/*
* 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.accumulo.examples.simple.filedata;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.Connector;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.client.TableNotFoundException;
import org.apache.accumulo.core.client.ZooKeeperInstance;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.core.util.PeekingIterator;
/**
* Retrieves file data based on the hash of the file. Used by the {@link org.apache.accumulo.examples.simple.dirlist.Viewer}. See README.dirlist for
* instructions.
*/
public class FileDataQuery {
private Connector conn = null;
List<Entry<Key,Value>> lastRefs;
private ChunkInputStream cis;
Scanner scanner;
public FileDataQuery(String instanceName, String zooKeepers, String user, String password, String tableName, Authorizations auths) throws AccumuloException,
AccumuloSecurityException, TableNotFoundException {
ZooKeeperInstance instance = new ZooKeeperInstance(instanceName, zooKeepers);
conn = instance.getConnector(user, password.getBytes());
lastRefs = new ArrayList<Entry<Key,Value>>();
cis = new ChunkInputStream();
scanner = conn.createScanner(tableName, auths);
}
public List<Entry<Key,Value>> getLastRefs() {
return lastRefs;
}
public ChunkInputStream getData(String hash) throws IOException {
scanner.setRange(new Range(hash));
scanner.setBatchSize(1);
lastRefs.clear();
PeekingIterator<Entry<Key,Value>> pi = new PeekingIterator<Entry<Key,Value>>(scanner.iterator());
if (pi.hasNext()) {
while (!pi.peek().getKey().getColumnFamily().equals(FileDataIngest.CHUNK_CF)) {
lastRefs.add(pi.peek());
pi.next();
}
}
cis.clear();
cis.setSource(pi);
return cis;
}
public String getSomeData(String hash, int numBytes) throws IOException {
ChunkInputStream is = getData(hash);
byte[] buf = new byte[numBytes];
if (is.read(buf) >= 0) {
return new String(buf);
} else {
return "";
}
}
}