CassandraCellExtractor.java

/*
 * Copyright 2014, Stratio.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.stratio.deep.cassandra.extractor;

import java.nio.ByteBuffer;
import java.util.Map;

import com.stratio.deep.cassandra.config.CassandraDeepJobConfig;
import com.stratio.deep.cassandra.config.CellDeepJobConfig;
import com.stratio.deep.cassandra.functions.CellList2TupleFunction;
import com.stratio.deep.cassandra.util.CassandraUtils;
import com.stratio.deep.commons.entity.Cell;
import com.stratio.deep.commons.entity.Cells;
import com.stratio.deep.commons.utils.Pair;

/**
 * Concrete implementation of a CassandraRDD representing an RDD of
 * {@link com.stratio.deep.commons.entity.Cells} element.<br/>
 */
public class CassandraCellExtractor extends CassandraExtractor<Cells, CellDeepJobConfig> {

    private static final long serialVersionUID = -738528971629963221L;

    public CassandraCellExtractor() {
        this(Cells.class);
    }

    public CassandraCellExtractor(Class<Cells> entityClass) {
        super();
        this.cassandraJobConfig = new CellDeepJobConfig();
        this.transformer = new CellList2TupleFunction();
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public Cells transformElement(Pair<Map<String, ByteBuffer>, Map<String, ByteBuffer>> elem,
                                  CassandraDeepJobConfig<Cells> config) {

        Cells cells = new Cells(config.getNameSpace());
        Map<String, Cell> columnDefinitions = config.columnDefinitions();

        for (Map.Entry<String, ByteBuffer> entry : elem.left.entrySet()) {
            Cell cd = columnDefinitions.get(entry.getKey());
            cells.add(CassandraUtils.createFromByteBuffer(cd, entry.getValue()));
        }

        for (Map.Entry<String, ByteBuffer> entry : elem.right.entrySet()) {
            Cell cd = columnDefinitions.get(entry.getKey());
            if (cd == null) {
                continue;
            }

            cells.add(CassandraUtils.createFromByteBuffer(cd, entry.getValue()));
        }

        return cells;
    }

    @Override
    public Class getConfigClass() {
        return CellDeepJobConfig.class;
    }

}