#region License
// 
// Copyright (c) 2007-2009, Sean Chambers <schambers80@gmail.com>
// 
// 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

using System;
using System.Collections.Generic;
using FluentMigrator.Infrastructure;
using FluentMigrator.Model;

namespace FluentMigrator.Expressions
{
    public class AlterColumnExpression : MigrationExpressionBase
    {
        public virtual string SchemaName { get; set; }
        public virtual string TableName { get; set; }
        public virtual ColumnDefinition Column { get; set; }

        public AlterColumnExpression()
        {
            Column = new ColumnDefinition() { ModificationType = ColumnModificationType.Alter };
        }

        public override void CollectValidationErrors(ICollection<string> errors)
        {
            if (String.IsNullOrEmpty(TableName))
                errors.Add(ErrorMessages.TableNameCannotBeNullOrEmpty);

            Column.CollectValidationErrors(errors);
        }

        public override void ExecuteWith(IMigrationProcessor processor)
        {
            Column.TableName = TableName;
            processor.Process(this);
        }

        public override string ToString()
        {
            return base.ToString() + TableName + " " + Column.Name + " " + Column.Type ?? Column.CustomType;
        }
    }
}
