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package WebService::Cmis::AtomFeed; |
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=head1 NAME |
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WebService::Cmis::AtomFeed - Representation of an Atom feed. |
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=head1 DESCRIPTION |
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This class is subclassed to further specify the type of entries in this collection. |
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Sub-classes: |
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=over 4 |
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=item * L |
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=item * L |
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=item * L |
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=back |
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Sub-classes must implement to specify how to instantiate objects of this feed. |
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=cut |
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use strict; |
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use warnings; |
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use WebService::Cmis qw(:namespaces :relations :utils); |
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use XML::LibXML (); |
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our $CMIS_XPATH_ENTRY = new XML::LibXML::XPathExpression('./*[local-name() = "entry"]'); |
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our $CMIS_XPATH_TITLE = new XML::LibXML::XPathExpression('./*[local-name() = "title" and namespace-uri() ="'.ATOM_NS.'"]'); |
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our $CMIS_XPATH_UPDATED = new XML::LibXML::XPathExpression('./*[local-name() = "updated" and namespace-uri() ="'.ATOM_NS.'"]'); |
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our $CMIS_XPATH_GENERATOR = new XML::LibXML::XPathExpression('./*[local-name() = "generator" and namespace-uri() ="'.ATOM_NS.'"]'); |
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our $CMIS_XPATH_NUMITEMS = new XML::LibXML::XPathExpression('./*[local-name() = "numItems" and namespace-uri() ="'.CMISRA_NS.'"]'); |
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our $CMIS_XPATH_PAGESIZE = new XML::LibXML::XPathExpression('./*[local-name() = "itemsPerPage" and namespace-uri() ="'.OPENSEARCH_NS.'"]'); |
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our $CMIS_XPATH_TOTALRESULTS = new XML::LibXML::XPathExpression('./*[local-name() = "totalResults" and namespace-uri() ="'.OPENSEARCH_NS.'"]'); |
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=head1 METHODS |
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=over 4 |
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=item new(%params) |
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Create a new WebService::Cmis::AtomFeed object. |
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=cut |
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sub new { |
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my $class = shift; |
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my $this = bless({@_ }, $class); |
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throw Error::Simple("no xmlDoc in constructor") unless defined $this->{xmlDoc}; |
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$this->_initData; |
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return $this; |
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} |
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sub _initData { |
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my $this = shift; |
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$this->{index} = 0; |
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$this->{entries} = undef; |
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$this->{title} = undef; |
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$this->{updated} = undef; |
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$this->{generator} = undef; |
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$this->{totalResults} = undef; |
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$this->{pageSize} = undef; |
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} |
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sub DESTROY { |
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my $this = shift; |
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$this->_initData; |
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$this->{repository} = undef; |
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$this->{xmlDoc} = undef; |
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} |
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=item getLink($relation) -> $href |
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returns the link found in the feed's XML for the specified relation |
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=cut |
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sub getLink { |
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my ($this, $relation) = @_; |
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my ($linkNode) = $this->{xmlDoc}->documentElement->findnodes('./*[local-name() = "link" and @rel="'.$relation.'"][1]/@href'); |
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return $linkNode->value if $linkNode; |
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} |
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# given a specified $relation, does a get using that link (if one exists) |
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# and then converts the resulting XML into a list of |
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# AtomEntry objects or its appropriate sub-type. |
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# The results are kept around to facilitate repeated calls without moving |
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# the cursor. |
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sub _getPage { |
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my ($this, $relation) = @_; |
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my $link = $this->getLink($relation); |
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return unless $link; |
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#print STDERR "getPage($link)\n"; |
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$this->{xmlDoc} = $this->{repository}{client}->get($link); |
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$this->{entries} = undef; |
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$this->{index} = 0; |
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return $this->_getPageEntries; |
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} |
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# returns a list of all AtomEntries on the current page |
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sub _getPageEntries { |
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my $this = shift; |
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unless (defined $this->{entries}) { |
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my @entries = $this->{xmlDoc}->documentElement->findnodes($CMIS_XPATH_ENTRY); |
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$this->{entries} = \@entries; |
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} |
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return $this->{entries}; |
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} |
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=item newEntry($xmlDoc) -> $atomEntry |
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creates an item from an xml fragment part of this atom feed. this virtual method |
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must be implemented by subclasses of AtomFeed. |
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name to be used for all entries |
