OpportunityApplyDiscountController.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
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 *  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**/

/**
 * 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 OpportunityApplyDiscountController 
{
	public Decimal DiscountPercentage { get; set; } 
	
	private ApexPages.StandardController standardController = null;
	
	private ApexPages.StandardSetController standardSetController = null; 
	
	public OpportunityApplyDiscountController(ApexPages.StandardController controller)
	{
		standardController = controller;
	}
	
	public PageReference applyDiscount()
	{
		try
		{
			// Apply discount entered to the current Opportunity
			OpportunitiesService.applyDiscounts(
				new Set<ID> { standardController.getId() }, DiscountPercentage);
		}
		catch (Exception e)
		{
			ApexPages.addMessages(e);
		}		
		
		return ApexPages.hasMessages() ? null : standardController.view();				
	}

	public PageReference applyDiscounts()
	{
		try
		{
			// Apply discount entered to the selected Opportunities
			OpportunitiesService.applyDiscounts(
				new Map<Id, SObject>(standardSetController.getSelected()).keySet(), DiscountPercentage);
		}
		catch (Exception e)
		{
			ApexPages.addMessages(e);
		}		
		
		return ApexPages.hasMessages() ? null : standardController.view();				
	}
	
	public PageReference applyDiscountV1()
	{
		try
		{
			// Query Opportunity and line items to apply discount to
			Opportunity opportunity = 
				[select Id, Name, (select UnitPrice from OpportunityLineItems) 
				 from Opportunity o 
				 where Id = :standardController.getId()];
				 
			// Apply discount to line items
			Util.applyDiscount(opportunity, DiscountPercentage);
		}
		catch (Exception e)
		{
			ApexPages.addMessages(e);
		}
		
		return ApexPages.hasMessages() ? null : standardController.view();				
	}
	
	public PageReference applyDiscountV2()
	{
		try
		{
			// Query Opportunity and line items to apply discount to
			Opportunity opportunity = 
				[select Id, Name, DiscountType__c, 
					(select UnitPrice, PricebookEntry.Product2.DiscountingApproved__c from OpportunityLineItems) 
				 from Opportunity o 
				 where Id = :standardController.getId()];
				 
			// Apply discount to line items
			Util.applyDiscount(opportunity, DiscountPercentage);
		}
		catch (Exception e)
		{
			ApexPages.addMessages(e);
		}
		
		return ApexPages.hasMessages() ? null : standardController.view();				
	}	
}