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Trino - Service Provider Interface (SPI)

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/*
 * 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.trino.spi.function;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import io.trino.spi.Experimental;

import java.util.List;
import java.util.Objects;

import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;

@Experimental(eta = "2022-10-31")
public class FunctionNullability
{
    private final boolean returnNullable;
    private final List argumentNullable;

    @JsonCreator
    public FunctionNullability(
            @JsonProperty("returnNullable") boolean returnNullable,
            @JsonProperty("argumentNullable") List argumentNullable)
    {
        this.returnNullable = returnNullable;
        this.argumentNullable = List.copyOf(requireNonNull(argumentNullable, "argumentNullable is null"));
    }

    @JsonProperty
    public boolean isReturnNullable()
    {
        return returnNullable;
    }

    public boolean isArgumentNullable(int index)
    {
        return argumentNullable.get(index);
    }

    @JsonProperty
    public List getArgumentNullable()
    {
        return argumentNullable;
    }

    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        FunctionNullability that = (FunctionNullability) o;
        return returnNullable == that.returnNullable &&
                argumentNullable.equals(that.argumentNullable);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(returnNullable, argumentNullable);
    }

    @Override
    public String toString()
    {
        return argumentNullable.stream().map(Objects::toString).collect(joining(", ", "(", ")")) + returnNullable;
    }
}