streampipes-pipeline-elements-examples-processors-jvm/src/main/java/org/apache/streampipes/pe/examples/jvm/outputstrategy/TransformOutputController.java

/*
 * 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.streampipes.pe.examples.jvm.outputstrategy;

import org.apache.streampipes.model.graph.DataProcessorDescription;
import org.apache.streampipes.model.graph.DataProcessorInvocation;
import org.apache.streampipes.model.schema.PropertyScope;
import org.apache.streampipes.pe.examples.jvm.base.DummyEngine;
import org.apache.streampipes.pe.examples.jvm.base.DummyParameters;
import org.apache.streampipes.sdk.builder.ProcessingElementBuilder;
import org.apache.streampipes.sdk.builder.StreamRequirementsBuilder;
import org.apache.streampipes.sdk.extractor.ProcessingElementParameterExtractor;
import org.apache.streampipes.sdk.helpers.EpRequirements;
import org.apache.streampipes.sdk.helpers.Labels;
import org.apache.streampipes.sdk.helpers.OutputStrategies;
import org.apache.streampipes.sdk.helpers.SupportedFormats;
import org.apache.streampipes.sdk.helpers.SupportedProtocols;
import org.apache.streampipes.sdk.helpers.TransformOperations;
import org.apache.streampipes.sdk.utils.Datatypes;
import org.apache.streampipes.wrapper.standalone.ConfiguredEventProcessor;
import org.apache.streampipes.wrapper.standalone.declarer.StandaloneEventProcessingDeclarer;

import java.util.List;

public class TransformOutputController extends StandaloneEventProcessingDeclarer<DummyParameters> {

  @Override
  public DataProcessorDescription declareModel() {
    return ProcessingElementBuilder.create("org.apache.streampipes.examples.outputstrategy" +
            ".transform", "Transform output example example", "")
            .requiredStream(StreamRequirementsBuilder.
                    create()
                    .requiredPropertyWithUnaryMapping(EpRequirements.stringReq(), Labels.from
                            ("str", "The date property as a string", ""), PropertyScope.NONE)
                    .build())
            .supportedProtocols(SupportedProtocols.kafka())
            .supportedFormats(SupportedFormats.jsonFormat())

            .outputStrategy(OutputStrategies.transform(TransformOperations
                    .staticDatatypeTransformation("str", Datatypes.Long)))

            .build();
  }

  @Override
  public ConfiguredEventProcessor<DummyParameters> onInvocation(DataProcessorInvocation graph, ProcessingElementParameterExtractor extractor) {

    List<String> outputSelectors = extractor.outputKeySelectors();

    return new ConfiguredEventProcessor<>(new DummyParameters(graph), DummyEngine::new);
  }
}