69 lines
2.0 KiB
C#
69 lines
2.0 KiB
C#
/*
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* dbMango
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*
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* Copyright 2025 Deutsche Bank AG
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Rms.Risk.Mango.Pivot.Core;
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public interface IPivotedData
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{
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public string Id { get; }
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/// <summary>
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/// name : column
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/// </summary>
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IReadOnlyCollection<string> Headers { get; }
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/// <summary>
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/// Get column positions. Beware that duplicate column will be missing.
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/// Only first unique occurrence of column name will be counted.
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/// </summary>
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Dictionary<string, int> GetColumnPositions()
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{
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var dict = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
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// this is safer than calling ToDictionary as it handles duplicate headers
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foreach ( var (key, pos) in Headers.Select((x, i) => (Key: x, Value: i)) )
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{
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dict.TryAdd(key, pos);
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}
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return dict;
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}
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/// <summary>
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/// Number of rows
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/// </summary>
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int Count { get; }
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/// <summary>
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/// Get element at (col, row)
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/// </summary>
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/// <param name="col"></param>
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/// <param name="row"></param>
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/// <returns></returns>
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object? Get( int col, int row );
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Type GetColumnType( int col );
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/// <summary>
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/// Create filtered copy of data. Filter func must return true if you want row to remain in the output copy.
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/// </summary>
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/// <param name="filter"></param>
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/// <returns></returns>
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IPivotedData Filter(Func<int, bool> filter);
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} |