PHP overloading ( method overloading and property overloading)

Hello All

Today I will focus on overloading method and property in PHP. Unlike other language Java/C# overloading is working in a little bit different way for PHP.

Normally we can overload a method by providing different/varying argument(s) ,but in PHP it should have to create through some magic methods.

These magic methods are as bellow:

(For overloading property)

void __set ( string $name , mixed $value )

mixed __get ( string $name )

bool __isset ( string $name )

void __unset ( string $name )

(For overloading method)

mixed __call ( string $name , array $arguments )

mixed __callStatic ( string $name , array $arguments )

It will be better to describe the operation inside code comment rather that bookish thing hear. Please go through the code comment to get know what is gonging over there to perform overloading .

<?php
class PhpOverloading {
  
  /* Property overloading -start- */
  private $_data = array ();
  
  public function __set($name, $value) {
    /*
     * set the key value in the $_data private
     * variable.
     * */
    $this->_data [$name] = $value;
  }
  
  public function __get($name) {
    /*
     * Retrieve the value of key which we have
     * set through __set method.
     * */
    return $this->_data [$name];
  }
  
  public function __isset($name) {
    /*
     * Check wheather the key exist or not. 
     * */
    return isset ( $this->_data [$name] );
  }
  
  public function __unset($name) {
    /*
     * Unset the value of key.
     * */
    unset ( $this->_data [$name] );
  }
  
  /* Property overloading -end- */
  
  /* Method overloading -start- */
  public function __call($name, $argument) {
    /*
     * perform your operation as needed,
     * I just used a switch case to show how 
     * we can set the dynamic method with parameters.
     * */
    
    switch ($name) {
      case ('First') :
        echo "This is the first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('Second') :
        echo "2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
  public static function __callstatic($name, $argument) {
    
    /*
     * It's similar as __call but works as static method
     * call. 
     * */
    switch ($name) {
      case ('FirstStatic') :
        echo "Static first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('SecondStatic') :
        echo "Static 2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Static method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
/* Method overloading -end- */
}
$phpOverloading = new PhpOverloading ();
echo 'Property overloading output -start-';
echo "<br /><br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
$phpOverloading->dynamicProperty = "new property injected";
echo "<br />";
echo $phpOverloading->dynamicProperty;
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
unset ( $phpOverloading->dynamicProperty );
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
echo "<br /><br />";
echo 'Property overloading output -end-';
echo "<br /><br />";
echo 'Method overloading output -start-';
echo '<br /><br />';
$phpOverloading->First ( 'one', 'two', 'three' );
echo "<br />";
$phpOverloading->Second ( '1', '2' );
echo "<br />";
$phpOverloading->UnHandledMethod ( '1', '2' );
echo "<br /><br />";
echo 'staic method overloading';
echo "<br /><br />";
PhpOverloading::FirstStatic ( 'one', 'two', 'three' );
echo "<br />";
PhpOverloading::SecondStatic ( '1', '2' );
echo "<br />";
PhpOverloading::UnHandledStaticMethod ( '1', '2' );
echo "<br /><br />";
echo 'Method overloading output -end-';
/*
 * final output is as bellow:
 
Property overloading output -start-
bool(false) 
new property injected
bool(true) 
bool(false) 
Property overloading output -end-
Method overloading output -start-
This is the first dyanamic method and arguments are one,two,three
2nd method and the arguments are 2 and 
Method unhandled with the name UnHandledMethod and arguments are 1,2
staic method overloading
Static first dyanamic method and arguments are one,two,three
Static 2nd method and the arguments are 2 and 
Static method unhandled with the name UnHandledStaticMethod and arguments are 1,2
Method overloading output -end-
 * 
 * */

You may check my other posts from my [ Blog ]

Please provide your feedback.

Thanks

That's all for today.

BYE

Control inside repeater row ASP.NET

Hello All

Few days back I was struggling with a repeater problem , where I have to get a value of dropdown list on a button click event which is inside repeater. Eventually I come up with a solution through googling. What I have faced was get the value of appropriate dropdown list while clicking the button of a particular repeater’s row.

