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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.mrunit;
 
 
 import java.util.List;
 
Harness that allows you to test a Reducer instance. You provide a key and a set of intermediate values for that key that represent inputs that should be sent to the Reducer (as if they came from a Mapper), and outputs you expect to be sent by the Reducer to the collector. By calling runTest(), the harness will deliver the input to the Reducer and will check its outputs against the expected results. This is designed to handle a single (k, v*) -> (k, v)* case from the Reducer, representing a single unit test. Multiple input (k, v*) sets should go in separate unit tests.
 
 public abstract class ReduceDriverBase<K1, V1, K2, V2> extends TestDriver<K1, V1, K2, V2> {
 
   protected K1 inputKey;
   protected List<V1> inputValues;
 
   public ReduceDriverBase() {
      = new ArrayList<V1>();
   }

  
Sets the input key to send to the Reducer
 
   public void setInputKey(K1 key) {
      = key;
   }

  
adds an input value to send to the reducer

Parameters:
val
 
   public void addInputValue(V1 val) {
     .add(val);
   }

  
Sets the input values to send to the reducer; overwrites existing ones

Parameters:
values
 
   public void setInputValues(List<V1> values) {
     .clear();
     .addAll(values);
   }

  
Adds a set of input values to send to the reducer

Parameters:
values
 
   public void addInputValues(List<V1> values) {
     .addAll(values);
   }

  
Sets the input to send to the reducer

Parameters:
values
 
   public void setInput(K1 keyList<V1> values) {
     setInputKey(key);
     setInputValues(values);
   }

  
Adds an output (k, v) pair we expect from the Reducer

Parameters:
outputRecord The (k, v) pair to add
  public void addOutput(Pair<K2, V2> outputRecord) {
    if (null != outputRecord) {
      .add(outputRecord);
    } else {
      throw new IllegalArgumentException("Tried to add null outputRecord");
    }
  }

  
Adds an output (k, v) pair we expect from the Reducer

Parameters:
key The key part of a (k, v) pair to add
val The val part of a (k, v) pair to add
  public void addOutput(K2 key, V2 val) {
    addOutput(new Pair<K2, V2>(keyval));
  }

  
Expects an input of the form "key \t val, val, val..." Forces the Reducer input types to Text.

Parameters:
input A string of the form "key \t val,val,val". Trims any whitespace.
  public void setInputFromString(String input) {
    if (null == input) {
      throw new IllegalArgumentException("null input given to setInputFromString");
    } else {
      Pair<TextTextinputPair = parseTabbedPair(input);
      if (null != inputPair) {
        // I know this is not type-safe, but I don't know a better way to do
        // this.
        setInputKey((K1) inputPair.getFirst());
        setInputValues((List<V1>) parseCommaDelimitedList(inputPair.getSecond()
                .toString()));
      } else {
        throw new IllegalArgumentException(
            "Could not parse input pair in setInputFromString");
      }
    }
  }

  
Expects an input of the form "key \t val" Forces the Reducer output types to Text.

Parameters:
output A string of the form "key \t val". Trims any whitespace.
  public void addOutputFromString(String output) {
    if (null == output) {
      throw new IllegalArgumentException("null input given to setOutput");
    } else {
      Pair<TextTextoutputPair = parseTabbedPair(output);
      if (null != outputPair) {
        // I know this is not type-safe, but I don't know a better way to do
        // this.
        addOutput((Pair<K2, V2>) outputPair);
      } else {
        throw new IllegalArgumentException("Could not parse output pair in setOutput");
      }
    }
  }
  public abstract List<Pair<K2, V2>> run() throws IOException;
  public void runTest() throws RuntimeException {
    String inputKeyStr = "(null)";
    if (null != ) {
      inputKeyStr = .toString();
    }
    StringBuilder sb = new StringBuilder();
    .debug("Reducing input (" + inputKeyStr + ", " + sb.toString() + ")");
    List<Pair<K2, V2>> outputs = null;
    try {
      outputs = run();
      validate(outputs);
    } catch (IOException ioe) {
      .error("IOException in reducer: " + ioe.toString());
      .debug("Setting success to false based on IOException");
      throw new RuntimeException();
    }
  }
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