/*
 * 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 com.facebook.presto.operator;

import com.facebook.presto.common.Page;

import static java.util.Objects.requireNonNull;

public class FinishedOperator
        implements Operator
{
    private final OperatorContext operatorContext;

    public FinishedOperator(OperatorContext operatorContext)
    {
        this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
    }

    @Override
    public OperatorContext getOperatorContext()
    {
        return operatorContext;
    }

    @Override
    public void finish()
    {
    }

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

    @Override
    public boolean needsInput()
    {
        return false;
    }

    @Override
    public void addInput(Page page)
    {
        throw new UnsupportedOperationException();
    }

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