It’s being hard to describe rather that visualize :) isn’t it ! ( proposed solution should be as image bellow)

    My aspx markup is as bellow :

 <asp:Repeater runat="server" ID="rptTeamInfo" OnItemDataBound="rptTeamInfo_ItemDataBound" OnItemCommand="rptTeamInfo_ItemCommand">
               <ItemTemplate>
                <div class="side2">
                <div class="form">
                    <a href="#">delete</a><a href="#">edit /</a>
                    <ul class="p2">           
                      <span class="style1">[ <%#Eval("team_name")%> ]</span> - [ <%#Eval("creation_date")%>]<br />
                      <span class="style2">[<asp:Label runat="server" Text="ADMIN bla bla bla"></asp:Label>] - [ <%#Eval("team_leader")%>]</span> - [ <%#Eval("description")%>]
                     </ul>
                </div>                                                                        
                <div class="form2">
                <asp:ImageButton id="imgAddToTeam"  CommandName="select" CommandArgument='<%# Eval("team_id") %>'  ImageUrl="images/Add_to_team.png" runat="server" style="margin:10px;" align="right"></asp:ImageButton>
                <asp:DropDownList ID="ddlUserList" runat="server">
                
                </asp:DropDownList>
                    
                </div>
                <div class="row1">
                        <ul class="column">
                            <p><img src="images/name.png" /> Name</p>
                        </ul>
                        <ul class="column2">
                            <p><img src="images/username.png" /> Username</p>
                        </ul>
                        <ul class="column3">
                            <p><img src="images/username.png" /> Access</p>
                        </ul>
                </div>
                <div class="row2">                
                 <asp:Repeater ID="rptUserInfo"  OnItemDataBound="rptUserInfo_ItemDataBound" runat="server">
                       <ItemTemplate>
                    <asp:LinkButton id="lnkUserDelete" onclick="lnkUserDelete_Click" runat="server">delete</asp:LinkButton>
                    <ul class="column">
                        <p> <asp:Label runat="server" id="lblFirstNameIn"></asp:Label> <asp:Label runat="server" id="lblLastNameIn"></asp:Label></p>
                    </ul>
                    <ul class="column2">
                        <p> <asp:Label runat="server" id="lblUserIDIn"></asp:Label></p>
                    </ul>
                    <ul class="column3">
                        <p><asp:Label runat="server" id="lblUserTypeIn"></asp:Label></p>
                    </ul>
                        </ItemTemplate>                             
                 </asp:Repeater>                
                </div>
            </div>
               </ItemTemplate>
               </asp:Repeater>

And my code behind file is as bellow :

using System;
using System.Web.UI.WebControls;
using ClassLibrary1.UTILITY;

namespace WebDoc
{
    public partial class ManageTeam : System.Web.UI.Page
    {
        public int CurrentTeamID { get; set; }

        protected void Page_Load(object sender, EventArgs e)
        {
            lblUserId.Text = BUSessionUtility.BUSessionContainer.UserName;
            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();
            rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

            rptTeamInfo.DataBind();

        }
        protected void btnLogOut_Click(object sender, EventArgs e)
        {
            BUSessionUtility.BUSessionContainer.UserName = string.Empty;
            BUSessionUtility.BUSessionContainer.UserType = string.Empty;
            Response.Redirect("~/LoginUI.aspx");
        }

        protected void rptTeamInfo_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            DropDownList ddlUserList = (DropDownList)(e.Item.FindControl("ddlUserList"));

            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();
            ddlUserList.DataSource = manageTeamDAL.GetUsersByManagerID(BUSessionUtility.BUSessionContainer.UserName);
            ddlUserList.DataTextField = "id";
            ddlUserList.DataValueField = "id";
            ddlUserList.DataBind();

            Repeater rptUserInfo = (Repeater)(e.Item.FindControl("rptUserInfo"));

            var row = e.Item.DataItem;
            rptUserInfo.DataSource = manageTeamDAL.GetUsersByAssignedTeamID(((team_info)(row)).team_id);
            rptUserInfo.DataBind();


