using System;
using System.Reflection;

/// <header>
/// <wox>
///     <version>1.0</version>
///     <author>Carlos R. Jaimez Gonzalez</author>
///     <author>Simon M. Lucas</author>
///     <site>http://woxserializer.sourceforge.net/</site>
/// </wox>
/// <wox>
///     <version>1.5</version>
///     <author>Steven M Lewis</author>
/// </wox>
/// <wox>
///     <version>2.0</version>
///     <author>George A Smith</author>
///     <svn>http://woxserializer.sourceforge.net/</svn>
///     <note>XML form for vs 2 is more compact and therefor incompatible with vs 1</note>
/// </wox>
/// </header>

namespace wox.serial
{
    public abstract class AbstractStringableHandler : AbstractHandler, WoxIsAHandler
    {
        #region WoxIsAHandler Members

        public abstract bool IsFor( Type pType );

        public override object ReadObject( WoxHandlers pWoxHandlers, WoxReader pWoxReader, XMLreader pReader )
        {
            try
            {
                string zValue = pReader.GetAttribute( Serial.VALUE );
                return CreateInstance( zValue );
            }
            catch ( Exception e )
            {
                throw new ApplicationException( GetType().Name + " Exception is: " + e.Message, e );
            }
        }

        public override void WriteObject( WoxHandlers pWoxHandlers, WoxWriter pWoxWriter, object pObject, FieldInfo pField, XMLwriter pWriter, bool pJustType )
        {
            pWriter.WriteStartElement( Serial.OBJECT );

            string zValue = Stringify( pObject );
            if ( zValue != null )
            {
                pWriter.WriteAttributeString( Serial.TYPE, GetWoxTypeFor( pWoxHandlers, pObject.GetType(), pField, pJustType ) );
                pWriter.WriteAttributeString( Serial.VALUE, zValue );
            }

            pWriter.WriteEndElement();
        }

        public override object ParseFieldValue( string pFieldValue )
        {
            return CreateInstance( pFieldValue );
        }

        public override string CreateFieldValue( object pFieldValue )
        {
            return Stringify( pFieldValue );
        }

        #endregion

        abstract protected object CreateInstance( string pValue );

        protected virtual string Stringify( object pObject )
        {
            return (pObject == null) ? Serial.NULL : pObject.ToString();
        }
    }
}