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Camel Apache Kudu support
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.kudu;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.kudu.ColumnSchema;
import org.apache.kudu.client.KuduClient;
import org.apache.kudu.client.KuduException;
import org.apache.kudu.client.KuduScanner;
import org.apache.kudu.client.KuduScannerIterator;
import org.apache.kudu.client.KuduTable;
import org.apache.kudu.client.RowResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class KuduUtils {

    private static final Logger LOG = LoggerFactory.getLogger(KuduUtils.class);

    private KuduUtils() {
    }

    /**
     * Convert results to a more Java friendly type
     */
    public static List> scannerToList(KuduTable table, KuduScanner scanner) {
        KuduScannerIterator it = scanner.iterator();
        List> res = new ArrayList>();
        while (it.hasNext()) {
            RowResult row = it.next();
            Map r = new HashMap();
            res.add(r);
            for (ColumnSchema columnSchema : table.getSchema().getColumns()) {
                final String name = columnSchema.getName();
                r.put(name, row.getObject(name));
            }
        }
        return res;
    }

    public static List> doScan(String tableName, KuduClient connection) throws KuduException {
        LOG.trace("Scanning table {}", tableName);
        KuduTable table = connection.openTable(tableName);

        List projectColumns = new ArrayList<>(1);

        for (ColumnSchema columnSchema : table.getSchema().getColumns()) {
            projectColumns.add(columnSchema.getName());
        }

        KuduScanner scanner = connection.newScannerBuilder(table)
                .setProjectedColumnNames(projectColumns)
                .build();
        return KuduUtils.scannerToList(table, scanner);
    }
}