content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * Licensed 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 io.activej.dataflow.node.impl;
  
  import io.activej.common.annotation.ExposedInternals;
  import io.activej.dataflow.graph.StreamId;
  import io.activej.dataflow.graph.Task;
  import io.activej.dataflow.node.AbstractNode;
  import io.activej.datastream.processor.transformer.StreamTransformer;
  import io.activej.datastream.processor.transformer.StreamTransformers;
  import io.activej.datastream.processor.transformer.impl.Limiter;
  import io.activej.datastream.processor.transformer.impl.Skip;
  import io.activej.datastream.supplier.StreamSupplier;
  
  import java.util.Collection;
  import java.util.List;
  
  @ExposedInternals
  public final class OffsetLimit extends AbstractNode {
  	public final StreamId input;
  	public final StreamId output;
  
  	public final long offset;
  	public final long limit;
  
  	public OffsetLimit(int index, long offset, long limit, StreamId input, StreamId output) {
  		super(index);
  		this.input = input;
  		this.output = output;
  		this.offset = offset;
  		this.limit = limit;
  	}
  
  	@Override
  	public Collection<StreamId> getOutputs() {
  		return List.of(output);
  	}
  
  	@Override
  	public void createAndBind(Task task) {
  		StreamTransformer<?, ?> skip = StreamTransformers.skip(offset);
  		task.bindChannel(input, skip.getInput());
  
  		StreamSupplier<?> supplier = skip.getOutput()
  			.transformWith(StreamTransformers.limit(limit));
  		task.export(output, supplier);
  	}
  
  	@Override
  	public List<StreamId> getInputs() {
  		return List.of(input);
  	}
  
  	@Override
  	public String toString() {
  		return
  			"OffsetLimit{" +
  			"input=" + input +
  			", output=" + output +
  			", offset=" + (offset == Skip.NO_SKIP ? "NONE" : offset) +
  			", limit=" + (limit == Limiter.NO_LIMIT ? "NONE" : limit) +
  			'}';
  	}
  }
  