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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.connector;

import io.airlift.slice.Slice;
import io.trino.spi.Page;
import io.trino.spi.block.Block;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;

import static java.util.concurrent.CompletableFuture.completedFuture;

public class EmptyPageSource
        implements UpdatablePageSource
{
    @Override
    public void deleteRows(Block rowIds)
    {
        throw new UnsupportedOperationException("deleteRows called on EmptyPageSource");
    }

    @Override
    public void updateRows(Page page, List columnValueAndRowIdChannels)
    {
        throw new UnsupportedOperationException("updateRows called on EmptyPageSource");
    }

    @Override
    public CompletableFuture> finish()
    {
        return completedFuture(Collections.emptyList());
    }

    @Override
    public long getCompletedBytes()
    {
        return 0;
    }

    @Override
    public long getReadTimeNanos()
    {
        return 0;
    }

    @Override
    public boolean isFinished()
    {
        return true;
    }

    @Override
    public Page getNextPage()
    {
        return null;
    }

    @Override
    public long getMemoryUsage()
    {
        return 0;
    }

    @Override
    public void close() {}
}