/*

* 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 org.lance;

import org.apache.arrow.c.ArrowSchema;

import org.apache.arrow.c.Data;

import org.apache.arrow.memory.BufferAllocator;

import org.apache.arrow.vector.types.pojo.Schema;

import java.util.Arrays;

import java.util.List;

import java.util.Optional;

/** Utility. */

public class Utils {

/**

* Convert schema to ArrowSchema for JNI processing.

*

* @param schema schema

* @param allocator buffer allocator

* @return ArrowSchema

*/

public static ArrowSchema toFfi(Schema schema, BufferAllocator allocator) {

ArrowSchema arrowSchema = ArrowSchema.allocateNew(allocator);

Data.exportSchema(allocator, schema, null, arrowSchema);

return arrowSchema;

}

/**

* Convert optional array to optional list for JNI processing.

*

* @param optionalArray Optional array

* @return Optional list

*/

public static Optional<List<String>> convert(Optional<String[]> optionalArray) {

return optionalArray.map(Arrays::asList);

}

}