#region License
/*
* Copyright 2002-2005 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#endregion
#region Imports
using System;
using System.ComponentModel;
using System.Globalization;
using Spring.Expressions;
#endregion
namespace Spring.Expressions{
/// <summary>
/// Converts string representation of expression into an instance of <see cref="IExpression"/>.
/// </summary>
/// <author>Aleksandar Seovic</author>
public class ExpressionConverter : TypeConverter
{
/// <summary>
/// Can we convert from a the sourcetype to a <see cref="IExpression"/>?
/// </summary>
/// <remarks>
/// <p>
/// Currently only supports conversion from a <see cref="System.String"/> instance.
/// </p>
/// </remarks>
/// <param name="context">
/// A <see cref="System.ComponentModel.ITypeDescriptorContext"/>
/// that provides a format context.
/// </param>
/// <param name="sourceType">
/// A <see cref="System.Type"/> that represents the
/// <see cref="System.Type"/> you want to convert from.
/// </param>
/// <returns><see langword="true"/> if the conversion is possible.</returns>
public override bool CanConvertFrom(
ITypeDescriptorContext context, Type sourceType)
{
return (sourceType == typeof(string));
}
/// <summary>
/// Convert from a <see cref="System.String"/> value to an
/// <see cref="IExpression"/> instance.
/// </summary>
/// <param name="context">
/// A <see cref="System.ComponentModel.ITypeDescriptorContext"/>
/// that provides a format context.
/// </param>
/// <param name="culture">
/// The <see cref="System.Globalization.CultureInfo"/> to use
/// as the current culture.
/// </param>
/// <param name="value">
/// The value that is to be converted.
/// </param>
/// <returns>
/// A <see cref="System.String"/> array if successful.
/// </returns>
public override object ConvertFrom(
ITypeDescriptorContext context, CultureInfo culture, object value)
{
return Expression.Parse(value as string);
}
}
}
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