Example usage for org.apache.mahout.cf.taste.common NoSuchItemException NoSuchItemException

Introduction

In this page you can find the example usage for org.apache.mahout.cf.taste.common NoSuchItemException NoSuchItemException.

Prototype

public NoSuchItemException() 

Source Link

Usage

From source file:alto.plugin.webradio.recommender.MongoDBDataModel.java

License:Apache License

private void checkData(String userID, Iterable<List<String>> items, boolean add)
        throws NoSuchUserException, NoSuchItemException {
    Preconditions.checkNotNull(userID);//from   w w  w . j  a v  a  2  s  . com
    Preconditions.checkNotNull(items);
    Preconditions.checkArgument(!userID.isEmpty(), "userID is empty");
    for (List<String> item : items) {
        Preconditions.checkNotNull(item.get(0));
        Preconditions.checkArgument(!item.get(0).isEmpty(), "item is empty");
    }
    if (userIsObject && !ID_PATTERN.matcher(userID).matches()) {
        throw new IllegalArgumentException();
    }
    for (List<String> item : items) {
        if (itemIsObject && !ID_PATTERN.matcher(item.get(0)).matches()) {
            throw new IllegalArgumentException();
        }
    }
    if (!add && !isIDInModel(userID)) {
        throw new NoSuchUserException();
    }
    for (List<String> item : items) {
        if (!add && !isIDInModel(item.get(0))) {
            throw new NoSuchItemException();
        }
    }
}

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From source file:com.paradigma.recommender.db.MongoDBDataModel.java

License:Apache License

private void checkData(String userID, Iterable<List<String>> items, boolean add)
        throws NoSuchUserException, NoSuchItemException {
    Preconditions.checkNotNull(userID);/*  w ww .  ja v a 2  s  .  c o m*/
    Preconditions.checkNotNull(items);
    Preconditions.checkArgument(userID.length() > 0);
    for (List<String> item : items) {
        Preconditions.checkNotNull(item.get(0));
        Preconditions.checkArgument(item.get(0).length() > 0);
    }
    if (userIsObject && !ID_PATTERN.matcher(userID).matches()) {
        throw new IllegalArgumentException();
    }
    for (List<String> item : items) {
        if (itemIsObject && !ID_PATTERN.matcher(item.get(0)).matches()) {
            throw new IllegalArgumentException();
        }
    }
    if (!add && !isIDInModel(userID)) {
        throw new NoSuchUserException();
    }
    for (List<String> item : items) {
        if (!add && !isIDInModel(item.get(0))) {
            throw new NoSuchItemException();
        }
    }
}

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From source file:edu.uci.ics.sourcerer.ml.db.AbstractJDBCUserSimilarity.java

License:Open Source License

@Override
public double userSimilarity(long userID1, long userID2) throws TasteException {

    if (userID1 == userID2) {
        return 1.0;
    }// w ww.  jav a  2 s  .c  o m
    // Order as smaller - larger
    if (userID1 > userID2) {
        long temp = userID1;
        userID1 = userID2;
        userID2 = temp;
    }

    Connection conn = null;
    PreparedStatement stmt = null;
    ResultSet rs = null;

    try {
        conn = dataSource.getConnection();
        stmt = conn.prepareStatement(getUserUserSimilaritySQL, ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY);
        stmt.setFetchDirection(ResultSet.FETCH_FORWARD);
        stmt.setFetchSize(getFetchSize());
        stmt.setLong(1, userID1);
        stmt.setLong(2, userID2);

        log.debug("Executing SQL query: {}", getUserUserSimilaritySQL);
        rs = stmt.executeQuery();

        if (rs.next()) {
            return rs.getDouble(1);
        } else {
            throw new NoSuchItemException();
        }

    } catch (SQLException sqle) {
        log.warn("Exception while retrieving user", sqle);
        throw new TasteException(sqle);
    } finally {
        IOUtils.quietClose(rs, stmt, conn);
    }
}

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