OpportunityCreateInvoiceController.cls

/**
 * Copyright (c) 2012, FinancialForce.com, inc
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, 
 *   are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, 
 *      this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *      this list of conditions and the following disclaimer in the documentation 
 *      and/or other materials provided with the distribution.
 * - Neither the name of the FinancialForce.com, inc nor the names of its contributors 
 *      may be used to endorse or promote products derived from this software without 
 *      specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 *  THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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**/

/**
 * This controller contains for reference different versions of the controller methods for illustration
 *   the current controller method used by the page represents the pattern based implementaiton approach
 **/
public with sharing class OpportunityCreateInvoiceController 
{
	public Decimal DiscountPercentage { get; set; } 
		
	private ApexPages.StandardController standardController = null; 
	
	public OpportunityCreateInvoiceController(ApexPages.StandardController controller)
	{
		standardController = controller;
	}

	public PageReference createInvoice()
	{
		try
		{
			// Create Invoice from line items of the current Opportunity
			List<ID> invoiceIds = 
				OpportunitiesService.createInvoices(
					new Set<ID> { standardController.getId() }, DiscountPercentage);
			
			// Redirect to Invoice 
			return new PageReference('/'+invoiceIds[0]);									
		}
		catch (Exception e)		
		{
			ApexPages.addMessages(e);			
		}	
				
		return ApexPages.hasMessages() ? null : standardController.view();
	}
	
	public PageReference createInvoiceV1()
	{
		try
		{
			// Query Opportunity and line items to apply discount to
			Opportunity opportunity = 
				[select Id, Name, AccountId,
					(select UnitPrice, Description, Quantity from OpportunityLineItems) 
				 from Opportunity o 
				 where Id = :standardController.getId()];
				 
			// Apply discount to line items
			Util.applyDiscount(opportunity, DiscountPercentage);
			
			// Create Invoice from line items
			Id invoiceId = Util.createInvoice(opportunity);
			
			// Redirect to Invoice 
			return new PageReference('/'+invoiceId);
		}
		catch (Exception e)
		{
			ApexPages.addMessages(e);
		}
		
		return ApexPages.hasMessages() ? null : standardController.view();
	}
}