com.facebook.presto.operator.MaterializingOperator.java Source code

Introduction

Here is the source code for com.facebook.presto.operator.MaterializingOperator.java

Source

/*
 * 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.tuple.TupleInfo;
import com.facebook.presto.tuple.TupleInfo.Type;
import com.facebook.presto.util.MaterializedResult;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;

import java.util.List;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

public class MaterializingOperator implements Operator {
    public static class MaterializingOperatorFactory implements OperatorFactory {
        private final int operatorId;
        private final List<TupleInfo> sourceTupleInfos;
        private boolean closed;

        public MaterializingOperatorFactory(int operatorId, List<TupleInfo> sourceTupleInfos) {
            this.operatorId = operatorId;
            this.sourceTupleInfos = sourceTupleInfos;
        }

        @Override
        public List<TupleInfo> getTupleInfos() {
            return ImmutableList.of();
        }

        @Override
        public MaterializingOperator createOperator(DriverContext driverContext) {
            checkState(!closed, "Factory is already closed");
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId,
                    MaterializingOperator.class.getSimpleName());
            return new MaterializingOperator(operatorContext, sourceTupleInfos);
        }

        @Override
        public void close() {
            closed = true;
        }
    }

    private final OperatorContext operatorContext;
    private final MaterializedResult.Builder resultBuilder;
    private boolean finished;

    public MaterializingOperator(OperatorContext operatorContext, List<TupleInfo> sourceTupleInfos) {
        this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");

        ImmutableList.Builder<Type> types = ImmutableList.builder();
        for (TupleInfo sourceTupleInfo : checkNotNull(sourceTupleInfos, "sourceTupleInfos is null")) {
            types.addAll(sourceTupleInfo.getTypes());
        }
        resultBuilder = MaterializedResult.resultBuilder(new TupleInfo(types.build()));
    }

    public MaterializedResult getMaterializedResult() {
        return resultBuilder.build();
    }

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

    @Override
    public List<TupleInfo> getTupleInfos() {
        return ImmutableList.of();
    }

    @Override
    public void finish() {
        finished = true;
    }

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

    @Override
    public ListenableFuture<?> isBlocked() {
        return NOT_BLOCKED;
    }

    @Override
    public boolean needsInput() {
        return !finished;
    }

    @Override
    public void addInput(Page page) {
        checkNotNull(page, "page is null");
        checkState(!finished, "operator finished");

        resultBuilder.page(page);
        operatorContext.recordGeneratedOutput(page.getDataSize(), page.getPositionCount());
    }

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