/**
* 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.gora.accumulo.query;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map.Entry;
import org.apache.accumulo.core.client.RowIterator;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.data.ByteSequence;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.gora.accumulo.store.AccumuloStore;
import org.apache.gora.persistency.impl.PersistentBase;
import org.apache.gora.query.Query;
import org.apache.gora.query.impl.ResultBase;
import org.apache.gora.store.DataStore;
/**
*
*/
public class AccumuloResult<K,T extends PersistentBase> extends ResultBase<K,T> {
private RowIterator iterator;
public AccumuloStore<K,T> getDataStore() {
return (AccumuloStore<K,T>) super.getDataStore();
}
/**
* @param dataStore
* @param query
* @param scanner
*/
public AccumuloResult(DataStore<K,T> dataStore, Query<K,T> query, Scanner scanner) {
super(dataStore, query);
// TODO set batch size based on limit, and construct iterator later
iterator = new RowIterator(scanner.iterator());
}
@Override
public float getProgress() throws IOException {
// TODO Auto-generated method stub
return 0;
}
@Override
public void close() throws IOException {
}
@Override
protected boolean nextInner() throws IOException {
if (!iterator.hasNext())
return false;
key = null;
Iterator<Entry<Key,Value>> nextRow = iterator.next();
ByteSequence row = getDataStore().populate(nextRow, persistent);
key = (K) ((AccumuloStore<K, T>) dataStore).fromBytes(getKeyClass(), row.toArray());
return true;
}
}