//------------------------------------------------------------------------------
// <copyright file="HorizontalAlignConverter.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
//------------------------------------------------------------------------------

// 








namespace System.Web.UI.WebControls {

    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Globalization;

    internal class HorizontalAlignConverter : EnumConverter {

        static string[] stringValues = new String[(int) HorizontalAlign.Justify + 1];

        static HorizontalAlignConverter () { 
            stringValues[(int) HorizontalAlign.NotSet] = "NotSet";
            stringValues[(int) HorizontalAlign.Left] = "Left";
            stringValues[(int) HorizontalAlign.Center] = "Center";
            stringValues[(int) HorizontalAlign.Right] = "Right";
            stringValues[(int) HorizontalAlign.Justify] = "Justify";
        }

        // this constructor needs to be public despite the fact that it's in an internal
        // class so it can be created by Activator.CreateInstance.
        public HorizontalAlignConverter () : base(typeof(HorizontalAlign)) {}
        
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
            if (sourceType == typeof(string)) {
                return true;
            }
            else {
                return base.CanConvertFrom(context, sourceType);
            }
        }

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
            if (value == null)
                return null;

            if (value is string) {
                string textValue = ((string)value).Trim();
                if (textValue.Length == 0)
                    return HorizontalAlign.NotSet;

                switch (textValue) {
                    case "NotSet":
                        return HorizontalAlign.NotSet;
                    case "Left":
                        return HorizontalAlign.Left;
                    case "Center":
                        return HorizontalAlign.Center;
                    case "Right":
                        return HorizontalAlign.Right;
                    case "Justify":
                        return HorizontalAlign.Justify;
                }
            }
            return base.ConvertFrom(context, culture, value);
        }
        
        public override bool CanConvertTo(ITypeDescriptorContext context, Type sourceType) {
            if (sourceType == typeof(string)) {
                return true;
            }

            return base.CanConvertTo(context, sourceType);
        }
        
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
            if (destinationType == typeof(string) && ((int) value <= (int)HorizontalAlign.Justify)) {
                return stringValues[(int) value];
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
}