90 lines
2.6 KiB
C#
90 lines
2.6 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.Models;
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public static class SimpleTranspose
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{
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public static IPivotedData? Transpose(IPivotedData? src)
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{
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if ( src == null
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|| src.Count < 1
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|| src.Headers.Count < 1
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|| src is { Count: 1, Headers.Count: 1 }
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)
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{
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return src;
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}
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var columnHeaders = GetColHeaders(src);
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if ( columnHeaders == null || columnHeaders.Count != src.Count+1 )
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return src;
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var headers = columnHeaders
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.OrderBy(x => x.Value)
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.Select(x => x.Key)
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.ToArray();
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var dest = new ArrayBasedPivotData(headers);
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var srcHeaders = src.Headers;
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// row and col corresponds to dest
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for ( var row = 0; row < srcHeaders.Count-1; row++ )
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{
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var r = new object?[src.Count+1];
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// first column is src.Headers
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r[0] = srcHeaders.Skip(row+1).First(); // [row+1]
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// the rest (1st src column becomes dest row header)
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for ( var col = 1; col < headers.Length; col++ )
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r[col] = src.Get(row+1, col-1); // note reverse row/col
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dest.Add(r);
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}
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// double check
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if ( dest.Count != src.Headers.Count-1
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|| dest.Headers.Count != src.Count+1 )
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{
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return src;
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}
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return dest;
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}
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private static Dictionary<string, int>? GetColHeaders(IPivotedData src)
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{
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var headers = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase)
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{
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[src.Headers.First() ?? string.Empty] = 0
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};
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for ( var i = 0; i < src.Count; i++ )
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{
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var key = src.Get(0, i)?.ToString() ?? string.Empty;
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if ( key == string.Empty )
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key = "-";
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if ( !headers.TryAdd(key, i+1) )
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return null;
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}
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return headers;
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}
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} |