/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.addons.hbase.common;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.util.Base64;
/**
* Utility for {@link TableInputFormat}
*/
public class HBaseUtil {
/**
* Writes the given scan into a Base64 encoded string.
*
* @param scan
* The scan to write out.
* @return The scan saved in a Base64 encoded string.
* @throws IOException
* When writing the scan fails.
*/
static String convertScanToString(Scan scan) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(out);
scan.write(dos);
return Base64.encodeBytes(out.toByteArray());
}
/**
* Converts the given Base64 string back into a Scan instance.
*
* @param base64
* The scan details.
* @return The newly created Scan instance.
* @throws IOException
* When reading the scan instance fails.
*/
public static Scan convertStringToScan(String base64) throws IOException {
ByteArrayInputStream bis = new ByteArrayInputStream(Base64.decode(base64));
DataInputStream dis = new DataInputStream(bis);
Scan scan = new Scan();
scan.readFields(dis);
return scan;
}
}