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1 package ObjectProperty;
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2 #
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3 # $RCSfile: ObjectProperty.pm,v $
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4 # $Date: 2015/02/28 20:47:18 $
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5 # $Revision: 1.25 $
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6 #
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7 # Author: Manish Sud <msud@san.rr.com>
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8 #
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9 # Copyright (C) 2015 Manish Sud. All rights reserved.
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10 #
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11 # This file is part of MayaChemTools.
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12 #
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13 # MayaChemTools is free software; you can redistribute it and/or modify it under
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14 # the terms of the GNU Lesser General Public License as published by the Free
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15 # Software Foundation; either version 3 of the License, or (at your option) any
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16 # later version.
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17 #
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18 # MayaChemTools is distributed in the hope that it will be useful, but without
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19 # any warranty; without even the implied warranty of merchantability of fitness
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20 # for a particular purpose. See the GNU Lesser General Public License for more
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21 # details.
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22 #
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23 # You should have received a copy of the GNU Lesser General Public License
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24 # along with MayaChemTools; if not, see <http://www.gnu.org/licenses/> or
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25 # write to the Free Software Foundation Inc., 59 Temple Place, Suite 330,
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26 # Boston, MA, 02111-1307, USA.
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27 #
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28
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29 use strict;
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30 use Carp;
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31
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32 use vars qw($AUTOLOAD);
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33
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34 # Set property for an object...
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35 sub SetProperty {
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36 my($This, $Name, $Value) = @_;
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37
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38 if (!(defined($Name) && defined($Value))) {
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39 return undef;
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40 }
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41 return $This->_SetProperty($Name, $Value);
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42 }
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43
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44 # Set properties for an object...
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45 sub SetProperties {
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46 my($This, %NamesAndValues) = @_;
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47 my($Name, $Value);
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48
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49 while (($Name, $Value) = each %NamesAndValues) {
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50 $This->_SetProperty($Name, $Value);
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51 }
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52
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53 return $This;
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54 }
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55
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56 # Set object property...
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57 sub _SetProperty {
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58 my($This, $Name, $Value) = @_;
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59
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60 $This->{$Name} = $Value;
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61 }
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62
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63 # Get property for an object...
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64 sub GetProperty {
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65 my($This, $Name) = @_;
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66
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67 if (!defined $Name) {
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68 return undef;
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69 }
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70 return $This->_GetProperty($Name);
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71 }
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72
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73 # Get object property...
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74 sub _GetProperty {
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75 my($This, $Name) = @_;
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76
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77 if (exists $This->{$Name}) {
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78 return $This->{$Name};
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79 }
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80 else {
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81 return undef;
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82 }
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83 }
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84
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85 # Does this property exist?
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86 sub HasProperty {
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87 my($This, $Name) = @_;
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88
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89 if (!defined $Name) {
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90 return 0;
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91 }
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92 return (exists $This->{$Name}) ? 1 : 0;
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93 }
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94
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95 # Delete object property...
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96 sub DeleteProperty {
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97 my($This, $Name) = @_;
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98
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99 if (!defined $Name) {
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100 return undef;
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101 }
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102 return $This->_DeleteProperty($Name);
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103 }
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104
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105 # Delete object property...
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106 sub _DeleteProperty {
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107 my($This, $Name) = @_;
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108
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109 if (exists $This->{$Name}) {
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110 delete $This->{$Name};
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111 }
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112 return $This;
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113 }
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114
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115 # Implements Set<PropertyName> and Get<PropertyName> methods...
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116 sub AUTOLOAD {
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117 my($This, $PropertyValue) = @_;
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118 my($PackageName, $MethodName, $PropertyName, $ThisType);
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119
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120 # Do a greedy match to make sure package name and method names are
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121 # picked up correctly from invocation names containing multiple occurences
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122 # of ::. For example: FileIO::SDFileIO::GetFileHandle and so on.