        }

        protected void rptTeamInfo_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            if (e.CommandName == "select")
            {
                ImageButton imgAddToTeam = (ImageButton)e.CommandSource;

                DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");

                ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

                manageTeamDAL.AssignUserInTeam(int.Parse(imgAddToTeam.CommandArgument), ddlUserList.SelectedValue.ToString());

                rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

                rptTeamInfo.DataBind();
            }
        }

        protected void rptUserInfo_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            Label lblFirstName = (Label)(e.Item.FindControl("lblFirstNameIn"));
            Label lblLastName = (Label)(e.Item.FindControl("lblLastNameIn"));
            Label lblUserID = (Label)(e.Item.FindControl("lblUserIDIn"));
            Label lblUserType = (Label)(e.Item.FindControl("lblUserTypeIn"));
            LinkButton lnkUserDelete = (LinkButton)(e.Item.FindControl("lnkUserDelete"));

            var row = e.Item.DataItem;

            lblFirstName.Text = ((user_info)(row)).f_name;
            lblLastName.Text = ((user_info)(row)).l_name;
            lblUserID.Text = ((user_info)(row)).id;
            lblUserType.Text = ((user_info)(row)).user_type;
            lnkUserDelete.CommandArgument = ((user_info)(row)).id;


        }

        protected void lnkUserDelete_Click(object sender, EventArgs e)
        {
            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

            manageTeamDAL.DeleteUserformTeam(((LinkButton)(sender)).CommandArgument);

            rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

            rptTeamInfo.DataBind();
        }

    }
}

Not all codes are important here and I will escape the data binding part as its not the focus of today’s topic. Now I will focus what we should do to perform our basic task.

first of all we have to do one most important  thing *** MAKE    EnableViewState="false" *** If ViewState is in true condition your are not going to handle  OnItemCommand event which will significantly react for your particular row’s activity.

 <asp:Repeater runat="server" ID="rptTeamInfo" OnItemDataBound="rptTeamInfo_ItemDataBound" OnItemCommand="rptTeamInfo_ItemCommand">

<ItemTemplate>

<asp:ImageButton id="imgAddToTeam" CommandName="select" CommandArgument='<%# Eval("team_id") %>' ImageUrl="images/Add_to_team.png" runat="server" style="margin:10px;" align="right"></asp:ImageButton>

<asp:DropDownList ID="ddlUserList" runat="server">

</asp:DropDownList>

</ItemTemplate>

</asp:Repeater>

The event handler “rptTeamInfo_ItemCommand” for the the event “OnItemCommand” is as bellow.

protected void rptTeamInfo_ItemCommand(object source, RepeaterCommandEventArgs e)
{
    if (e.CommandName == "select")
    {
        ImageButton imgAddToTeam = (ImageButton)e.CommandSource;
        
        DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");
    
        ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

        manageTeamDAL.AssignUserInTeam( int.Parse(imgAddToTeam.CommandArgument),ddlUserList.SelectedValue.ToString() );

        rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

        rptTeamInfo.DataBind();
    }
}

We are passing the “CommandName” and “CommandArgument” through our image button which will check the command name in code behind and act with the command argument parameter.

We can get our ImageButton and DropdownList is as bellow from our code behind.

ImageButton imgAddToTeam = (ImageButton)e.CommandSource;

DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");

And selet the value of dropdown as bellow.

ddlUserList.SelectedValue

In this way we can accomplish our task regarding the repeater row’s control manipulation.

Thats all for today.

BYE

Dependency Injection with Ninject in .NET

Hello All

From last few months I was not working on .NET platform so haven’t get enough time to write something fruitful on .NET technology. But from last few few days I was thinking to do something with IoC . There are many DI tools to perform DI in .NET but I found Ninject useful as well as light waited and easily implementable. So lets start to make our hand dirty with the Ninject (there are many advanced level use of Ninject library but in this article I will simply show how to do DI with Ninject framework).

My project structure is as following .

