Examples of cascading.operation.Function

cascading.operation.Function
Interface Function marks a given {@link Operation} as a function, as opposed to being a {@link Filter}.
A Function is responsible for taking Tuple arguments and returning one or more result Tuples.
To implement a Function, (optionally) sub-class {@link BaseOperation} and have the new sub-class {@code implement}this interface.

    Map sources = new HashMap();


    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    Tap sink = new Hfs( new SequenceFile( Fields.ALL ), getOutputPath( "customerwritable" ), SinkMode.REPLACE );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    pipeLower = new Each( pipeLower, new InsertTestText( new Fields( "group" ), "inserted text as bytes", false ), Fields.ALL );

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    Map sources = new HashMap();


    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    // using null pos so all fields are written
    Fields fields = new Fields( "num", "char", "group", "value", "num2", "char2", "group2", "value2" );
    Tap sink = new Hfs( new SequenceFile( fields ), getOutputPath( "/rawbyteskeyvalue/" + useDefaultComparator + "/" + secondarySortOnValue + "/" + ignoreSerializationToken + "/" + compositeGrouping ), SinkMode.REPLACE );

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    Map sinks = new HashMap();
    sinks.put( "sink", new NonTap( "sink", new Fields( "offset", "line" ) ) );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );


    Pipe pipeLhs = new Each( new Pipe( "lhs" ), new Fields( "line" ), splitter );

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    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Tap sink = getPlatform().getTextFile( new Fields( "line" ), getOutputPath( "cogroup" ), SinkMode.REPLACE );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );


    Pipe splice = new CoGroup( pipeLower, new Fields( "num" ), pipeUpper, new Fields( "num" ), new BufferJoin() );

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    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Tap sink = getPlatform().getTextFile( new Fields( "line" ), "failpath", SinkMode.REPLACE );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );


    Pipe splice = new CoGroup( pipeLower, new Fields( "num" ), pipeUpper, new Fields( "num" ), new BufferJoin() );

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 */
public class JoinAroundJoinRightMostGraph extends FlowElementGraph
  {
  public JoinAroundJoinRightMostGraph()
    {
    Function function = new Insert( new Fields( "num", "char" ), "a", "b" );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), function );
    Pipe pipeUpper1 = new Each( new Pipe( "upper1" ), new Fields( "line" ), function );
    Pipe pipeUpper2 = new Each( new Pipe( "upper2" ), new Fields( "line" ), function );

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    sources.put( "lower", sourceLower );
    sources.put( "upper1", sourceUpper );
    sources.put( "upper2", sourceUpper );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    // using null pos so all fields are written
    Tap sink = new Hfs( new TextLine(), "output", true );


    Pipe pipeLower = new Each( "lower", new Fields( "line" ), splitter );

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    Map sources = new HashMap();


    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    // using null pos so all fields are written
    Tap sink = new Hfs( new TextLine(), "/complex/cogroup/", true );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );

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    Map sinks = new HashMap();
    sinks.put( "sink", new NonTap( "sink", new Fields( "offset", "line" ) ) );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper1 = new Each( new Pipe( "upper1" ), new Fields( "line" ), splitter );
    Pipe pipeUpper2 = new Each( new Pipe( "upper2" ), new Fields( "line" ), splitter );

View Full Code Here

    Map sources = new HashMap();


    sources.put( "lower", sourceLower );
    sources.put( "upper", sourceUpper );


    Function splitter = new RegexSplitter( new Fields( "num", "char" ), " " );


    // using null pos so all fields are written
    Tap sink = new Hfs( new TextLine(), "/complex/cogroup/", true );


    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );

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cascading.BasicPipesPlatformTest

cascading.BufferPipesPlatformTest

cascading.CoGroupFieldedPipesPlatformTest

cascading.DistanceUseCasePlatformTest

cascading.FieldedPipesPlatformTest

cascading.flow.hadoop.BuildJobsHadoopPlatformTest

cascading.flow.hadoop.FlowPlatformTest

cascading.flow.iso.graph.HashJoinAroundHashJoinLeftMostGraph

cascading.flow.iso.graph.HashJoinSameSourceGraph

cascading.flow.iso.graph.HashJoinsIntoMerge

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