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using System;
using System.Collections.Specialized;
namespace Marina.Presentation
{
public class PayloadKey< T > : IEquatable< PayloadKey< T > >
{
private readonly string _key;
public PayloadKey( string key )
{
_key = key;
}
public T ParseFrom( NameValueCollection payload )
{
EnsureKeyIsInPayload( payload );
return ( T )Convert.ChangeType( payload[ _key ], typeof( T ) );
}
private void EnsureKeyIsInPayload( NameValueCollection payload )
{
if( null == payload[ _key ] ) {
throw new PayloadKeyNotFoundException( _key );
}
}
public static implicit operator string( PayloadKey< T > item )
{
return item._key;
}
public bool Equals( PayloadKey< T > payloadKey )
{
return payloadKey != null && Equals( _key, payloadKey._key );
}
public override bool Equals( object obj )
{
return ReferenceEquals( this, obj ) || Equals( obj as PayloadKey< T > );
}
public override int GetHashCode( )
{
return _key.GetHashCode( );
}
}
}
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