Functions/Class_LCCNBook.ps1
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class LCCNBook { # Properties [string] $LCCN = '' [string] $LCCNReformatted = '' [string] $LibraryOfCongressNumber = '' [string] $Title = '' [string] $Author = '' [string] $PublisherLocation = '' [string] $Publishers = '' [string] $PublishDate = '' [string] $Subject = '' [string] $LibraryOfCongressClassification = '' [string] $Description = '' [string] $Edition = '' # Default Constructor ISBNBook() { } [string] GetLCCNBookData($LCCN) { # retMsg = Return Message $retMsg = "Beginning GetLCCNBookData for $LCCN at $(Get-Date).ToString('yyyy-MM-dd hh:mm:ss tt')" # First we need to remove any non digits. Then pad the ending to six digits $lccnCleaned = $LCCN.Replace('-', '').Replace(' ', '') $lccnPrefix = $lccnCleaned.Substring(0,2) $lccnPadded = $lccnCleaned.Substring(2).PadLeft(6, '0') # Now combine the reformatted LCCN and save it as a property $lccnFormatted ="$($lccnPrefix)$($lccnPadded)" $this.LCCNReformatted = $lccnFormatted # Create the URL $baseURL = "http://lx2.loc.gov:210/lcdb?version=3&operation=searchRetrieve&query=bath.lccn=" $urlParams = "&maximumRecords=1&recordSchema=mods" $url = "$($baseURL)$($lccnFormatted)$($urlParams)" # Set the LCCN property to what was passed in $this.LCCN = $LCCN # Try to get the ISBN data from the OpenLibrary website try { $bookData = Invoke-RestMethod $url $retMsg = "Retrieved LCCN $LCCN from Library of Congress" } catch { $this.LibraryOfCongressNumber = '0' $this.Title = "Failed to retrieve LCCN $LCCN. Possible internect connection issue." $retMsg = "Failed to retrieve LCCN $LCCN. Possible internect connection issue." return $retMsg } # Error handler for books not found if ($null -eq $bookData.searchRetrieveResponse.records.record.recordData.mods.titleInfo.title) { $this.LibraryOfCongressNumber = '0' $this.Title = "Failed to retrieve LCCN $LCCN. Possible internect connection issue." $retMsg = "Failed to retrieve LCCN $LCCN. Possible internect connection issue." } else # The book was found, assign the data { $this.LibraryOfCongressNumber = $bookData.searchRetrieveResponse.records.record.recordData.mods.identifier.'#text' $this.Title = $bookData.searchRetrieveResponse.records.record.recordData.mods.titleInfo.title $this.PublishDate = $bookData.searchRetrieveResponse.records.record.recordData.mods.originInfo.dateIssued.'#text' $this.LibraryOfCongressClassification = $bookData.searchRetrieveResponse.records.record.recordData.mods.classification.'#text' $this.Description = $bookData.searchRetrieveResponse.records.record.recordData.mods.physicalDescription.extent $this.Edition = $bookData.searchRetrieveResponse.records.record.recordData.mods.originInfo.edition # Books can have multiple authors, each is returned in its own item in an array. # Combine them into a single string. $authors = [System.Text.StringBuilder]::new() foreach ($a in $bookData.searchRetrieveResponse.records.record.recordData.mods.name) { if ($authors.Length -gt 1) { [void]$authors.Append(", $($a.namePart)") } else { [void]$authors.Append($a.namePart) } } $this.Author = $authors.ToString() # Subjects can be an array, combine into a single string $subjects = [System.Text.StringBuilder]::new() $topics = $bookData.searchRetrieveResponse.records.record.recordData.mods.subject | Select topic foreach ($s in $topics.topic) { if ($subjects.Length -gt 1) { [void]$subjects.Append(", $($s)") } else { [void]$subjects.Append($s) } } $this.Subject = $subjects.ToString() # A book could have multiple publishers over time. The author could shift to # a new publisher, or more likely a publishing house could be purchases and # the new owners name used. The data is returned as an array, so combine # them as we did with authors and subjects $thePublishers = [System.Text.StringBuilder]::new() foreach ($p in $bookData.searchRetrieveResponse.records.record.recordData.mods.originInfo.agent) { if ($thePublishers.Length -gt 1) { [void]$thePublishers.Append(", $($p.namePart)") } else { [void]$thePublishers.Append($p.namePart) } } $this.Publishers = $thePublishers.ToString() # Since there could be multiple publishers, logically there could be multiple # publishing locations. Combine them. $locations = [System.Text.StringBuilder]::new() foreach ($l in $bookData.searchRetrieveResponse.records.record.recordData.mods.originInfo.place.placeTerm) { if ($locations.Length -gt 1) { [void]$locations.Append(", $($l.'#text')") } else { [void]$locations.Append($l.'#text') } } $this.PublisherLocation = $locations.ToString() # All done! Set a success message. $retMsg = "Successfully retrieved data for LCCN $LCCN" } return $retMsg } } |