Using Silverlight in Enterprise: RAD of User Friendly Database Access

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 *  FulcrumWeb RAD Framework - Fulcrum of your business             *
 *  Copyright (c) 2002-2009 FulcrumWeb, ALL RIGHTS RESERVED         *
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 *  THE SOURCE CODE CONTAINED WITHIN THIS FILE AND ALL RELATED      *
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using System;
using Framework.Silverlight.Client.AppServer;


namespace Framework.Silverlight.Client
{
    /// <summary>
    /// Provides a base logic for attribute validation.
    /// </summary>
    public abstract class CxBaseAttributeValidator
    {
        /// <summary>
        /// Type of attribute metadata that should be validate.
        /// </summary>
        public abstract string TargetAttributeType { get; }
        //----------------------------------------------------------------------------
        /// <summary>
        /// Validates the value usings corresponding attribute metadata.
        /// </summary>
        /// <param name="attributeMetadata">The attribute metadata that will be 
        /// used in validation.</param>
        /// <param name="value">The value to validation.</param>
        public virtual void Validate(CxClientAttributeMetadata attributeMetadata, object value)
        {
            ValidateOnNullable(attributeMetadata, value);
        }
        //----------------------------------------------------------------------------
        /// <summary>
        /// Validates the value usings the 'Nullable' property in corresponding attribute metadata.
        /// </summary>
        /// <param name="attributeMetadata">The attribute metadata that will be 
        /// used in validation.</param>
        /// <param name="value">The value to validation.</param>
        /// <returns></returns>
        protected virtual bool ValidateOnNullable(CxClientAttributeMetadata attributeMetadata, object value)
        {
            if(!attributeMetadata.Nullable && value == null)
            {
                //TODO: multilingual
                throw new ExAttributeValidationException("The attribute '{0}' can not be null.", 
                    attributeMetadata.FormCaption);
            }
            return true;
        }
        //----------------------------------------------------------------------------
        /// <summary>
        /// Validates the string value usings the 'MaxLength' property in corresponding attribute metadata.
        /// </summary>
        /// <param name="attributeMetadata">The attribute metadata that will be 
        /// used in validation.</param>
        /// <param name="value">The string value to validation.</param>
        /// <returns></returns>
        protected virtual bool ValidateOnStringMaxLength(CxClientAttributeMetadata attributeMetadata, string value)
        {
            if (value == null)
            {
                return true;
            }
            if (attributeMetadata.MaxLength > 0 && value.Length > attributeMetadata.MaxLength)
            {
                //TODO: multilingual
                throw new ExAttributeValidationException(
                    @"The length of attribute '{0}'
                    can not be more then {1}.",
                    attributeMetadata.FormCaption, attributeMetadata.MaxLength);
            }
            return true;
        }
        //----------------------------------------------------------------------------
        /// <summary>
        /// Validates the range of numeric value usings the 'MaxLength' property in corresponding attribute metadata.
        /// </summary>
        /// <param name="attributeMetadata">The attribute metadata that will be 
        /// used in validation.</param>
        /// <param name="value">The numeric value to validation.</param>
        /// <returns></returns>
        protected virtual bool ValidateOnRange(CxClientAttributeMetadata attributeMetadata, decimal value)
        {
            if (value > Convert.ToDecimal( attributeMetadata.MaxValue) ||
                value < Convert.ToDecimal(attributeMetadata.MinValue))
            {
                //TODO: multilingual
                throw new ExAttributeValidationException(
                    "@The range of attribute '{0}' should be between {1} and {2}.",
                    attributeMetadata.FormCaption,
                    attributeMetadata.MinValue,
                    attributeMetadata.MaxValue);
            }
            return true;
        }
        

    }
}