RelationalDatabaseHolder.cs :  » Persistence-Frameworks » Persist.NET » Persist » Config » C# / CSharp Open Source

using System;
using System.Collections.Specialized;

using Persist.Sql;

namespace Persist.Config{
   /// <summary>
   /// Manage a RelationalDatabase object
   /// </summary>
  public class RelationalDatabaseHolder
  {
      private string              theName;
      private string              theTypeName;
      private NameValueCollection theParameters;
      private RelationalDatabase  theRelationalDatabase;
      private bool                isInitialized;

      /// <summary>
      /// Manage a RelationalDatabase object
      /// </summary>
      /// <param name="name">the RelationalDatabase name</param>
      /// <param name="typeName">the Type name</param>
      /// <param name="parameters">the Parameters used during initialization of the Relationaldatabase object</param>
    public RelationalDatabaseHolder(string name,string typeName,NameValueCollection parameters)
    {
         theName = name;
         theTypeName = typeName;
         theParameters = parameters;
         isInitialized = false;
    }

      /// <summary>
      /// Initialize the RelationalDatabaseHolder
      /// </summary>
      public void Init()
      {
         lock(this)
         {
            if(isInitialized)
            {
               throw new ConfigurationException("DatabaseHolder Already Initialized");
            }
            theRelationalDatabase = (RelationalDatabase)Activator.CreateInstance(Type.GetType(theTypeName));
            theRelationalDatabase.Name = theName;
            theRelationalDatabase.Init(theParameters);
            isInitialized = true;
            
         }
      }

      /// <summary>
      /// The RelationalDatabase name
      /// Cannot be changed once Initialized
      /// </summary>
      public string Name
      {
         get{return theName;}
         set
         {
            if(isInitialized) throw new Exception("Name of RelationalDatabaseHolder cannot be changed once initialized");
            theName = value;
         }
      }

      /// <summary>
      /// The RelationalDatabase TypeName
      /// Cannot be changed once Initialized
      /// </summary>
      public string TypeName
      {
         get{return theTypeName;}
         set
         {
            if(isInitialized) throw new Exception("TypeName of RelationalDatabaseHolder cannot be changed once initialized");
            theTypeName = value;
         }
      }

      /// <summary>
      /// the RelationalDatabase Initialization parameters
      /// Any change after initialization will not be taken into account
      /// </summary>
      public NameValueCollection Parameters
      {
         get{return theParameters;}
      }

      /// <summary>
      /// Return the RelationalDatabase Instance
      /// </summary>
      public RelationalDatabase Instance
      {
         get
         {
            if(!isInitialized)throw new Exception("RelationalDatabaseHolder not Initialized, cannot return Instance");
            return theRelationalDatabase;
         }
      }
  }
}