com.github.dm.jrt.operator.PeekOutputInvocation Maven / Gradle / Ivy

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/*
 * Copyright 2016 Davide Maestroni
 *
 * 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 com.github.dm.jrt.operator;

import com.github.dm.jrt.core.channel.Channel;
import com.github.dm.jrt.core.invocation.MappingInvocation;
import com.github.dm.jrt.core.util.ConstantConditions;
import com.github.dm.jrt.function.ConsumerDecorator;

import org.jetbrains.annotations.NotNull;

import static com.github.dm.jrt.core.util.Reflection.asArgs;

/**
 * Mapping invocation peeking output data as they are passed along.
 * 
 * Created by davide-maestroni on 04/21/2016.
 *
 * @param  the data type.
 */
class PeekOutputInvocation extends MappingInvocation {

  private final ConsumerDecorator mOutputConsumer;

  /**
   * Constructor.
   *
   * @param outputConsumer the consumer instance.
   */
  PeekOutputInvocation(@NotNull final ConsumerDecorator outputConsumer) {
    super(asArgs(ConstantConditions.notNull("consumer instance", outputConsumer)));
    mOutputConsumer = outputConsumer;
  }

  public void onInput(final DATA input, @NotNull final Channel result) throws Exception {
    mOutputConsumer.accept(input);
    result.pass(input);
  }
}