| /* |
| * 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.pig.builtin; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.PigWarning; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| |
| |
| /** |
| * INDEXOF implements eval function to search for a string |
| * Example: |
| * A = load 'mydata' as (name); |
| * B = foreach A generate INDEXOF(name, ","); |
| */ |
| public class INDEXOF extends EvalFunc<Integer> { |
| |
| private static final Log log = LogFactory.getLog(INDEXOF.class); |
| |
| /** |
| * Method invoked on every tuple during foreach evaluation |
| * @param input tuple; first column is assumed to have the column to convert |
| * the second column is the string we search for |
| * the third is an optional column from where to start the search |
| * @exception java.io.IOException |
| * @return index of first occurrence, or null in case of processing error |
| */ |
| @Override |
| public Integer exec(Tuple input) throws IOException { |
| if (input == null || input.size() < 2) { |
| warn("invalid input tuple: "+input, PigWarning.UDF_WARNING_1); |
| return null; |
| } |
| try { |
| String str = (String)input.get(0); |
| String search = (String)input.get(1); |
| int fromIndex = 0; |
| if (input.size() >=3) |
| fromIndex = (Integer)input.get(2); |
| return str.indexOf(search, fromIndex); |
| } catch(Exception e){ |
| warn("Failed to process input; error - " + e.getMessage(), PigWarning.UDF_WARNING_1); |
| return null; |
| } |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| return new Schema(new Schema.FieldSchema(null, DataType.INTEGER)); |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| } |