Examples with Transformer org.talend.dataprep.transformation.api.transformer.Transformer used on opensource projects

Example 1 with Transformer

use of org.talend.dataprep.transformation.api.transformer.Transformer in project data-prep by Talend.

the class XlsWriterTest method createSchemaParser.

/**
 * utility function
 */
public SchemaParser.Request createSchemaParser(String inputFileName) throws Exception {
    Path path = Files.createTempFile("datarep-foo", "xlsx");
    Files.deleteIfExists(path);
    try (final OutputStream outputStream = Files.newOutputStream(path)) {
        final Configuration configuration = // 
        Configuration.builder().format(// 
        XlsFormat.XLSX).output(// 
        outputStream).actions(// 
        "").build();
        final Transformer exporter = factory.get(configuration);
        final InputStream inputStream = XlsWriterTest.class.getResourceAsStream(inputFileName);
        try (JsonParser parser = mapper.getFactory().createParser(inputStream)) {
            final DataSet dataSet = mapper.readerFor(DataSet.class).readValue(parser);
            exporter.buildExecutable(dataSet, configuration).execute();
        }
    }
    DataSetMetadata metadata = metadataBuilder.metadata().id("123").build();
    return new SchemaParser.Request(Files.newInputStream(path), metadata);
}

Example 2 with Transformer

use of org.talend.dataprep.transformation.api.transformer.Transformer in project data-prep by Talend.

the class PipelineTransformer method buildExecutable.

@Override
public ExecutableTransformer buildExecutable(DataSet input, Configuration configuration) {
    final RowMetadata rowMetadata = input.getMetadata().getRowMetadata();
    // prepare the fallback row metadata
    RowMetadata fallBackRowMetadata = transformationRowMetadataUtils.getMatchingEmptyRowMetadata(rowMetadata);
    final TransformerWriter writer = writerRegistrationService.getWriter(configuration.formatId(), configuration.output(), configuration.getArguments());
    final ConfiguredCacheWriter metadataWriter = new ConfiguredCacheWriter(contentCache, DEFAULT);
    final TransformationMetadataCacheKey metadataKey = cacheKeyGenerator.generateMetadataKey(configuration.getPreparationId(), configuration.stepId(), configuration.getSourceType());
    final PreparationMessage preparation = configuration.getPreparation();
    // function that from a step gives the rowMetadata associated to the previous/parent step
    final Function<Step, RowMetadata> previousStepRowMetadataSupplier = s -> // 
    Optional.ofNullable(s.getParent()).map(// 
    id -> preparationUpdater.get(id)).orElse(null);
    final Pipeline pipeline = // 
    Pipeline.Builder.builder().withAnalyzerService(// 
    analyzerService).withActionRegistry(// 
    actionRegistry).withPreparation(// 
    preparation).withActions(// 
    actionParser.parse(configuration.getActions())).withInitialMetadata(rowMetadata, // 
    configuration.volume() == SMALL).withMonitor(// 
    configuration.getMonitor()).withFilter(// 
    configuration.getFilter()).withLimit(// 
    configuration.getLimit()).withFilterOut(// 
    configuration.getOutFilter()).withOutput(// 
    () -> new WriterNode(writer, metadataWriter, metadataKey, fallBackRowMetadata)).withStatisticsAdapter(// 
    adapter).withStepMetadataSupplier(// 
    previousStepRowMetadataSupplier).withGlobalStatistics(// 
    configuration.isGlobalStatistics()).allowMetadataChange(// 
    configuration.isAllowMetadataChange()).build();
    // wrap this transformer into an executable transformer
    return new ExecutableTransformer() {

        @Override
        public void execute() {
            try {
                LOGGER.debug("Before transformation: {}", pipeline);
                pipeline.execute(input);
            } finally {
                LOGGER.debug("After transformation: {}", pipeline);
            }
            if (preparation != null) {
                final UpdatedStepVisitor visitor = new UpdatedStepVisitor(preparationUpdater);
                pipeline.accept(visitor);
            }
        }

        @Override
        public void signal(Signal signal) {
            pipeline.signal(signal);
        }
    };
}