io.datakernel.datastream.processor.StreamTransformer Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 SoftIndex 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.datakernel.datastream.processor;

import io.datakernel.datastream.*;

import java.util.function.Function;

public interface StreamTransformer extends StreamInput, StreamOutput,
		StreamSupplierTransformer>,
		StreamConsumerTransformer> {

	static  StreamTransformer identity() {
		return StreamMapper.create(Function.identity());
	}

	@Override
	default StreamConsumer transform(StreamConsumer consumer) {
		getOutput().streamTo(consumer);
		return getInput();
	}

	@Override
	default StreamSupplier transform(StreamSupplier supplier) {
		supplier.streamTo(getInput());
		return getOutput();
	}

}