| /* |
| * 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.chukwa; |
| |
| import java.io.IOException; |
| |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| |
| /** |
| * string.PARSEDOUBLE implements a binding to the Java method |
| * {@link java.lang.Double#parseDouble(String)} |
| * |
| * <dl> |
| * <dt><b>Parameters:</b></dt> |
| * <dd><code>strtoconvert</code> - <code>chararray</code> |
| * |
| * <dt><b>Return Value:</b></dt> |
| * <dd><code>double</code> parsed value</dd> |
| * |
| * <dt><b>Return Schema:</b></dt> |
| * <dd>parselong: double</dd> |
| * |
| * <dt><b>Example:</b></dt> |
| * <dd><code> |
| * register string.jar;<br/> |
| * A = load 'mydata' using PigStorage() as ( stringnumber: chararray );<br/> |
| * B = foreach A generate stringnumber, org.apache.hadoop.chukwa.PARSEDOUBLE(stringnumber)); |
| * </code></dd> |
| * </dl> |
| * |
| */ |
| public class PARSEDOUBLE extends EvalFunc<Double> { |
| |
| public Double exec(Tuple input) throws IOException { |
| if (input == null || input.size() < 1) |
| return null; |
| try { |
| String strtoconvert = input.get(0).toString(); |
| Double number = Double.parseDouble(strtoconvert); |
| |
| return number; |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| Schema schema = null; |
| try { |
| schema = new Schema(new Schema.FieldSchema(input.getField(0).alias, DataType.DOUBLE)); |
| } catch (FrontendException e) { |
| schema = new Schema(new Schema.FieldSchema(getSchemaName("parseDouble", input), |
| DataType.DOUBLE)); |
| } |
| return schema; |
| } |
| } |