| // 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. |
| |
| using Apache.Arrow.Types; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Threading; |
| |
| namespace Apache.Arrow |
| { |
| public class StructArray : Array |
| { |
| private IReadOnlyList<IArrowArray> _fields; |
| |
| public IReadOnlyList<IArrowArray> Fields => |
| LazyInitializer.EnsureInitialized(ref _fields, () => InitializeFields()); |
| |
| public StructArray( |
| IArrowType dataType, int length, |
| IEnumerable<IArrowArray> children, |
| ArrowBuffer nullBitmapBuffer, int nullCount = 0, int offset = 0) |
| : this(new ArrayData( |
| dataType, length, nullCount, offset, new[] { nullBitmapBuffer }, |
| children.Select(child => child.Data))) |
| { |
| _fields = children.ToArray(); |
| } |
| |
| public StructArray(ArrayData data) |
| : base(data) |
| { |
| data.EnsureDataType(ArrowTypeId.Struct); |
| } |
| |
| public override void Accept(IArrowArrayVisitor visitor) => Accept(this, visitor); |
| |
| private IReadOnlyList<IArrowArray> InitializeFields() |
| { |
| IArrowArray[] result = new IArrowArray[Data.Children.Length]; |
| for (int i = 0; i < Data.Children.Length; i++) |
| { |
| result[i] = ArrowArrayFactory.BuildArray(Data.Children[i]); |
| } |
| return result; |
| } |
| } |
| } |