In this example I’m taking 2 types of engine and 2 types of set and through Ninject DI I’ll inject one of each for a car. Fore the sake of simplicity I will place the code file accordingly and describe through code comment.

In my “DependencyInjection.Core” project I took 2 interfaces: 1.IEngine  2.ISeat

IEngine.cs is as following :

namespace DependencyInjection.Core
{
   public interface IEngine
    {
       string EngineType(string carName);
    }
}

I’m also taking 2 other classes 1.DieselEngine and 2.PetrolEngine  . Both of the classes implements IEngine interface.
DieselEngine.cs is as following :

namespace DependencyInjection.Core
{
   public  class DieselEngine : IEngine
    {
       public string EngineType(string carName)
       {
           return string.Format("This {0} runs on diesel.", carName);
       }
    }
}

PetrolEngine.cs is as following :

namespace DependencyInjection.Core
{
  public class PetrolEngine : IEngine
    {
        public string EngineType(string carName)
        {
            return string.Format("This {0} runs on petrol.", carName);
        }
    }
}

Now start for another type of interface implementation ISeat . This part also is as above.
ISeat.cs is as following :

namespace DependencyInjection.Core
{
   public interface ISeat
    {
       string SeatType(string carName);
    }
}

Two other classes 1.LeatherSeat and 2.PlasticSeat  . Both of the classes implements ISeat interface.
LeatherSeat.cs is as follwong:

namespace DependencyInjection.Core
{
   public class LeatherSeat : ISeat
    {
        #region ISeat Members

        public string SeatType(string carName)
        {
          return string.Format( "This {0}'s seats are of leather.",carName);
        }

        #endregion       
    }
}

PlasticSeat.cs is as following :

namespace DependencyInjection.Core
{
   public class PlasticSeat : ISeat
    {
        #region ISeat Members

        public string SeatType(string carName)
        {
            return string.Format("This {0}'s seats are of plastic.", carName);
        }

        #endregion
    }
}

In this point I’m adding reference of “Ninject.Core.dll” with my  “DependencyInjection.Core” project which I have downloaded from Ninject’s site. Now in my main class “Car” I’m going to inject one type of engine and another type of seat which I have mapped (DI mapping) through “IocMapper” class as bellow.
Car.cs is as bellow :

using Ninject.Core;

namespace DependencyInjection.Core
{
    public class Car
    {
        public IEngine CarEngine { get; set;}
        public ISeat   CarSeat   { get; set;}

        [Inject]
        public Car(IEngine engine , ISeat seat)
        {
            CarEngine   = engine;
            CarSeat     = seat;
        }

        
        public string GetEngineInformation(string carName)
        {
           return CarEngine.EngineType(carName);
        }


        public string GetSeatInformation(string carName)
        {
            return CarSeat.SeatType(carName);
        }
    }
}

In the above file  “ [Inject] “ attribute is place above the Car constructer to make it definable to Ninject so that Ninject can inject mapped object as described in “IocMapper” class.
I have taken another console application project named “DependencyInjection” in which I placed my “IocMapper” class.
IocMapper.cs is as following :

using Ninject.Core;

using DependencyInjection.Core;

namespace DependencyInjection
{
    public class IocMapper : StandardModule
    {
        public override void Load()
        {
            Bind<IEngine>().To<DieselEngine>();
         
            Bind<ISeat>().To<LeatherSeat>();
        }
    }
}

Now in program class I defined the kernel constructer and and initialize my car object.
Program.cs file is as bellow :

using System;
using Ninject.Core;
using DependencyInjection.Core;

namespace DependencyInjection
{
    class Program
    {
        static void Main(string[] args)
        {
            IKernel kernel = new StandardKernel(new IocMapper());

            Car car = new Car(kernel.Get<IEngine>(), kernel.Get<ISeat>());

            Console.WriteLine(car.GetEngineInformation("Toyota"));
           
            Console.WriteLine(car.GetSeatInformation("BMW"));
            
            Console.ReadKey();

        }
    }
}

We can do more advance level of conditional binding with Ninject. Hope in near future I will throw a post on advance use of Ninject.
That’s all for today.
BYE