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183 lines (160 loc) · 6.1 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace JSONstat.Models;
/// <summary>
/// The <c>category</c> object of a dimension: ordered ids plus per-category
/// labels, hierarchies, coordinates and units. Source: <c>../wiki/dimensions.md</c>.
/// </summary>
public sealed class Category
{
/// <summary>
/// Category ordering. Accepts the array form (<c>["M","F"]</c>) or the
/// object form (<c>{"M":0,"F":1}</c>) on read and always writes the object
/// form. <c>null</c> for constant dimensions without an index.
/// </summary>
[JsonPropertyName("index")]
[JsonConverter(typeof(CategoryIndexConverter))]
public Dictionary<string, int>? Index { get; set; }
/// <summary>Per-category labels (falls back to the id when absent).</summary>
[JsonPropertyName("label")]
public Dictionary<string, string>? Label { get; set; }
/// <summary>Hierarchical relationships (parent id -> child ids).</summary>
[JsonPropertyName("child")]
public Dictionary<string, string[]>? Child { get; set; }
/// <summary>Geographic coordinates [longitude, latitude].</summary>
[JsonPropertyName("coordinates")]
public Dictionary<string, double[]>? Coordinates { get; set; }
/// <summary>Units of measure for metric-role categories.</summary>
[JsonPropertyName("unit")]
public Dictionary<string, Unit>? Unit { get; set; }
/// <summary>Provider-specific extension properties.</summary>
[JsonExtensionData]
public IDictionary<string, JsonElement>? ExtensionData { get; set; }
private string[] _orderedIds = System.Array.Empty<string>();
private readonly Dictionary<string, int> _idToPos = new Dictionary<string, int>();
private bool _built;
/// <summary>Canonicalizes the category order. Called by the owning dimension.</summary>
internal void Build(int size)
{
if (_built) return;
if (Index != null && Index.Count > 0)
{
_orderedIds = Index.OrderBy(kv => kv.Value).Select(kv => kv.Key).ToArray();
}
else if (Label != null && Label.Count > 0)
{
_orderedIds = Label.Keys.ToArray();
}
else
{
int n = size > 0 ? size : 1;
_orderedIds = Enumerable.Range(0, n).Select(_ => "").ToArray();
}
_idToPos.Clear();
for (int i = 0; i < _orderedIds.Length; i++) _idToPos[_orderedIds[i]] = i;
_built = true;
}
private void EnsureBuilt()
{
if (!_built) Build(0);
}
private string LabelOf(string id) =>
Label != null && Label.TryGetValue(id, out var l) ? l : id;
private double[]? CoordinatesOf(string id) =>
Coordinates != null && Coordinates.TryGetValue(id, out var c) ? c : null;
private Unit? UnitOf(string id) =>
Unit != null && Unit.TryGetValue(id, out var u) ? u : null;
/// <summary>The category ids in order.</summary>
[JsonIgnore]
public IReadOnlyList<string> Ids
{
get { EnsureBuilt(); return _orderedIds; }
}
/// <summary>The category labels in order.</summary>
[JsonIgnore]
public IReadOnlyList<string> Labels
{
get { EnsureBuilt(); return _orderedIds.Select(LabelOf).ToArray(); }
}
/// <summary>The categories as entries.</summary>
[JsonIgnore]
public IReadOnlyList<CategoryEntry> Entries
{
get
{
EnsureBuilt();
return _orderedIds
.Select((id, i) => new CategoryEntry(id, LabelOf(id), i, CoordinatesOf(id), UnitOf(id)))
.ToArray();
}
}
/// <summary>Gets the category at the given index, or <c>null</c>.</summary>
public CategoryEntry? Entry(int index)
{
EnsureBuilt();
if (index < 0 || index >= _orderedIds.Length) return null;
var id = _orderedIds[index];
return new CategoryEntry(id, LabelOf(id), index, CoordinatesOf(id), UnitOf(id));
}
/// <summary>Gets the category with the given id, or <c>null</c>.</summary>
public CategoryEntry? Entry(string id)
{
EnsureBuilt();
if (!_idToPos.TryGetValue(id, out var i)) return null;
return new CategoryEntry(id, LabelOf(id), i, CoordinatesOf(id), UnitOf(id));
}
/// <summary>Position of a category id, or <c>null</c> when unknown.</summary>
public int? PositionOf(string id)
{
EnsureBuilt();
return _idToPos.TryGetValue(id, out var i) ? (int?)i : null;
}
}
/// <summary>
/// Reads a category <c>index</c> in either array or object form into a
/// <see cref="Dictionary{TKey, TValue}"/> of id -> position, and writes the
/// canonical object form.
/// </summary>
internal sealed class CategoryIndexConverter : JsonConverter<Dictionary<string, int>>
{
public override Dictionary<string, int> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var dict = new Dictionary<string, int>();
if (reader.TokenType == JsonTokenType.StartArray)
{
int pos = 0;
while (reader.Read() && reader.TokenType != JsonTokenType.EndArray)
{
dict[reader.GetString()!] = pos++;
}
}
else if (reader.TokenType == JsonTokenType.StartObject)
{
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.EndObject) break;
string key = reader.GetString()!;
if (!reader.Read()) throw new JsonException("Unexpected end of category index.");
dict[key] = reader.GetInt32();
}
}
else
{
throw new JsonException("category index must be an array or an object.");
}
return dict;
}
public override void Write(Utf8JsonWriter writer, Dictionary<string, int> value, JsonSerializerOptions options)
{
writer.WriteStartObject();
foreach (var kv in value.OrderBy(p => p.Value))
{
writer.WritePropertyName(kv.Key);
writer.WriteNumberValue(kv.Value);
}
writer.WriteEndObject();
}
}