JAVA For these JSONTable steps, use the Jackson API which is dependency managed by Maven.

$1$ Serialize all types using corresponding JSON equivalents or analogs.

$2$ Deserialize all types with minimal custom parsing.

$3$ Use JSON objects and arrays efficiently and conventionally.

B The following private fields:

$1$ A static constant path for the base directories, which are db sub tables relative to the project directory.

$2$ A path for the file, which is the table file structure in JSON format.

$3$ A reference for the tree, which is the root object node representing the contents of the file.

$4$ A static constant reference for the mapper, which is a new reusable JSON mapper instance with static factory methods.

$5$ No fields for the degree, size, fingerprint, or any other fields $($unlike in previous modules$).$

C A $2-$ary constructor which takes a name parameter $($string$)$ and a columns parameter $($list of strings$).$

$1$ Create the base directories, if needed.

$2$ Initialize the path field by resolving the given name plus the $.$json extension relative to the base directories.

$3$ If the file doesn$$t exist at the path field, create it$.$

$4$ Use the mapper to create a new object node, and initialize the tree field to it$.$

$5$ Put a new object node at the metadata property of the tree.

$6$ Put a new object node at the data property of the tree.

$7$ Put the given columns as suitable at the columns property under the metadata node.

$8$ Call the flush method to update the file.

D A $1-$ary constructor which takes a name parameter $($string$)$ only.

$1$ Initialize the path field by resolving the given name plus the $.$json extension relative to the base directories.

$2$ If the file doesn$$t exist at the path field, throw an illegal argument exception.

$3$ Use the mapper to read the root object node from the file, and initialize the tree field to it$.$

$4$ When catching a parse exception for an invalid JSON file, throw an illegal state exception.

E A public clear method.

$1$ Remove all properties under the data node.

$2$ Call the flush method to update the file.

F A public flush method.

$1$ Use the mapper to write the tree to the file.

$2$ Configure the file output to be pretty$-$printed.

G Public methods for the following statistics and predicates:

$1$ The name method which returns the name of the file, excluding the base directories and the $.$json extension.

$2$ The columns method which returns appropriately from the columns property under the metadata node.

$3$ The degree method which returns the size of the list of columns which is returned by the columns method.

$4$ The size method which returns the size of the data node.

$5$ The hashCode method which returns the sum of the hash codes from the rows for each property under the data node.

$6$ The equals method which returns true if the parameter is any table with the same fingerprint $($as in previous modules$).$

$7$ Don$$t implement capacity or loadFactor, because this is a FileTable, not a DataTable.

H A public iterator method which returns an iterator of rows.

$1$ Create an empty list of rows.

$2$ For each property under the data node, create a new row from that property, and add it to the list.

$3$ Call iterator on that list and return the corresponding iterator.

$4$ Don$$t implement a new iterator using an anonymous class $($unlike in previous modules$).$

I A public toString method.

$1$ Return an unsorted view of the table by calling toTabularView.