Examples of org.apache.pig.impl.streaming.StreamingCommand

org.apache.pig.impl.streaming.StreamingCommand
{@link StreamingCommand} represents the specification of an externalcommand to be executed in a Pig Query. StreamingCommand encapsulates all relevant details of the command specified by the user either directly via the STREAM operator or indirectly via a DEFINE operator. It includes details such as input/output/error specifications and also files to be shipped to the cluster and files to be cached.

            }
        } else {
            if(op instanceof LOLoad) {
                return ((LOLoad)op).getInputFile().getFuncSpec();
            } else if (op instanceof LOStream) {
                StreamingCommand command = ((LOStream)op).getStreamingCommand();
                HandleSpec streamOutputSpec = command.getOutputSpec(); 
                FuncSpec streamLoaderSpec = new FuncSpec(streamOutputSpec.getSpec());
                return streamLoaderSpec;
            } else if ((op instanceof LOFilter)
                    || (op instanceof LODistinct)
                    || (op instanceof LOSort)

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                            cast.setFieldSchema(fs.clone());
                            FuncSpec loadFuncSpec = null;
                            if(lo instanceof LOLoad) {
                                loadFuncSpec = ((LOLoad)lo).getInputFile().getFuncSpec();
                            } else if (lo instanceof LOStream) {
                                StreamingCommand command = ((LOStream)lo).getStreamingCommand();
                                HandleSpec streamOutputSpec = command.getOutputSpec(); 
                                loadFuncSpec = new FuncSpec(streamOutputSpec.getSpec());
                            } else {
                                int errCode = 2006;
                                String msg = "TypeCastInserter invoked with an invalid operator class name: " + lo.getClass().getSimpleName();
                                throw new OptimizerException(msg, errCode, PigException.BUG);

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        // optimize only B's input spec since it is immediately following a store
        // and is conducive to optimization. At this point we clone and make
        // sure only B's "command" gets optimized while C's "command" remains
        // untouched.


        StreamingCommand optimizedCommand = (StreamingCommand)command.clone();
        
        if (handle == Handle.INPUT) {
            HandleSpec streamInputSpec = optimizedCommand.getInputSpec();
            streamInputSpec.setSpec(spec);
        } else if (handle == Handle.OUTPUT) {
            HandleSpec streamOutputSpec = optimizedCommand.getOutputSpec();
            streamOutputSpec.setSpec(spec);
        }
        
        command = optimizedCommand;
    }

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                    exp.add(cast);
                    FuncSpec loadFuncSpec = null;
                    if(op instanceof LOLoad) {
                        loadFuncSpec = ((LOLoad)op).getFileSpec().getFuncSpec();
                    } else if (op instanceof LOStream) {
                        StreamingCommand command = ((LOStream)op).getStreamingCommand();
                        HandleSpec streamOutputSpec = command.getOutputSpec(); 
                        loadFuncSpec = new FuncSpec(streamOutputSpec.getSpec());
                    } else {
                        String msg = "TypeCastInserter invoked with an invalid operator class name: " + innerPlan.getClass().getSimpleName();
                        throw new FrontendException(msg, 2242);
                    }

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    }


    StreamingCommand buildCommand(SourceLocation loc, String cmd, List<String> shipPaths, List<String> cachePaths,
            List<HandleSpec> inputHandleSpecs, List<HandleSpec> outputHandleSpecs,
            String logDir, Integer limit) throws RecognitionException {
        StreamingCommand command = null;
        try {
            command = buildCommand( loc, cmd );


            // Process ship paths
            if( shipPaths != null ) {
                if( shipPaths.size() == 0 ) {
                    command.setShipFiles( false );
                } else {
                    for( String path : shipPaths )
                        command.addPathToShip( path );
                }
            }


            // Process cache paths
            if( cachePaths != null ) {
                for( String path : cachePaths )
                    command.addPathToCache( path );
            }


            // Process input handle specs
            if( inputHandleSpecs != null ) {
                for( HandleSpec spec : inputHandleSpecs )
                    command.addHandleSpec( Handle.INPUT, spec );
            }


            // Process output handle specs
            if( outputHandleSpecs != null ) {
                for( HandleSpec spec : outputHandleSpecs )
                    command.addHandleSpec( Handle.OUTPUT, spec );
            }


            // error handling
            if( logDir != null )
                command.setLogDir( logDir );
            if( limit != null )
                command.setLogFilesLimit( limit );
        } catch(IOException e) {
            throw new PlanGenerationFailureException( intStream, loc, e );
        }


        return command;

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    }


    StreamingCommand buildCommand(SourceLocation loc, String cmd) throws RecognitionException {
        try {
            String[] args = StreamingCommandUtils.splitArgs( cmd );
            StreamingCommand command = new StreamingCommand( pigContext, args );
            StreamingCommandUtils validator = new StreamingCommandUtils( pigContext );
            validator.checkAutoShipSpecs( command, args );
            return command;
        } catch (ParserException e) {
            throw new InvalidCommandException( intStream, loc, cmd );

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    }


    @Override
    public void visit(LOStream stream) throws FrontendException{
        mapToPredLoadFunc(stream);
        StreamingCommand command = ((LOStream)stream).getStreamingCommand();
        HandleSpec streamOutputSpec = command.getOutputSpec(); 
        FuncSpec streamLoaderSpec = new FuncSpec(streamOutputSpec.getSpec());
        setLoadFuncForUids(stream.getSchema(), streamLoaderSpec);
        rel2InputFuncMap.put(stream, streamLoaderSpec);
    }

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                    exp.add(cast);
                    FuncSpec loadFuncSpec = null;
                    if(op instanceof LOLoad) {
                        loadFuncSpec = ((LOLoad)op).getFileSpec().getFuncSpec();
                    } else if (op instanceof LOStream) {
                        StreamingCommand command = ((LOStream)op).getStreamingCommand();
                        HandleSpec streamOutputSpec = command.getOutputSpec(); 
                        loadFuncSpec = new FuncSpec(streamOutputSpec.getSpec());
                    } else {
                        String msg = "TypeCastInserter invoked with an invalid operator class name: " + innerPlan.getClass().getSimpleName();
                        throw new FrontendException(msg, 2242);
                    }

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                            cast.setFieldSchema(fs.clone());
                            FuncSpec loadFuncSpec = null;
                            if(lo instanceof LOLoad) {
                                loadFuncSpec = ((LOLoad)lo).getInputFile().getFuncSpec();
                            } else if (lo instanceof LOStream) {
                                StreamingCommand command = ((LOStream)lo).getStreamingCommand();
                                HandleSpec streamOutputSpec = command.getOutputSpec(); 
                                loadFuncSpec = new FuncSpec(streamOutputSpec.getSpec());
                            } else {
                                int errCode = 2006;
                                String msg = "TypeCastInserter invoked with an invalid operator class name: " + lo.getClass().getSimpleName();
                                throw new OptimizerException(msg, errCode, PigException.BUG);

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        // optimize only B's input spec since it is immediately following a store
        // and is conducive to optimization. At this point we clone and make
        // sure only B's "command" gets optimized while C's "command" remains
        // untouched.


        StreamingCommand optimizedCommand = (StreamingCommand)command.clone();
        
        if (handle == Handle.INPUT) {
            HandleSpec streamInputSpec = optimizedCommand.getInputSpec();
            streamInputSpec.setSpec(spec);
        } else if (handle == Handle.OUTPUT) {
            HandleSpec streamOutputSpec = optimizedCommand.getOutputSpec();
            streamOutputSpec.setSpec(spec);
        }
        
        command = optimizedCommand;
    }

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