/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.operation.projectors;

import io.crate.data.BatchIterator;
import io.crate.data.Input;
import io.crate.data.Projector;
import io.crate.data.Row;
import io.crate.operation.aggregation.RowTransformingBatchIterator;
import io.crate.operation.collect.CollectExpression;

import java.util.List;

/**
 * Projector which evaluates scalars or extends/cuts columns, see {@link RowTransformingBatchIterator}.
 */
public class InputRowProjector implements Projector {

    protected final List<Input<?>> inputs;
    protected final Iterable<? extends CollectExpression<Row, ?>> collectExpressions;

    public InputRowProjector(List<Input<?>> inputs,
                             Iterable<? extends CollectExpression<Row, ?>> collectExpressions) {
        this.inputs = inputs;
        this.collectExpressions = collectExpressions;
    }

    @Override
    public BatchIterator apply(BatchIterator batchIterator) {
        return new RowTransformingBatchIterator(batchIterator, inputs, collectExpressions);
    }

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