/*
* 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.data;
import java.util.function.UnaryOperator;
/**
* Projects a given upstream {@link BatchIterator} object and returns a batch iterator which follows the semantics of
* the underlying projection.
*/
public interface Projector extends UnaryOperator<BatchIterator> {
/**
* Indicates that the projector supports scrolling independent of the source iterator.
* <p>
* If the projector does not support independent scrolling, the source iterator must provide the scrolling
* capability on its own
*/
default boolean providesIndependentScroll() {
return false;
}
}