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135
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=cut |
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137
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sub newEntry { |
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throw Error::Simple("virtual method not implemented"); |
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} |
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141
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=item getNext -> $nextAtomEntry |
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143
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returns the next AtomEnrty in this feed |
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or undef if we hit the end of the list |
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146
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=cut |
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148
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sub getNext { |
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my $this = shift; |
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151
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my $nrEntries = scalar(@{$this->_getPageEntries}); |
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153
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if ($this->{index} >= $nrEntries) { |
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#my $link = $this->getLink(NEXT_REL); |
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#print STDERR "fetching next page from $link\n"; |
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return unless $this->_getPage(NEXT_REL); |
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} else { |
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#print STDERR "using current page\n"; |
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} |
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161
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my $result = $this->{entries}->[$this->{index}]; |
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return unless $result; |
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164
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$this->{index}++; |
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166
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#print STDERR "newEntry ($this)\n"; |
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return $this->newEntry($result); |
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} |
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170
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=item getPrev -> $prevAtomEntry |
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172
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returns the previous AtomEnrty in this feed |
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or undef if we hit the beginning of the list |
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175
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=cut |
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177
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sub getPrev { |
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my $this = shift; |
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180
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$this->{index}--; |
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182
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if ($this->{index} < 0) { |
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return unless $this->_getPage(PREV_REL); |
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185
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my $nrEntries = scalar(@{$this->_getPageEntries}); |
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return unless $nrEntries; |
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188
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$this->{index} = $nrEntries-1; |
189
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} |
190
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191
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my $result = $this->_getPageEntries->[$this->{index}]; |
192
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return unless $result; |
193
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194
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return $this->newEntry($result); |
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} |
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197
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=item getFirst -> $firstAtomEntry |
198
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199
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returns the first AtomEntry of the feed. |
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201
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=cut |
202
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203
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sub getFirst { |
204
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my $this = shift; |
205
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206
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$this->rewind; |
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return $this->newEntry($this->_getPageEntries->[$this->{index}]); |
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} |
209
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210
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=item getLast -> $lastAtomEntry |
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212
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returns the last AtomEntry of the feed. |
213
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214
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=cut |
215
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216
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sub getLast { |
217
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my $this = shift; |
218
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219
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$this->fastforward; |
220
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$this->{index}--; |
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return $this->newEntry($this->_getPageEntries->[$this->{index}]); |
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} |
223
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224
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=item fastforward |
225
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226
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fetches the last page of the feed and sets the index to the last entry on that |
227
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page. This is the kind of oposite of rewind(). This only works if the |
228
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repository returns a "last" link. |
229
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230
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=cut |
231
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232
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sub fastforward { |
233
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my $this = shift; |
234
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235
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$this->_getPage(LAST_REL); |
236
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$this->{index} = scalar(@{$this->_getPageEntries}); |
237
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} |
238
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239
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=item rewind |
240
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241
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fetches the first page of the feed again and resets the counter |
