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MultiPolygon.cs
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// Copyright © Joerg Battermann 2014, Matt Hunt 2017
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text.Json.Serialization;
using GeoJSON.Text.Converters;
namespace GeoJSON.Text.Geometry
{
/// <summary>
/// Defines the MultiPolygon type.
/// </summary>
/// <remarks>
/// See https://tools.ietf.org/html/rfc7946#section-3.1.7
/// </remarks>
public class MultiPolygon : GeoJSONObject, IGeometryObject, IEqualityComparer<MultiPolygon>, IEquatable<MultiPolygon>
{
public MultiPolygon() { }
/// <summary>
/// Initializes a new instance of the <see cref="MultiPolygon" /> class.
/// </summary>
/// <param name="polygons">The polygons contained in this MultiPolygon.</param>
public MultiPolygon(IEnumerable<Polygon> polygons)
{
Coordinates = new ReadOnlyCollection<Polygon>(
polygons?.ToArray() ?? throw new ArgumentNullException(nameof(polygons)));
}
/// <summary>
/// Initializes a new <see cref="MultiPolygon" /> from a 4-d array of <see cref="double" />s
/// that matches the "coordinates" field in the JSON representation.
/// </summary>
// [JsonConstructor]
public MultiPolygon(IEnumerable<IEnumerable<IEnumerable<IEnumerable<double>>>> coordinates)
: this(coordinates?.Select(polygon => new Polygon(polygon))
?? throw new ArgumentNullException(nameof(coordinates)))
{
}
[JsonPropertyName("type")]
[JsonIgnore(Condition = JsonIgnoreCondition.Never)]
public override GeoJSONObjectType Type => GeoJSONObjectType.MultiPolygon;
/// <summary>
/// The list of Polygons enclosed in this <see cref="MultiPolygon"/>.
/// </summary>
[JsonPropertyName("coordinates")]
[JsonConverter(typeof(PolygonEnumerableConverter))]
public ReadOnlyCollection<Polygon> Coordinates { get; set; }
#region IEqualityComparer, IEquatable
/// <summary>
/// Determines whether the specified object is equal to the current object
/// </summary>
public override bool Equals(object obj)
{
return Equals(this, obj as MultiPolygon);
}
/// <summary>
/// Determines whether the specified object is equal to the current object
/// </summary>
public bool Equals(MultiPolygon other)
{
return Equals(this, other);
}
/// <summary>
/// Determines whether the specified object instances are considered equal
/// </summary>
public bool Equals(MultiPolygon left, MultiPolygon right)
{
if (base.Equals(left, right))
{
return left.Coordinates.SequenceEqual(right.Coordinates);
}
return false;
}
/// <summary>
/// Determines whether the specified object instances are considered equal
/// </summary>
public static bool operator ==(MultiPolygon left, MultiPolygon right)
{
if (ReferenceEquals(left, right))
{
return true;
}
if (ReferenceEquals(null, right))
{
return false;
}
return left != null && left.Equals(right);
}
/// <summary>
/// Determines whether the specified object instances are not considered equal
/// </summary>
public static bool operator !=(MultiPolygon left, MultiPolygon right)
{
return !(left == right);
}
/// <summary>
/// Returns the hash code for this instance
/// </summary>
public override int GetHashCode()
{
int hash = base.GetHashCode();
foreach (var item in Coordinates)
{
hash = (hash * 397) ^ item.GetHashCode();
}
return hash;
}
/// <summary>
/// Returns the hash code for the specified object
/// </summary>
public int GetHashCode(MultiPolygon other)
{
return other.GetHashCode();
}
#endregion
}
}