crunch-scrunch/src/it/scala/org/apache/crunch/scrunch/IncrementTest.scala

/**
 * 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,
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 * See the License for the specific language governing permissions and
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 */
package org.apache.crunch.scrunch

import org.apache.crunch.io.{From => from, To => to}

import _root_.org.junit.Test
import _root_.org.junit.Assert.assertEquals

class IncrementTest extends CrunchSuite {

  @Test def testIncrement {
    val pipeline = Pipeline.mapReduce[IncrementTest](tempDir.getDefaultConfiguration)
    val input = tempDir.copyResourceFileName("shakes.txt")

    pipeline.read(from.textFile(input, Avros.strings))
        .flatMap(_.toLowerCase.split("\\s+"))
        .increment("TOP", "ALLWORDS")
        .filter(!_.isEmpty())
        .increment("TOP", "NONEMPTY")
        .incrementIf(_ startsWith "a")("TOP", "AWORDS_2x", 2)
        .write(to.avroFile(tempDir.getFileName("somewords")))

    val res = pipeline.done()
    val sr0 = res.getStageResults.get(0)
    assertEquals(21836, sr0.getCounterValue("TOP", "ALLWORDS"))
    assertEquals(20366, sr0.getCounterValue("TOP", "NONEMPTY"))
    assertEquals(3604, sr0.getCounterValue("TOP", "AWORDS_2x"))
  }
}