annotate Lib/IMPL/DOM/Navigator.pm @ 125:a4b0a819bbda

Small fixes in IMPL::DOM::Schema
author wizard
date Thu, 10 Jun 2010 17:43:51 +0400
parents a7efb3117295
children 76515373dac0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package IMPL::DOM::Navigator;
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2 use strict;
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3 use warnings;
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4
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5 use base qw(IMPL::Object);
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6 use IMPL::Class::Property;
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7 use IMPL::Class::Property::Direct;
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8 BEGIN {
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9 private _direct property _path => prop_all;
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10 private _direct property _state => prop_all;
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11 private _direct property _savedstates => prop_all;
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12 public property Current => {get => \&_getCurrent};
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13 }
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14
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15 sub CTOR {
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16 my ($this,$CurrentNode) = @_;
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17
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18 die IMPL::InvalidArgumentException("A starting node is a required paramater") unless $CurrentNode;
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19
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20 $this->{$_state} = { alternatives => [ $CurrentNode ], current => 0 };
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21 }
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22
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23 sub _initNavigator {
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24 my ($this,$CurrentNode) = @_;
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25
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26 die IMPL::InvalidArgumentException("A starting node is a required paramater") unless $CurrentNode;
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27
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28 $this->{$_state} = { alternatives => [ $CurrentNode ], current => 0 };
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29 delete $this->{$_path};
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30 delete $this->{$_savedstates};
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31 }
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32
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33 sub _getCurrent {
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34 $_[0]->{$_state}{alternatives}[$_[0]->{$_state}{current}]
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35 }
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36
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37 sub Navigate {
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38 my ($this,@path) = @_;
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39
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40 return unless @path;
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41
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42 my $node;
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43
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44 foreach my $query (@path) {
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45 if (my $current = $this->Current) {
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46
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47 my @alternatives = $current->selectNodes($query);
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48
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49 unless (@alternatives) {
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50 $current = $this->advanceNavigator or return undef;
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51 @alternatives = $current->selectNodes($query);
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52 }
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53
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54 push @{$this->{$_path}},$this->{$_state};
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55 $this->{$_state} = {
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56 alternatives => \@alternatives,
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57 current => 0,
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58 query => $query
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59 };
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60
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61 $node = $alternatives[0];
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62 } else {
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63 return undef;
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64 }
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65 }
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66
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67 $node;
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68 }
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69
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70 sub selectNodes {
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71 my ($this,@path) = @_;
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72
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73 return $this->Current->selectNodes(@path);
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74 }
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75
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76 sub internalNavigateNodeSet {
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77 my ($this,@nodeSet) = @_;
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78
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79 push @{$this->{$_path}}, $this->{$_state};
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80
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81 $this->{$_state} = {
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82 alternatives => \@nodeSet,
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83 current => 0
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84 };
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85
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86 $nodeSet[0];
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87 }
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88
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89 sub fetch {
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90 my ($this) = @_;
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91
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92 my $result = $this->Current;
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93 $this->advanceNavigator;
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94 return $result;
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95 }
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96
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97 sub advanceNavigator {
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98 my ($this) = @_;
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99
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100 $this->{$_state}{current}++;
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101
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102 if (@{$this->{$_state}{alternatives}} <= $this->{$_state}{current}) {
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103 if ( exists $this->{$_state}{query} ) {
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104 my $query = $this->{$_state}{query};
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105
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106 $this->Back or return undef; # that meams the end of the history
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107
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108 undef while ( $this->advanceNavigator and not $this->Navigate($query));
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109
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110 return $this->Current;
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111 }
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112 return undef;
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113 }
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114
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115 return $this->Current;
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116 }
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117
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118 sub doeach {
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119 my ($this,$code) = @_;
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120 local $_;
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121
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122 do {
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123 for (my $i = $this->{$_state}{current}; $i < @{$this->{$_state}{alternatives}}; $i++) {
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124 $_ = $this->{$_state}{alternatives}[$i];
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125 $code->();
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126 }
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127 $this->{$_state}{current} = @{$this->{$_state}{alternatives}};
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128 } while ($this->advanceNavigator);
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129 }
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130
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131 sub Back {
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132 my ($this,$steps) = @_;
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133 if ($this->{$_path} and @{$this->{$_path}}) {
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134 if ( (not $steps) || $steps == 1) {
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135 $this->{$_state} = pop @{$this->{$_path}};
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136 } else {
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137 $steps ||= 1;
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138
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139 $steps = @{$this->{$_path}} - 1 if $steps >= @{$this->{$_path}};
