/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFToInteger.java
Java | 174 lines | 81 code | 13 blank | 80 comment | 21 complexity | f8b9ecfd0593e01f8fda2db707968804 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.ql.udf;
- import org.apache.hadoop.hive.ql.exec.UDF;
- import org.apache.hadoop.hive.serde2.io.ByteWritable;
- import org.apache.hadoop.hive.serde2.io.DoubleWritable;
- import org.apache.hadoop.hive.serde2.io.ShortWritable;
- import org.apache.hadoop.hive.serde2.lazy.LazyInteger;
- import org.apache.hadoop.io.BooleanWritable;
- import org.apache.hadoop.io.FloatWritable;
- import org.apache.hadoop.io.IntWritable;
- import org.apache.hadoop.io.LongWritable;
- import org.apache.hadoop.io.NullWritable;
- import org.apache.hadoop.io.Text;
- /**
- * UDFToInteger.
- *
- */
- public class UDFToInteger extends UDF {
- private IntWritable intWritable = new IntWritable();
- public UDFToInteger() {
- }
- /**
- * Convert from void to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The void value to convert
- * @return Integer
- */
- public IntWritable evaluate(NullWritable i) {
- return null;
- }
- /**
- * Convert from boolean to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The boolean value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(BooleanWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set(i.get() ? 1 : 0);
- return intWritable;
- }
- }
- /**
- * Convert from byte to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The byte value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(ByteWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set(i.get());
- return intWritable;
- }
- }
- /**
- * Convert from short to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The short value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(ShortWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set(i.get());
- return intWritable;
- }
- }
- /**
- * Convert from long to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The long value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(LongWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set((int) i.get());
- return intWritable;
- }
- }
- /**
- * Convert from float to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The float value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(FloatWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set((int) i.get());
- return intWritable;
- }
- }
- /**
- * Convert from double to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The double value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(DoubleWritable i) {
- if (i == null) {
- return null;
- } else {
- intWritable.set((int) i.get());
- return intWritable;
- }
- }
- /**
- * Convert from string to an integer. This is called for CAST(... AS INT)
- *
- * @param i
- * The string value to convert
- * @return IntWritable
- */
- public IntWritable evaluate(Text i) {
- if (i == null) {
- return null;
- } else {
- try {
- intWritable.set(LazyInteger
- .parseInt(i.getBytes(), 0, i.getLength(), 10));
- return intWritable;
- } catch (NumberFormatException e) {
- // MySQL returns 0 if the string is not a well-formed numeric value.
- // return IntWritable.valueOf(0);
- // But we decided to return NULL instead, which is more conservative.
- return null;
- }
- }
- }
- }