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using System;
using System.Collections.Generic;
using System.Text;
using Marina.Domain.Interfaces;
namespace Marina.Domain {
public class Utilities {
public static readonly IUtility Water = new Utility( "Water" );
public static readonly IUtility Electrical = new Utility( "Electrical" );
private static readonly IUtility None = new Utility( "None" );
public static IUtility For( params IUtility[] utilities ) {
if ( null != utilities && 0 < utilities.Length ) {
return new UtilityComposite( utilities );
}
return None;
}
private class Utility : IUtility, IEquatable< Utility > {
private readonly string _name;
public Utility( string name ) {
_name = name;
}
public bool IsEnabled( IUtility utility ) {
return Equals( utility );
}
public bool Equals( Utility utility ) {
if ( utility == null ) {
return false;
}
return Equals( _name, utility._name );
}
public override bool Equals( object obj ) {
if ( ReferenceEquals( this, obj ) ) {
return true;
}
return Equals( obj as Utility );
}
public override int GetHashCode() {
return _name.GetHashCode( );
}
public override string ToString() {
return _name;
}
}
private class UtilityComposite : IUtility {
private readonly IEnumerable< IUtility > _utilities;
public UtilityComposite( params IUtility[] utilities ) {
_utilities = new List< IUtility >( utilities );
}
public bool IsEnabled( IUtility utility ) {
return Equals( utility );
}
public override bool Equals( object obj ) {
if ( ReferenceEquals( this, obj ) ) {
return true;
}
foreach ( IUtility utility in _utilities ) {
if ( utility != null ) {
if ( utility.Equals( obj ) ) {
return true;
}
}
}
return false;
}
public override int GetHashCode() {
return 0;
}
public override string ToString() {
StringBuilder builder = new StringBuilder( );
foreach ( IUtility utility in _utilities ) {
builder.Append( utility.ToString( ) );
}
return builder.ToString( );
}
}
}
}
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