org.apache.hadoop.hive.serde2.lazy.LazyLong 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.lazy;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.hadoop.hive.serde2.lazy.objectinspector.primitive.LazyLongObjectInspector;
import org.apache.hadoop.io.LongWritable;
/**
* LazyObject for storing a value of Long.
*
*
* Part of the code is adapted from Apache Harmony Project.
*
* As with the specification, this implementation relied on code laid out in Henry S. Warren, Jr.'s Hacker's
* Delight, (Addison Wesley, 2002) as well as The Aggregate's Magic Algorithms.
*
*
*/
public class LazyLong extends
LazyPrimitive {
public LazyLong(LazyLongObjectInspector oi) {
super(oi);
data = new LongWritable();
}
public LazyLong(LazyLong copy) {
super(copy);
data = new LongWritable(copy.data.get());
}
@Override
public void init(ByteArrayRef bytes, int start, int length) {
try {
data.set(parseLong(bytes.getData(), start, length, 10));
isNull = false;
} catch (NumberFormatException e) {
isNull = true;
logExceptionMessage(bytes, start, length, "BIGINT");
}
}
/**
* Parses the string argument as if it was a long value and returns the
* result. Throws NumberFormatException if the string does not represent a
* long quantity.
*
* @param bytes
* @param start
* @param length
* a UTF-8 encoded string representation of a long quantity.
* @return long the value represented by the argument
* @exception NumberFormatException
* if the argument could not be parsed as a long quantity.
*/
public static long parseLong(byte[] bytes, int start, int length) {
return parseLong(bytes, start, length, 10);
}
/**
* Parses the string argument as if it was an long value and returns the
* result. Throws NumberFormatException if the string does not represent an
* long 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 long quantity.
* @param radix
* the base to use for conversion.
* @return the value represented by the argument
* @exception NumberFormatException
* if the argument could not be parsed as an long quantity.
*/
public static long parseLong(byte[] bytes, int start, int length, int radix) {
if (bytes == null) {
throw new NumberFormatException("String is null");
}
if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
throw new NumberFormatException("Invalid radix: " + radix);
}
if (length == 0) {
throw new NumberFormatException("Empty string!");
}
int offset = start;
boolean negative = bytes[start] == '-';
if (negative || bytes[start] == '+') {
offset++;
if (length == 1) {
throw new NumberFormatException(LazyUtils.convertToString(bytes, start,
length));
}
}
return parse(bytes, start, length, offset, radix, negative);
}
/**
* /** Parses the string argument as if it was an long value and returns the
* result. Throws NumberFormatException if the string does not represent an
* long 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 long quantity.
* @param offset
* the starting position after the sign (if exists)
* @param radix
* the base to use for conversion.
* @param negative
* whether the number is negative.
* @return the value represented by the argument
* @exception NumberFormatException
* if the argument could not be parsed as an long quantity.
*/
private static long parse(byte[] bytes, int start, int length, int offset,
int radix, boolean negative) {
byte separator = '.';
long max = Long.MIN_VALUE / radix;
long result = 0, end = start + length;
while (offset < end) {
int digit = LazyUtils.digit(bytes[offset++], radix);
if (digit == -1 || max > result) {
if (bytes[offset-1] == separator) {
// We allow decimals and will return a truncated integer in that case.
// Therefore we won't throw an exception here (checking the fractional
// part happens below.)
break;
}
throw new NumberFormatException(LazyUtils.convertToString(bytes, start,
length));
}
long next = result * radix - digit;
if (next > result) {
throw new NumberFormatException(LazyUtils.convertToString(bytes, start,
length));
}
result = next;
}
// This is the case when we've encountered a decimal separator. The fractional
// part will not change the number, but we will verify that the fractional part
// is well formed.
while (offset < end) {
int digit = LazyUtils.digit(bytes[offset++], radix);
if (digit == -1) {
throw new NumberFormatException(LazyUtils.convertToString(bytes, start,
length));
}
}
if (!negative) {
result = -result;
if (result < 0) {
throw new NumberFormatException(LazyUtils.convertToString(bytes, start,
length));
}
}
return result;
}
/**
* Writes out the text representation of an integer using base 10 to an
* OutputStream in UTF-8 encoding.
*
* Note: division by a constant (like 10) is much faster than division by a
* variable. That's one of the reasons that we don't make radix a parameter
* here.
*
* @param out
* the outputstream to write to
* @param i
* an int to write out
* @throws IOException
*/
public static void writeUTF8(OutputStream out, long i) throws IOException {
if (i == 0) {
out.write('0');
return;
}
boolean negative = i < 0;
if (negative) {
out.write('-');
} else {
// negative range is bigger than positive range, so there is no risk
// of overflow here.
i = -i;
}
long start = 1000000000000000000L;
while (i / start == 0) {
start /= 10;
}
while (start > 0) {
out.write('0' - (int) ((i / start) % 10));
start /= 10;
}
}
public static void writeUTF8NoException(OutputStream out, long i) {
try {
writeUTF8(out, i);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}