242
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so that the next call to getNext() will return the first AtomEntry |
243
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in the feed again |
244
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245
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=cut |
246
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247
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sub rewind { |
248
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my $this = shift; |
249
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250
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$this->_getPage(FIRST_REL); |
251
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$this->{index} = 0; |
252
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} |
253
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254
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=item getTitle -> $title |
255
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256
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getter for the object's atom:title property. |
257
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258
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=cut |
259
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260
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sub getTitle { |
261
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my $this = shift; |
262
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263
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unless (defined $this->{title}) { |
264
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$this->{title} = $this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_TITLE); |
265
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} |
266
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267
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return $this->{title}; |
268
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} |
269
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270
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=item getUpdated -> $epoch |
271
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272
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getter for the object's atom:updated property. |
273
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274
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=cut |
275
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276
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sub getUpdated { |
277
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my $this = shift; |
278
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279
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unless (defined $this->{updated}) { |
280
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require WebService::Cmis::Property; |
281
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$this->{updated} = WebService::Cmis::Property::parseDateTime($this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_UPDATED)); |
282
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} |
283
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284
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return $this->{updated}; |
285
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} |
286
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287
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|
=item getGenerator -> $string |
288
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289
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getter for the object's atom:generator property. |
290
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291
|
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|
=cut |
292
|
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293
|
|
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|
sub getGenerator { |
294
|
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|
my $this = shift; |
295
|
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296
|
|
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|
|
unless (defined $this->{generator}) { |
297
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|
|
$this->{generator} = $this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_GENERATOR); |
298
|
|
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|
|
} |
299
|
|
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|
|
300
|
|
|
|
|
|
|
return $this->{generator}; |
301
|
|
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|
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|
|
} |
302
|
|
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|
|
303
|
|
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|
|
304
|
|
|
|
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|
|
=item getSize -> $integer |
305
|
|
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|
|
|
|
|
306
|
|
|
|
|
|
|
get the total number of items in the result set. it first tries to read the cmisra:numItems property. |
307
|
|
|
|
|
|
|
if that's not present the opensearch:totalResults elemt is checked |
308
|
|
|
|
|
|
|
|
309
|
|
|
|
|
|
|
=cut |
310
|
|
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|
|
|
|
|
311
|
|
|
|
|
|
|
sub getSize { |
312
|
|
|
|
|
|
|
my $this = shift; |
313
|
|
|
|
|
|
|
|
314
|
|
|
|
|
|
|
unless (defined $this->{totalResults}) { |
315
|
|
|
|
|
|
|
$this->{totalResults} = |
316
|
|
|
|
|
|
|
$this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_TOTALRESULTS) || |
317
|
|
|
|
|
|
|
$this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_NUMITEMS) || |
318
|
|
|
|
|
|
|
scalar(@{$this->_getPageEntries}); |
319
|
|
|
|
|
|
|
} |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
return $this->{totalResults}; |
322
|
|
|
|
|
|
|
} |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
=item getPageSize -> $integer |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
returns the size of a page in the result set. this should equal the maxItem value if set in a query |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
=cut |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
sub getPageSize { |
331
|
|
|
|
|
|
|
my $this = shift; |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
unless (defined $this->{pageSize}) { |
334
|
|
|
|
|
|
|
$this->{pageSize} = |
335
|
|
|
|
|
|
|
$this->{xmlDoc}->documentElement->findvalue($CMIS_XPATH_PAGESIZE) || |
336
|
|
|
|
|
|
|
scalar(@{$this->_getPageEntries}); |
337
|
|
|
|
|
|
|
} |
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
return $this->{pageSize}; |
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
=item toString() |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
return a string representation of this object |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
=cut |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
sub toString { |
350
|
|
|
|
|
|
|
my $this = shift; |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
my @result = (); |
353
|
|
|
|
|
|
|
foreach my $elem (@{$this->_getPageEntries}) { |
354
|
|
|
|
|
|
|
my $id = $elem->findvalue('./cmisra:object/cmis:properties/cmis:propertyId[@propertyDefinitionId="cmis:objectId"]'); |
355
|
|
|
|
|
|
|
next unless $id; |
356
|
|
|
|
|
|
|
my $name = $elem->findvalue('./cmisra:object/cmis:properties/cmis:propertyString[@propertyDefinitionId="cmis:name"]'); |
357
|
|
|
|
|
|
|
push @result, "$id ($name)"; |
358
|
|
|
|
|
|
|
} |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
return $this->getTitle.': '.join(", ", @result); |
361
|
|
|
|
|
|
|
} |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
=back |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
Copyright 2012-2013 Michael Daum |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
This module is free software; you can redistribute it and/or modify it under |
371
|
|
|
|
|
|
|
the same terms as Perl itself. See F. |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
=cut |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
1; |