/**
 *    Description    :    Dynamic Look-up having lookup of all the object in the Org.
 *
 *    Created By     :    Abhi Tripathi
 *
 *    Created Date   :    4/8/2014
 *
 *    Version        :    V1.0
 **/
public with sharing class DynamicLookupController {

	//Select Option for objects
    public List<SelectOption> options { get; set; }
    
    //Boolean
    public Boolean IsSelected { get; set; }
    
    //Variable to hold the selected value
    public String selectedValue { get; set; }
    
    //vaiable to hold value of Id
    public String valueToUpdate { get; set; }
    
    //variable to hold the prefix of the Object Id
    public String strKeyPrefix { get; set; }
    
    /**
     *    Description    :    Method to get the selected Name of the object and get its prefix.
     *
     *    @args          :  
     *
     *    @return        :  
    **/
    public void updateLookupField(){
    
		if( selectedValue != null && selectedValue != ''){
            IsSelected = true;
            
            //Assigning values
            strKeyPrefix =  String.valueOf(selectedValue) ;   
            System.debug('@@@@@@@@@@@' +selectedValue );
       
        } else {
            IsSelected = false;
        }
    }
    
    //Constructor
    public DynamicLookupController() {
    
		//Initiallizing
        IsSelected = false;
        
        //memory allocation and default value assignment
        options = new List<SelectOption>();
        options.add(new SelectOption('','--Select One--'));                                                                 
        
        //Loop through sObject list using schema methods
        for(Schema.SObjectType sobj : Schema.getGlobalDescribe().Values()) {
            schema.DescribeSObjectResult f = sobj.getDescribe();
          
            //filtering the sobject list 
            if(f.isDeletable() && f.isQueryable() && f.isUpdateable() && f.isAccessible() && f.getkeyPrefix() != Null){
          
                //populate list with options
                options.add(new SelectOption(f.getkeyPrefix(), f.getLabel()));
            }
        } 
        
        //sorting the list alphabetially   
        options.sort();
    }  
}