org.apache.hadoop.hive.serde2.lazydio.LazyDioDouble Maven / Gradle / Ivy
/**
* 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.hadoop.hive.serde2.lazydio;
import java.io.DataInputStream;
import java.io.IOException;
import org.apache.hadoop.hive.serde2.ByteStream;
import org.apache.hadoop.hive.serde2.lazy.ByteArrayRef;
import org.apache.hadoop.hive.serde2.lazy.LazyDouble;
import org.apache.hadoop.hive.serde2.lazy.objectinspector.primitive.LazyDoubleObjectInspector;
/**
* LazyDoubleBinary for storing a double value as a DoubleWritable. This class complements class
* LazyDouble. It's primary difference is the {@link #init(ByteArrayRef, int, int)} method, which
* reads the double value stored from the default binary format.
*/
public class LazyDioDouble extends LazyDouble {
private ByteStream.Input in;
private DataInputStream din;
public LazyDioDouble(LazyDoubleObjectInspector oi) {
super(oi);
}
LazyDioDouble(LazyDioDouble copy) {
super(copy);
}
/* (non-Javadoc)
* This provides a LazyDouble like class which can be initialized from data stored in a
* binary format.
*
* @see org.apache.hadoop.hive.serde2.lazy.LazyObject#init
* (org.apache.hadoop.hive.serde2.lazy.ByteArrayRef, int, int)
*/
@Override
public void init(ByteArrayRef bytes, int start, int length) {
double value = 0.0;
try {
in = new ByteStream.Input(bytes.getData(), start, length);
din = new DataInputStream(in);
value = din.readDouble();
data.set(value);
isNull = false;
} catch (IOException e) {
isNull = true;
} finally {
try {
din.close();
} catch (IOException e) {
// swallow exception
}
try {
in.close();
} catch (IOException e) {
// swallow exception
}
}
}
}