed> {
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public static class FeedCount {
public String normalizedUrlHash;
public List<Feed> feeds;
}
private List<Predicate> getUpdatablePredicates(Root<Feed> root,
Date threshold) {
@@ -123,4 +135,29 @@ public class FeedDAO extends GenericDAO<Feed> {
return deleted;
}
public List<FeedCount> findDuplicates(int offset, int limit) {
CriteriaQuery<String> query = builder.createQuery(String.class);
Root<Feed> root = query.from(getType());
Path<String> hashPath = root.get(Feed_.normalizedUrlHash);
Expression<Long> count = builder.count(hashPath);
query.select(hashPath);
query.groupBy(hashPath);
query.having(builder.greaterThan(count, 1l));
TypedQuery<String> q = em.createQuery(query);
limit(q, offset, limit);
List<String> normalizedUrlHashes = q.getResultList();
List<FeedCount> result = Lists.newArrayList();
for (String hash : normalizedUrlHashes) {
FeedCount fc = new FeedCount();
fc.normalizedUrlHash = hash;
fc.feeds = findByField(Feed_.normalizedUrlHash, hash);
}
return result;
}
}