PlSqlBlock.cs

Go to the documentation of this file.

// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.Collections.Generic;
using System.Linq;

using Deveel.Data.Sql.Expressions;

namespace Deveel.Data.Sql.Statements {
    public class PlSqlBlock : IPreparable, IDisposable {
        private ICollection<SqlStatement> statements;
        private ICollection<ExceptionHandler> exceptionHandlers; 
         
        public PlSqlBlock() {
            statements = new List<SqlStatement>();
            exceptionHandlers = new List<ExceptionHandler>();
        }

        ~PlSqlBlock() {
            Dispose(false);
        }

        public string Label { get; set; }

        public IEnumerable<SqlStatement> Statements {
            get { return statements.AsEnumerable(); }
        }

        public IEnumerable<ExceptionHandler> ExceptionHandlers {
            get { return exceptionHandlers.AsEnumerable(); }
        }

        public void AddStatement(SqlStatement statement) {
            // TODO: make further checks, such as if a labeled statement with
            //       the same label already exists
            statements.Add(statement);
        }

        public void AddExceptionHandler(ExceptionHandler handler) {
            // TODO: make further checks here ...
            exceptionHandlers.Add(handler);
        }

        /*
        protected virtual BlockExecuteContext CreateExecuteContext() {
            throw new NotImplementedException();
        }
        */

        protected virtual PlSqlBlock Prepare(IExpressionPreparer preparer) {
            throw new NotImplementedException();
        }

        object IPreparable.Prepare(IExpressionPreparer preparer) {
            return Prepare(preparer);
        }

        public void Dispose() {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing) {
            if (disposing) {
                if (statements != null)
                    statements.Clear();
                if (exceptionHandlers != null)
                    exceptionHandlers.Clear();
            }

            statements = null;
            exceptionHandlers = null;
        }
    }
}