src/org/mxchange/jcustomercore/utils/Customers.java

   1 /*
   2  * Copyright (C) 2016 - 2018 Free Software Foundation
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.jcustomercore.utils;
  18
  19 import java.security.SecureRandom;
  20 import java.text.MessageFormat;
  21 import java.util.Objects;
  22 import java.util.Random;
  23 import org.apache.commons.lang3.StringUtils;
  24 import org.mxchange.jcustomercore.model.customer.Customer;
  25
  26 /**
  27  * Customer utilities
  28  * <p>
  29  * @author Roland Häder<roland@mxchange.org>
  30  */
  31 public class Customers {
  32
  33         /**
  34          * Random number generator
  35          */
  36         private static final Random RANDOM_NUMBER_GENERATOR;
  37
  38         /**
  39          * Static initializer
  40          */
  41         static {
  42                 // Init RNG
  43                 RANDOM_NUMBER_GENERATOR = new SecureRandom();
  44         }
  45
  46         /**
  47          * Compares both customer instances. This method returns -1 if second
  48          * instance is null.
  49          * <p>
  50          * @param customer1 Customer instance 1
  51          * @param customer2 Customer instance 2
  52          * <p>
  53          * @return Comparison value
  54          */
  55         public static int compare (final Customer customer1, final Customer customer2) {
  56                 // Check euqality, then at least first must be given
  57                 if (Objects.equals(customer1, customer2)) {
  58                         // Both are same
  59                         return 0;
  60                 } else if (null == customer1) {
  61                         // First is null
  62                         return -1;
  63                 } else if (null == customer2) {
  64                         // Second is null
  65                         return 1;
  66                 }
  67
  68                 // Invoke compareTo() method
  69                 return customer1.compareTo(customer2);
  70         }
  71
  72         /**
  73          * Copies all fields from source customer to target customer instance.
  74          * <p>
  75          * @param targetCustomer Target customer instance 1
  76          * @param sourceCustomer Source customer instance 2
  77          * <p>
  78          * @throws NullPointerException If one parameter is null
  79          */
  80         public static void copyAll (final Customer targetCustomer, final Customer sourceCustomer) {
  81                 // Check both parameter
  82                 if (null == targetCustomer) {
  83                         // Throw NPE
  84                         throw new NullPointerException("targetCustomer is null"); //NOI18N
  85                 } else if (null == sourceCustomer) {
  86                         // Throw NPE
  87                         throw new NullPointerException("sourceCustomer is null"); //NOI18N
  88                 }
  89
  90                 // Copy all fields
  91                 targetCustomer.setCustomerAccountStatus(sourceCustomer.getCustomerAccountStatus());
  92                 targetCustomer.setCustomerContact(sourceCustomer.getCustomerContact());
  93                 targetCustomer.setCustomerCreated(sourceCustomer.getCustomerCreated());
  94                 targetCustomer.setCustomerId(sourceCustomer.getCustomerId());
  95                 targetCustomer.setCustomerLastLocked(sourceCustomer.getCustomerLastLocked());
  96                 targetCustomer.setCustomerLastLockedReason(sourceCustomer.getCustomerLastLockedReason());
  97                 targetCustomer.setCustomerNumber(sourceCustomer.getCustomerNumber());
  98         }
  99
 100         /**
 101          * Generates a random customer number with some dashes in it
 102          * <p>
 103          * @param totalLength Length of the number
 104          * @param blockSize   Block size
 105          * @param separator   Separator
 106          * <p>
 107          * @return Generated customer number
 108          */
 109         public static String generateCustomerNumber (final int totalLength, final short blockSize, final char separator) {
 110                 // All parameters must be set
 111                 if (totalLength < 5) {
 112                         // Total length is to short
 113                         throw new IllegalArgumentException(MessageFormat.format("Total length of{0} characters is to short (5 minimum)", totalLength)); //NOI18N
 114                 } else if (blockSize < 3) {
 115                         // 3 charcters is minimum
 116                         throw new IllegalArgumentException(MessageFormat.format("Block size of {0} characters is to short (3 minimum)", blockSize)); //NOI18N
 117                 }
 118
 119                 // Init number
 120                 StringBuilder customerNumber = new StringBuilder(totalLength);
 121
 122                 // Calculate total blockas
 123                 long totalBlocks = Math.round(totalLength / (blockSize - 1) - 0.5) - 1;
 124
 125                 // Generate customer number
 126                 for (int i = 0; i < totalBlocks; i++) {
 127                         // Fill it up with leading zeros and append it + separator character
 128                         customerNumber.append(genrateBlock(blockSize)).append(separator);
 129                 }
 130
 131                 // Calculate remaining charcters
 132                 long remain = totalLength - (blockSize + 1) * totalBlocks;
 133
 134                 // Generate new block and append it
 135                 customerNumber.append(genrateBlock((short) remain));
 136
 137                 // Return finished number
 138                 return customerNumber.toString();
 139         }
 140
 141         /**
 142          * Generates a block of numbers with leading zeros, if the random number is
 143          * shorter than block size
 144          * <p>
 145          * @param blockSize Block size
 146          * <p>
 147          * @return Generated block
 148          */
 149         private static String genrateBlock (final short blockSize) {
 150                 // Generate random number
 151                 int num = RANDOM_NUMBER_GENERATOR.nextInt((int) Math.pow(10, blockSize));
 152
 153                 // Generate "block" and return it
 154                 return StringUtils.leftPad(String.valueOf(num), blockSize, '0');
 155         }
 156
 157         /**
 158          * No constructors for utility classes
 159          */
 160         private Customers () {
 161         }
 162
 163 }