/*
* 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.piggybank.evaluation.string;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.DataType;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.FuncSpec;
/**
* string.INSTR implements eval function to search for a string
* Example:
* register pigudfs.jar;
* A = load 'mydata' as (name);
* B = foreach A generate string.INDEXOF(name, ",");
* dump B;
*/
public class INDEXOF extends EvalFunc<Integer>
{
/**
* 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
*/
public Integer exec(Tuple input) throws IOException {
if (input == null || input.size() == 0)
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(1);
return str.indexOf(search, fromIndex);
}catch(Exception e){
System.err.println("Failed to process input; error - " + e.getMessage());
return null;
}
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(null, DataType.INTEGER));
}
}