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1 package FileIO::FileIO;
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2 #
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3 # $RCSfile: FileIO.pm,v $
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4 # $Date: 2015/02/28 20:48:43 $
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5 # $Revision: 1.27 $
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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 use Exporter;
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32 use FileHandle;
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33 use ObjectProperty;
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34
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35 use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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36
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37 @ISA = qw(ObjectProperty Exporter);
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38 @EXPORT = qw();
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39 @EXPORT_OK = qw();
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40
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41 %EXPORT_TAGS = (all => [@EXPORT, @EXPORT_OK]);
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42
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43 # Setup class variables...
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44 my($ClassName);
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45 _InitializeClass();
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46
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47 # Class constructor...
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48 sub new {
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49 my($Class, %NamesAndValues) = @_;
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50
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51 # Initialize object...
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52 my $This = {};
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53 bless $This, ref($Class) || $Class;
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54 $This->_InitializeFileIO();
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55
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56 $This->_InitializeFileIOProperties(%NamesAndValues);
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57
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58 return $This;
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59 }
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60
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61 # Initialize object data...
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62 #
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63 sub _InitializeFileIO {
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64 my($This) = @_;
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65
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66 # File name...
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67 $This->{Name} = '';
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68
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69 # Read, write or append...
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70 $This->{Mode} = 'Read';
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71
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72 # Open/close status...
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73 $This->{Status} = 0;
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74
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75 # File handle returned by file open...
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76 $This->{FileHandle} = '';
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77 }
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78
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79 # Initialize class ...
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80 sub _InitializeClass {
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81 #Class name...
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82 $ClassName = __PACKAGE__;
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83
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84 }
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85
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86 # Initialize object properties....
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87 sub _InitializeFileIOProperties {
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88 my($This, %NamesAndValues) = @_;
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89
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90 my($Name, $Value, $MethodName);
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91 while (($Name, $Value) = each %NamesAndValues) {
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92 $MethodName = "Set${Name}";
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93 $This->$MethodName($Value);
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94 }
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95
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96 return $This;
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97 }
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98
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99 # Close any open file...
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100 sub DESTROY {
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101 my($This) = @_;
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102
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103 $This->Close();
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104
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105 return $This;
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106 }
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107
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108 # Set file name and make sure it's not already set...
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109 #
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110 sub SetName {
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111 my($This, $Name) = @_;
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112
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113 if ($This->{Name}) {
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114 croak "Error: ${ClassName}->SetName: Can't set file name to $Name: $This->{Name}...";
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115 }
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116
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117 $This->{Name} = $Name;
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118
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119 return $This;
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120 }
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121
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122 # Open file using specified mode...
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123 #
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124 sub Open {
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125 my($This, $Mode) = @_;
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126
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127 if ($This->{Status}) {
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128 croak "Error: ${ClassName}->Open: Can't open file $This->{Name}: It's already open...";
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129 }
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130
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131 if (defined $Mode) {
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132 # Set mode...
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133 $This->SetMode($Mode);
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134 }
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135
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136 # Get name and mode...
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137 my($Name);
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138 $Name = $This->{Name};
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139 $Mode = $This->_GetOpenMode();
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140
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141 # Open the file using specified mode and store FileHandle...
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142 my($FileHandle);
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143 $FileHandle = new FileHandle("${Mode}${Name}");
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144 if (!defined $FileHandle) {
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145 croak "Error: ${ClassName}->Open: Can't open $Name: $! ...";
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146 }
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147 $This->{FileHandle} = $FileHandle;
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148 $This->{Status} = 1;
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149
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150 return $This;
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151 }
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152
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153 # Close an open file...
