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/*
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.flink.streaming.api.transformations;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.operators.ResourceSpec;
import org.apache.flink.api.connector.sink.Sink;
import org.apache.flink.api.connector.sink.SinkWriter;
import org.apache.flink.api.dag.Transformation;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.core.memory.ManagedMemoryUseCase;
import org.apache.flink.streaming.api.operators.ChainingStrategy;

import org.apache.flink.shaded.guava30.com.google.common.collect.Lists;

import java.util.Collections;
import java.util.List;
import java.util.Optional;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * A {@link Transformation} for {@link Sink}.
 *
 * @param  The input type of the {@link SinkWriter}
 * @param  The committable type of the {@link SinkWriter}
 * @param  The state type of the {@link SinkWriter}
 * @param  The global committable type of the {@link
 *     org.apache.flink.api.connector.sink.GlobalCommitter}
 */
@Internal
public class SinkTransformation
        extends PhysicalTransformation {

    private final Transformation input;

    private final Sink sink;

    private ChainingStrategy chainingStrategy;

    public SinkTransformation(
            Transformation input,
            Sink sink,
            String name,
            int parallelism) {
        super(name, TypeExtractor.getForClass(Object.class), parallelism);
        this.input = checkNotNull(input);
        this.sink = checkNotNull(sink);
    }

    @Override
    public void setChainingStrategy(ChainingStrategy strategy) {
        chainingStrategy = checkNotNull(strategy);
    }

    @Override
    public List> getTransitivePredecessors() {
        final List> result = Lists.newArrayList();
        result.add(this);
        result.addAll(input.getTransitivePredecessors());
        return result;
    }

    @Override
    public List> getInputs() {
        return Collections.singletonList(input);
    }

    @Override
    public void setUidHash(String uidHash) {
        throw new UnsupportedOperationException(
                "Setting a UidHash is not supported for SinkTransformation.");
    }

    @Override
    public void setResources(ResourceSpec minResources, ResourceSpec preferredResources) {
        throw new UnsupportedOperationException(
                "Do not support set resources for SinkTransformation.");
    }

    @Override
    public Optional declareManagedMemoryUseCaseAtOperatorScope(
            ManagedMemoryUseCase managedMemoryUseCase, int weight) {
        throw new UnsupportedOperationException(
                "Declaring managed memory use cases is not supported for SinkTransformation.");
    }

    @Override
    public void declareManagedMemoryUseCaseAtSlotScope(ManagedMemoryUseCase managedMemoryUseCase) {
        throw new UnsupportedOperationException(
                "Declaring managed memory use cases is not supported for SinkTransformation.");
    }

    public ChainingStrategy getChainingStrategy() {
        return chainingStrategy;
    }

    public Sink getSink() {
        return sink;
    }
}
 















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