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123 #
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124 ($PackageName, $MethodName) = $AUTOLOAD =~ /^(.*)::(.*)$/;
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125
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126 if ($MethodName =~ /^(BEGIN|DESTROY)$/) {
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127 return;
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128 }
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129
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130 $ThisType = ref($This) or croak "Error: Invocation of function ${PackageName}::${MethodName} invocation is not supported: It must be invoked using an object reference...";
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131
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132 if (!($MethodName =~ /^Get/ || $MethodName =~ /^Set/ || $MethodName =~ /^Delete/)) {
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133 croak "Error: Can't locate object method \"$MethodName\" via package \"$ThisType\": This method is not automatically implemented by AUTOLOAD: Only Get<PropertyName>, Set<PropertyName> and Delete<PropertyName> functions are implemented via AUTOLOAD...";
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134 }
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135 if ($MethodName =~ /^Delete/) {
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136 ($PropertyName) = $MethodName =~ /^Delete(.*?)$/;
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137 }
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138 else {
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139 ($PropertyName) = $MethodName =~ /^[SG]et(.*?)$/;
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140 }
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141 if ($MethodName =~ /^Set/ && !defined($PropertyValue)) {
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142 carp "Warning: ${PackageName}::${MethodName}: Didn't set value for property $PropertyName: Property value for must be specified...\n";
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143 return undef;
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144 }
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145
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146 if ($MethodName =~ /^Get/) {
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147 return $This->_GetProperty($PropertyName);
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148 }
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149 elsif ($MethodName =~ /^Set/) {
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150 return $This->_SetProperty($PropertyName, $PropertyValue);
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151 }
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152 elsif ($MethodName =~ /^Delete/) {
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153 return $This->_DeleteProperty($PropertyName);
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154 }
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155
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156 }
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157
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158 1;
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159
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160 __END__
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161
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162 =head1 NAME
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163
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164 ObjectProperty
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165
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166 =head1 SYNOPSIS
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167
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168 use ObjectProperty;
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169
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170 =head1 DESCRIPTION
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171
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172 B<ObjectProperty> is an abstract base class which implements methods not explicitly defined
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173 in classed derived from this class using Perl's AUTOLOAD functionality. These methods are generated
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174 on-the-fly for a specified object property:
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175
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176 Set<PropertyName>(<PropertyValue>);
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177 $PropertyValue = Get<PropertyName>();
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178 Delete<PropertyName>();
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179
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180 This class uses its parent class hash to set, get, and delete propery names and values.
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181
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182 ObjectProperty module provides the following methods to be used in context of its parent class:
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183
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184 DeleteProperty, GetProperty, HasProperty, SetProperties, SetProperty
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185
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186 =head2 METHODS
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187
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188 =over 4
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189
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190 =item B<DeleteProperty>
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191
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192 DeleteProperty($Name);
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193
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194 Deletes specified property I<Name>
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195
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196 =item B<GetProperty>
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197
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198 GetProperty($Name);
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199
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200 Returns value associated with specified property I<Name>.
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201
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202 =item B<HasProperty>
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203
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204 HasProperty($Name);
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205
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206 Returns 1 or 0 based on whether specified property I<Name> associated with an object.
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207
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208 =item B<SetProperties>
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209
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210 SetProperties(%NamesAndValues);
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211
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212 Using specified property name and value hash I<NamesAndValues>, associates each
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213 property I<Name> and I<Values> to an object.
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214
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215 =item B<SetProperty>
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216
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217 SetProperty($Name, $Value);
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218
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219 Associate property I<Name> and I<Value> to an object.
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220
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221 =back
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222
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223 =head1 AUTHOR
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224
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225 Manish Sud <msud@san.rr.com>
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226
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227 =head1 COPYRIGHT
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228
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229 Copyright (C) 2015 Manish Sud. All rights reserved.
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230
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231 This file is part of MayaChemTools.
|
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232
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233 MayaChemTools is free software; you can redistribute it and/or modify it under
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234 the terms of the GNU Lesser General Public License as published by the Free
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235 Software Foundation; either version 3 of the License, or (at your option)
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236 any later version.
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237
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238 =cut
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