| /* |
| * Copyright 2016, Yahoo! Inc. |
| * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms. |
| */ |
| |
| package com.yahoo.sketches.pig.frequencies; |
| |
| import org.apache.pig.Algebraic; |
| |
| import com.yahoo.sketches.ArrayOfStringsSerDe; |
| |
| /** |
| * This UDF creates a FrequentItemsSketch<String> from raw data. |
| * It supports all three ways: exec(), Accumulator and Algebraic. |
| */ |
| public class DataToFrequentStringsSketch extends DataToFrequentItemsSketch<String> implements Algebraic { |
| |
| /** |
| * Constructor |
| * @param sketchSize String representation of sketch size |
| */ |
| public DataToFrequentStringsSketch(final String sketchSize) { |
| super(Integer.parseInt(sketchSize), new ArrayOfStringsSerDe()); |
| } |
| |
| @Override |
| public String getInitial() { |
| return Initial.class.getName(); |
| } |
| |
| @Override |
| public String getIntermed() { |
| return IntermediateFinal.class.getName(); |
| } |
| |
| @Override |
| public String getFinal() { |
| return IntermediateFinal.class.getName(); |
| } |
| |
| public static class Initial extends AlgebraicInitial { |
| /** |
| * Constructor for the initial pass of an Algebraic function. This will be passed the same |
| * constructor arguments as the original UDF. |
| * @param sketchSize String representation of sketch size |
| */ |
| public Initial(final String sketchSize) {} |
| |
| /** |
| * Default constructor to make pig validation happy |
| */ |
| public Initial() {} |
| } |
| |
| public static class IntermediateFinal extends DataToFrequentItemsSketchAlgebraicIntermediateFinal<String> { |
| /** |
| * Constructor for the intermediate and final passes of an Algebraic function. This will be |
| * passed the same constructor arguments as the original UDF. |
| * @param sketchSize String representation of sketch size |
| */ |
| public IntermediateFinal(final String sketchSize) { |
| super(Integer.parseInt(sketchSize), new ArrayOfStringsSerDe()); |
| } |
| |
| /** |
| * Default constructor to make pig validation happy. |
| */ |
| public IntermediateFinal() {} |
| } |
| |
| } |