/**
* 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.lazy;
import org.apache.hadoop.hive.serde2.io.ByteWritable;
import org.apache.hadoop.hive.serde2.lazy.objectinspector.primitive.LazyByteObjectInspector;
/**
* LazyObject for storing a value of Byte.
*
* <p>
* Part of the code is adapted from Apache Harmony Project.
*
* As with the specification, this implementation relied on code laid out in <a
* href="http://www.hackersdelight.org/">Henry S. Warren, Jr.'s Hacker's
* Delight, (Addison Wesley, 2002)</a> as well as <a
* href="http://aggregate.org/MAGIC/">The Aggregate's Magic Algorithms</a>.
* </p>
*
*/
public class LazyByte extends LazyPrimitive<LazyByteObjectInspector, ByteWritable> {
public LazyByte(LazyByteObjectInspector oi) {
super(oi);
data = new ByteWritable();
}
public LazyByte(LazyByte copy) {
super(copy);
data = new ByteWritable(copy.data.get());
}
@Override
public void init(ByteArrayRef bytes, int start, int length) {
try {
data.set(parseByte(bytes.getData(), start, length, 10));
isNull = false;
} catch (NumberFormatException e) {
isNull = true;
}
}
/**
* Parses the string argument as if it was a byte value and returns the
* result. Throws NumberFormatException if the string does not represent a
* single byte quantity.
*
* @param bytes
* @param start
* @param length
* a UTF-8 encoded string representation of a single byte quantity.
* @return byte the value represented by the argument
* @throws NumberFormatException
* if the argument could not be parsed as a byte quantity.
*/
public static byte parseByte(byte[] bytes, int start, int length) throws NumberFormatException {
return parseByte(bytes, start, length, 10);
}
/**
* Parses the string argument as if it was a byte value and returns the
* result. Throws NumberFormatException if the string does not represent a
* single byte quantity. The second argument specifies the radix to use when
* parsing the value.
*
* @param bytes
* @param start
* @param length
* a UTF-8 encoded string representation of a single byte quantity.
* @param radix
* the radix to use when parsing.
* @return byte the value represented by the argument
* @throws NumberFormatException
* if the argument could not be parsed as a byte quantity.
*/
public static byte parseByte(byte[] bytes, int start, int length, int radix)
throws NumberFormatException {
int intValue = LazyInteger.parseInt(bytes, start, length, radix);
byte result = (byte) intValue;
if (result == intValue) {
return result;
}
throw new NumberFormatException();
}
}