Functions/Class_ISBNBook.ps1
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class ISBNBook { # Properties [string] $ISBN = '' [string] $ISBN10 = '' [string] $ISBN13 = '' [string] $Title = '' [string] $LCCN = '' [string] $Author = '' [string] $ByStatement = '' [string] $NumberOfPages = '' [string] $Publishers = '' [string] $PublishDate = '' [string] $PublisherLocation = '' [string] $Subject = '' [string] $LibraryOfCongressClassification = '' [string] $DeweyDecimalClass = '' [string] $Notes = '' [string] $CoverUrlSmall = '' [string] $CoverUrlMedium = '' [string] $CoverUrlLarge = '' # Default Constructor ISBNBook() { } [string] GetISBNBookData($ISBN) { # retMsg = Return Message $retMsg = "Beginning GetISBNBookData for $ISBN at $(Get-Date).ToString('yyyy-MM-dd hh:mm:ss tt')" $isbnFormatted = $ISBN.Replace('-', '').Replace(' ', '') $baseURL = "https://openlibrary.org/api/books?bibkeys=ISBN:" $urlParams = "&jscmd=data&format=json" $url = "$($baseURL)$($isbnFormatted)$($urlParams)" # Set the ISBN property to what was passed in $this.ISBN = $isbnFormatted # Try to get the ISBN data from the OpenLibrary website try { $bookData = Invoke-RestMethod $url $retMsg = "Retrieved ISBN $ISBN from OpenLibrary" } catch { $this.ISBN10 = '0' $this.ISBN13 = '0' $this.Title = "Failed to retrieve ISBN $ISBN. Possible internect connection issue." $retMsg = "Failed to retrieve ISBN $ISBN. Possible internect connection issue." return $retMsg } # Error handler for books not found if ($null -eq $bookData."ISBN:$isbnformatted") { $this.ISBN10 = '0' $this.ISBN13 = '0' $this.Title = "ISBN $ISBN was not found in the OpenLibrary.org database" $retMsg = "ISBN $ISBN was not found in the OpenLibrary.org database" } else # The book was found, assign the data { $this.ISBN10 = $bookData."ISBN:$isbnformatted".identifiers.isbn_10 $this.ISBN13 = $bookData."ISBN:$isbnformatted".identifiers.isbn_13 $this.Title = $bookData."ISBN:$isbnformatted".title $this.LCCN = $bookData."ISBN:$isbnformatted".identifiers.lccn # Remove the "by" (if present) at the beginning of the by statement # We need to check for null though, otherwise using Replace on a null string # will throw an error if ($null -eq $bookData."ISBN:$isbnformatted".by_statement) { $this.ByStatement = '' } else { $this.ByStatement = $bookData."ISBN:$isbnformatted".by_statement.Replace('by ', '') } $this.NumberOfPages = $bookData."ISBN:$isbnformatted".number_of_pages $this.PublishDate = $bookData."ISBN:$isbnformatted".publish_date $this.LibraryOfCongressClassification = $bookData."ISBN:$isbnformatted".classifications.lc_classifications $this.DeweyDecimalClass = $bookData."ISBN:$isbnformatted".classifications.dewey_decimal_class $this.Notes = $bookData."ISBN:$isbnformatted".notes $this.CoverUrlSmall = $bookData."ISBN:$isbnformatted".cover.small $this.CoverUrlMedium = $bookData."ISBN:$isbnformatted".cover.medium $this.CoverUrlLarge = $bookData."ISBN:$isbnformatted".cover.large # 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 $bookData."ISBN:$isbnformatted".authors) { if ($authors.Length -gt 1) { [void]$authors.Append(", $($a.name)") } else { [void]$authors.Append($a.name) } } $this.Author = $authors.ToString() # Subjects can be an array, combine into a single string $subjects = [System.Text.StringBuilder]::new() foreach ($s in $bookData."ISBN:$isbnformatted".subjects) { if ($subjects.Length -gt 1) { [void]$subjects.Append(", $($s.name)") } else { [void]$subjects.Append($s.name) } } $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 $bookData."ISBN:$isbnformatted".publishers) { if ($thePublishers.Length -gt 1) { [void]$thePublishers.Append(", $($p.name)") } else { [void]$thePublishers.Append($p.name) } } $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 $bookData."ISBN:$isbnformatted".publish_places) { if ($locations.Length -gt 1) { [void]$locations.Append(", $($l.name)") } else { [void]$locations.Append($l.name) } } $this.PublisherLocation = $locations.ToString() # All done! Set a success message. $retMsg = "Successfully retrieved data for ISBN $ISBN" } return $retMsg } } |