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using System.Diagnostics;
using System.Data;
using System.Collections;
using Microsoft.VisualBasic;
using System.Collections.Generic;
using System;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;

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/**
 * This class contains unit tests for validating the behavior of Apex classes
 * and triggers.
 *
 * Unit tests are class methods that verify whether a particular piece
 * of code is working properly. Unit test methods take no arguments,
 * commit no data to the database, and are flagged with the testMethod
 * keyword in the method definition.
 *
 * All test methods in an organization are executed whenever Apex code is deployed

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global class CL_BATCH_update_Purchases implements Database.Batchable<sObject> {
	
	public CL_BATCH_update_Purchases(){} 
	
	global Database.QueryLocator start(Database.BatchableContext BC){
		String query='Select Id from SFDC_Purchase_Order__c';
		return Database.getQueryLocator(query);
	}

	global void execute(Database.BatchableContext BC,List<SFDC_Purchase_Order__c> scope){		

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global class CL_Schedulable_update_Purchases implements Schedulable {
	
	global void execute(SchedulableContext SC){
		CL_BATCH_update_Purchases batch_ordenes=new CL_BATCH_update_Purchases();
		Database.executeBatch(batch_ordenes);
	}
}

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Date firstDayOfMonth = System.today().toStartOfMonth();
Date lastDayOfMonth = firstDayOfMonth.addDays(Date.daysInMonth(firstDayOfMonth.year(), firstDayOfMonth.month()) - 1);

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public Class checkRecursive
{
  private static boolean run = true;
  public static boolean runOnce(){
    if(run){
      run=false;
      return true;
    }
    else
    {

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function deleteAccent(str){ 
	for (var i=0;i<str.length;i++){ 
	//Change "á é í ó ú" 
	if (str.charAt(i)=="á") str = str.replace(/á/,"a"); 
	if (str.charAt(i)=="é") str = str.replace(/é/,"e"); 
	if (str.charAt(i)=="í") str = str.replace(/í/,"i"); 
	if (str.charAt(i)=="ó") str = str.replace(/ó/,"o"); 
	if (str.charAt(i)=="ú") str = str.replace(/ú/,"u"); 
	} 
	return str; 

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<apex:outputText value="{0, number, ###,###,###,##0.00}">
  <apex:param value="{!Opportunity.Amount}"/>
</apex:outputText>

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  CASE(MOD( StartDate__c - DATE(1985,6,24),7), 
  0 , CASE( MOD( EndDate__c - StartDate__c ,7),1,2,2,3,3,4,4,5,5,5,6,5,1), 
  1 , CASE( MOD( EndDate__c - StartDate__c ,7),1,2,2,3,3,4,4,4,5,4,6,5,1), 
  2 , CASE( MOD( EndDate__c - StartDate__c ,7),1,2,2,3,3,3,4,3,5,4,6,5,1), 
  3 , CASE( MOD( EndDate__c - StartDate__c ,7),1,2,2,2,3,2,4,3,5,4,6,5,1), 
  4 , CASE( MOD( EndDate__c - StartDate__c ,7),1,1,2,1,3,2,4,3,5,4,6,5,1), 
  5 , CASE( MOD( EndDate__c - StartDate__c ,7),1,0,2,1,3,2,4,3,5,4,6,5,0), 
  6 , CASE( MOD( EndDate__c - StartDate__c ,7),1,1,2,2,3,3,4,4,5,5,6,5,0), 
  999) 

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public class HashCodeGenerator{
 
    public static integer getHashCode(object obj){
            
        Map<string, integer> vals = new Map<string, integer>{'0' => 0, '1' => 1, '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, '8' => 8, '9' => 9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13, 'E' => 14, 'F' => 15};
        
        string objJS = JSON.serialize(obj);
        Blob b = Blob.valueOf(objJS);
        Blob bHash = Crypto.generateMac('hmacSHA1', b, blob.valueOf('a key that does not matter'));
        string objHex = EncodingUtil.convertToHex(bHash);