org.apache.crunch.io.hbase.HTableIterator.java Source code

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Here is the source code for org.apache.crunch.io.hbase.HTableIterator.java

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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.crunch.io.hbase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.crunch.Pair;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;

import java.io.IOException;
import java.util.Iterator;

class HTableIterator implements Iterator<Pair<ImmutableBytesWritable, Result>> {
    private static final Log LOG = LogFactory.getLog(HTableIterator.class);

    private final HTable table;
    private final ResultScanner scanner;
    private final Iterator<Result> iter;

    public HTableIterator(HTable table, ResultScanner scanner) {
        this.table = table;
        this.scanner = scanner;
        this.iter = scanner.iterator();
    }

    @Override
    public boolean hasNext() {
        boolean hasNext = iter.hasNext();
        if (!hasNext) {
            scanner.close();
            try {
                table.close();
            } catch (IOException e) {
                LOG.error("Exception closing HTable: " + table.getTableName(), e);
            }
        }
        return hasNext;
    }

    @Override
    public Pair<ImmutableBytesWritable, Result> next() {
        Result next = iter.next();
        return Pair.of(new ImmutableBytesWritable(next.getRow()), next);
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }
}