| // 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 System; |
| using System.Collections.Generic; |
| using Apache.Arrow.Types; |
| |
| namespace Apache.Arrow |
| { |
| /// <summary> |
| /// A Column data structure that logically represents a column in a dataset |
| /// </summary> |
| public class Column |
| { |
| public Field Field { get; } |
| private readonly ChunkedArray _columnArrays; |
| public ChunkedArray Data => _columnArrays; |
| |
| public Column(Field field, IList<Array> arrays) |
| { |
| _columnArrays = new ChunkedArray(arrays); |
| Field = field; |
| if (!ValidateArrayDataTypes()) |
| { |
| throw new ArgumentException($"{Field.DataType} must match {_columnArrays.DataType}"); |
| } |
| } |
| |
| private Column(Field field, ChunkedArray arrays) |
| { |
| Field = field; |
| _columnArrays = arrays; |
| } |
| |
| public long Length => _columnArrays.Length; |
| public long NullCount => _columnArrays.NullCount; |
| public string Name => Field.Name; |
| public IArrowType Type => Field.DataType; |
| |
| public Column Slice(int offset, int length) |
| { |
| return new Column(Field, _columnArrays.Slice(offset, length)); |
| } |
| |
| public Column Slice(int offset) |
| { |
| return new Column(Field, _columnArrays.Slice(offset)); |
| } |
| |
| private bool ValidateArrayDataTypes() |
| { |
| for (int i = 0; i < _columnArrays.ArrayCount; i++) |
| { |
| if (_columnArrays.Array(i).Data.DataType != Field.DataType) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| } |