/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*/
package org.apache.drill.exec.vector.complex;
import org.apache.drill.exec.vector.AddOrGetResult;
import org.apache.drill.exec.vector.ValueVector;
import org.apache.drill.exec.vector.VectorDescriptor;
/**
* A mix-in used for introducing container vector-like behaviour.
*/
public interface ContainerVectorLike {
/**
* Creates and adds a child vector if none with the same name exists, else returns the vector instance.
*
* @param descriptor vector descriptor
* @return result of operation wrapping vector corresponding to the given descriptor and whether it's newly created
* @throws org.apache.drill.common.exceptions.DrillRuntimeException
* if schema change is not permissible between the given and existing data vector types.
*/
<T extends ValueVector> AddOrGetResult<T> addOrGetVector(VectorDescriptor descriptor);
/**
* Returns the number of child vectors in this container vector-like instance.
*/
int size();
}