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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.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.connector.source.Boundedness;
import org.apache.flink.api.connector.source.Source;
import org.apache.flink.api.connector.source.SourceSplit;
import org.apache.flink.api.dag.Transformation;
import org.apache.flink.streaming.api.operators.ChainingStrategy;

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

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

/** A {@link PhysicalTransformation} for {@link Source}. */
@Internal
public class SourceTransformation
        extends PhysicalTransformation implements WithBoundedness {

    private final Source source;
    private final WatermarkStrategy watermarkStrategy;

    private ChainingStrategy chainingStrategy = ChainingStrategy.DEFAULT_CHAINING_STRATEGY;

    /**
     * Creates a new {@code Transformation} with the given name, output type and parallelism.
     *
     * @param name The name of the {@code Transformation}, this will be shown in Visualizations and
     *     the Log
     * @param source The {@link Source} itself
     * @param watermarkStrategy The {@link WatermarkStrategy} to use
     * @param outputType The output type of this {@code Transformation}
     * @param parallelism The parallelism of this {@code Transformation}
     */
    public SourceTransformation(
            String name,
            Source source,
            WatermarkStrategy watermarkStrategy,
            TypeInformation outputType,
            int parallelism) {
        super(name, outputType, parallelism);
        this.source = source;
        this.watermarkStrategy = watermarkStrategy;
    }

    public Source getSource() {
        return source;
    }

    public WatermarkStrategy getWatermarkStrategy() {
        return watermarkStrategy;
    }

    @Override
    public Boundedness getBoundedness() {
        return source.getBoundedness();
    }

    @Override
    public List> getTransitivePredecessors() {
        return Collections.singletonList(this);
    }

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

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

    public ChainingStrategy getChainingStrategy() {
        return chainingStrategy;
    }
}