ArrowArrayFactory.cs

// 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.Arrays;
using Apache.Arrow.Types;
using System;

namespace Apache.Arrow
{
    public static class ArrowArrayFactory
    {
        public static IArrowArray BuildArray(ArrayData data)
        {
            switch (data.DataType.TypeId)
            {
                case ArrowTypeId.Null:
                    return new NullArray(data);
                case ArrowTypeId.Boolean:
                    return new BooleanArray(data);
                case ArrowTypeId.UInt8:
                    return new UInt8Array(data);
                case ArrowTypeId.Int8:
                    return new Int8Array(data);
                case ArrowTypeId.UInt16:
                    return new UInt16Array(data);
                case ArrowTypeId.Int16:
                    return new Int16Array(data);
                case ArrowTypeId.UInt32:
                    return new UInt32Array(data);
                case ArrowTypeId.Int32:
                    return new Int32Array(data);
                case ArrowTypeId.UInt64:
                    return new UInt64Array(data);
                case ArrowTypeId.Int64:
                    return new Int64Array(data);
                case ArrowTypeId.Float:
                    return new FloatArray(data);
                case ArrowTypeId.Double:
                    return new DoubleArray(data);
                case ArrowTypeId.String:
                    return new StringArray(data);
                case ArrowTypeId.StringView:
                    return new StringViewArray(data);
                case ArrowTypeId.LargeString:
                    return new LargeStringArray(data);
                case ArrowTypeId.FixedSizedBinary:
                    return new FixedSizeBinaryArray(data);
                case ArrowTypeId.Binary:
                    return new BinaryArray(data);
                case ArrowTypeId.BinaryView:
                    return new BinaryViewArray(data);
                case ArrowTypeId.LargeBinary:
                    return new LargeBinaryArray(data);
                case ArrowTypeId.Timestamp:
                    return new TimestampArray(data);
                case ArrowTypeId.List:
                    return new ListArray(data);
                case ArrowTypeId.ListView:
                    return new ListViewArray(data);
                case ArrowTypeId.LargeList:
                    return new LargeListArray(data);
                case ArrowTypeId.Map:
                    return new MapArray(data);
                case ArrowTypeId.Struct:
                    return new StructArray(data);
                case ArrowTypeId.Union:
                    return UnionArray.Create(data);
                case ArrowTypeId.Date64:
                    return new Date64Array(data);
                case ArrowTypeId.Date32:
                    return new Date32Array(data);
                case ArrowTypeId.Time32:
                    return new Time32Array(data);
                case ArrowTypeId.Time64:
                    return new Time64Array(data);
                case ArrowTypeId.Duration:
                    return new DurationArray(data);
                case ArrowTypeId.Decimal32:
                    return new Decimal32Array(data);
                case ArrowTypeId.Decimal64:
                    return new Decimal64Array(data);
                case ArrowTypeId.Decimal128:
                    return new Decimal128Array(data);
                case ArrowTypeId.Decimal256:
                    return new Decimal256Array(data);
                case ArrowTypeId.Dictionary:
                    return new DictionaryArray(data);
                case ArrowTypeId.HalfFloat:
#if NET5_0_OR_GREATER
                    return new HalfFloatArray(data);
#else
                    throw new NotSupportedException("Half-float arrays are not supported by this target framework.");
#endif
                case ArrowTypeId.FixedSizeList:
                    return new FixedSizeListArray(data);
                case ArrowTypeId.Interval:
                    return IntervalArray.Create(data);
                default:
                    throw new NotSupportedException($"An ArrowArray cannot be built for type {data.DataType.TypeId}.");
            }
        }

        public static IArrowArray Slice(IArrowArray array, int offset, int length)
        {
            ArrayData newData = array.Data.Slice(offset, length);
            return BuildArray(newData);
        }
    }
}