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154 sub Close {
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155 my($This) = @_;
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156
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157 if ($This->{Status}) {
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158 $This->{FileHandle}->close();
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159 }
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160 $This->{Status} = 0;
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161
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162 return $This;
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163 }
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164
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165 # Supported Mode values are: Read, Write, Append, <, >, >>, r, w, a
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166 #
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167 sub SetMode {
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168 my($This, $SpecifiedMode) = @_;
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169 my($Mode);
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170
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171 if (!defined $SpecifiedMode) {
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172 $SpecifiedMode = 'Read';
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173 }
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174
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175 MODE: {
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176 if ($SpecifiedMode =~ /^(Read|<|r)$/i) { $Mode = 'Read'; last MODE; }
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177 if ($SpecifiedMode =~ /^(Write|>|w)$/i) { $Mode = 'Write'; last MODE; }
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178 if ($SpecifiedMode =~ /^(Append|>>|a)$/i) { $Mode = 'Append'; last MODE; }
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179 croak "Error: ${ClassName}->SetMode: Specified mode value, $SpecifiedMode, is not valid: Supported values: Read, Write, Append, <, >, >>, r, w, a...";
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180 }
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181 $This->{Mode} = $Mode;
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182
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183 return $This;
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184 }
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185
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186 # Get mode values to be used for file open function: <, >, >>
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187 #
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188 sub _GetOpenMode {
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189 my($This) = @_;
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190 my($Mode);
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191
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192 MODE: {
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193 if ($This->{Mode} =~ /^(Read|<|r)$/i) { $Mode = '<'; last MODE; }
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194 if ($This->{Mode} =~ /^(Write|>|w)$/i) { $Mode = '>'; last MODE; }
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195 if ($This->{Mode} =~ /^(Append|>>|a)$/i) { $Mode = '>>'; last MODE; }
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196 $Mode = '';
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197 }
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198 return $Mode;
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199 }
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200
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201 1;
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202
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203 __END__
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204
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205 =head1 NAME
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206
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207 FileIO
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208
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209 =head1 SYNOPSIS
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210
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211 use FileIO::FileIO;
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212
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213 use FileIO::FileIO qw(:all);
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214
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215 =head1 DESCRIPTION
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216
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217 B<FIleIO> class provides following methods:
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218
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219 new, Close, Open, SetMode
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220
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221 B<FleIO> class serves as a base class for all classes involved in file IO. It is derived from
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222 B<ObjectProperty> base class which provides methods not explicitly defined in B<Atom> or
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223 B<ObjectProperty> class using Perl's AUTOLOAD functionality. These methods
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224 are generated on-the-fly for a specified object property:
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225
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226 Set<PropertyName>(<PropertyValue>);
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227 $PropertyValue = Get<PropertyName>();
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228 Delete<PropertyName>();
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229
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230 =head2 METHODS
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231
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232 =over 4
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233
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234 =item B<new>
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235
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236 $NewFileIO = new FileIO(%NamesAndValues);
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237
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238 Using specified I<FileIO> property names and values hash, B<new> method creates a new object
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239 and returns a reference to a newly created B<FileIO> object. By default, the following properties are
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240 initialized:
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241
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242 Name = '';
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243 Mode = 'Read';
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244 Status = 0;
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245 FileHandle = '';
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246
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247 =item B<Close>
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248
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249 $FileIO->Close();
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250
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251 Close open file and returns I<FileIO>.
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252
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253 =item B<Open>
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254
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255 $FileIO->Open();
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256
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257 Opens the file using file I<Name> and I<Mode> and returns I<FileIO>.
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258
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259 =item B<SetMode>
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260
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261 $FileIO->SetMode($Mode);
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262
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263 Sets up file I<Mode> and returns I<FileIO> Default I<Mode> value: I<Read>.
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264 Supported I<Mode> values:
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265
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266 Read, Write, Append, <, >, >>, r, w, a
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267
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268 =item B<SetName>
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269
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270 $FileIO->SetName($Name);
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271
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272 Sets up file I<Name> and returns I<FileIO>.
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273
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274 =back
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275
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276 =head1 AUTHOR
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277
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278 Manish Sud <msud@san.rr.com>
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279
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280 =head1 SEE ALSO
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281
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282 MoleculeFileIO.pm, MDLMolFileIO.pm, SDFileIO.pm
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283
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284 =head1 COPYRIGHT
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285
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286 Copyright (C) 2015 Manish Sud. All rights reserved.
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287
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288 This file is part of MayaChemTools.
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289
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290 MayaChemTools is free software; you can redistribute it and/or modify it under
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291 the terms of the GNU Lesser General Public License as published by the Free
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292 Software Foundation; either version 3 of the License, or (at your option)
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293 any later version.
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294
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295 =cut
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