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140
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141 $this->{$_state} = (splice @{$this->{$_path}},-$steps)[0];
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142 }
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143 $this->Current if defined wantarray;
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144 } else {
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145 return undef;
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146 }
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147 }
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148
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149 sub PathToString {
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150 my ($this,$delim) = @_;
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151
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152 $delim ||= '/';
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153
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154 join($delim,map $_->{alternatives}[$_->{current}]->nodeName, $this->{$_path} ? (@{$this->{$_path}}, $this->{$_state}) : $this->{$_state});
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155 }
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156
104
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157 sub pathLength {
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158 my ($this) = @_;
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159 $this->{$_path} ? scalar @{$this->{$_path}} : 0;
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160 }
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161
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162 sub GetNodeFromHistory {
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163 my ($this,$index) = @_;
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164
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165 if (my $state = $this->{$_path} ? $this->{$_path}->[$index] : undef ) {
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166 return $state->{alternatives}[$state->{current}]
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167 } else {
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168 return undef;
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169 }
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170 }
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171
49
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172 sub clone {
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173 my ($this) = @_;
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174
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175 my $newNavi = __PACKAGE__->surrogate;
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176
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177 $newNavi->{$_path} = [ map { { %{ $_ } } } @{$this->{$_path}} ] if $this->{$_path};
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178 $newNavi->{$_state} = { %{$this->{$_state}} };
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179
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180 return $newNavi;
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181
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182 }
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183
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184 sub saveState {
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185 my ($this) = @_;
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186
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187 my %state;
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188
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189 $state{path} = [ map { { %{ $_ } } } @{$this->{$_path}} ] if $this->{$_path};
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190 $state{state} = { %{$this->{$_state}} };
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191
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192 push @{$this->{$_savedstates}}, \%state;
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193 }
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194
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195 sub restoreState {
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196 my ($this) = @_;
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197
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198 if ( my $state = pop @{$this->{$_savedstates}||[]} ) {
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199 $this->{$_path} = $state->{path};
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200 $this->{$_state} = $state->{state};
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201 }
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202 }
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203
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204 sub applyState {
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205 my ($this) = @_;
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206
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207 pop @{$this->{$_savedstates}||[]};
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208 }
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209
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210 sub dosafe {
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211 my ($this,$transaction) = @_;
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212
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213 $this->saveState();
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214
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215 my $result;
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216
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217 eval {
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218 $result = $transaction->();
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219 };
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220
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221 if ($@) {
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222 $this->restoreState();
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223 return undef;
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224 } else {
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225 $this->applyState();
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226 return $result;
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227 }
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228 }
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229
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230 1;
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231
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232 __END__
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233 =pod
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234
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235 =head1 DESCRIPTION
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236
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237 Объект для хождения по дереву DOM объектов.
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238
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239 Результатом навигации является множество узлов (альтернатив).
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240
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241 Состоянием навигатора является текущий набор узлов, позиция в данном наборе,
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242 а также запрос по которому были получены данные результаты.
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243
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244 Если при навигации указан путь сосящий из нескольких фильтров, то он разбивается
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245 этапы простой навигации по кадой из частей пути. На каждом элементарном этапе
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246 навигации образуется ряд альтернатив, и при каждом следующем этапе навигации
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247 альтернативы предыдущих этапов могут перебираться, до получения положительного
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248 результата навигации, в противном случае навигация считается невозможной.
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249
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250 =head1 METHODS
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251
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252 =over
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253
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254 =item C<<$obj->new($nodeStart)>>
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255
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256 Создает объект навигатора с указанной начальной позицией.
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257
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258 =item C<<$obj->Navigate([$query,...])>>
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259
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260 Перейти в новый узел используя запрос C<$query>. На данный момент запросом может
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261 быть только имя узла и будет взят только первый узел. Если по запросу ничего не
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262 найдено, переход не будет осуществлен.
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263
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264 Возвращает либо новый узел в который перешли, либо C<undef>.
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265
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266 =item C<<$obj->Back()>>
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267
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268 Возвращается в предыдущий узел, если таковой есть.
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269
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270 Возвращает либо узел в который перешли, либо C<undef>.
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271
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272 =item C<<$obj->advanceNavigator()>>
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273
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274 Переходит в следующую альтернативу, соответствующую текущему запросу.
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275
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276 =back
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277
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278 =cut