/*
* 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;
import io.crate.data.Input;
import io.crate.metadata.Reference;
import io.crate.operation.reference.ReferenceResolver;
import java.util.function.Consumer;
public class GatheringRefResolver<E extends Input<?>> implements ReferenceResolver<E> {
private final Consumer<E> consumer;
private final ReferenceResolver<E> delegate;
public GatheringRefResolver(Consumer<E> consumer, ReferenceResolver<E> delegate) {
this.consumer = consumer;
this.delegate = delegate;
}
@Override
public E getImplementation(Reference ref) {
E implementation = delegate.getImplementation(ref);
if (implementation == null) {
return null;
}
consumer.accept(implementation);
return implementation;
}
}