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<META NAME="AUTHOR" CONTENT="Marc Johnson">
<META NAME="CREATED" CONTENT="20010803;14524700">
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<P ALIGN=CENTER><B>POI Use Cases</B></P>
<P ALIGN=CENTER STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 1:</B> Read existing file
system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in"><B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to read content
of file system</P>
<LI><P STYLE="margin-bottom: 0in">POI - understands POI file system</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in">POI client requests POI to read a
POI file system, providing an <FONT FACE="Courier, monospace">InputStream</FONT>
containing POI file system in question.</P>
<LI><P STYLE="margin-bottom: 0in">POI reads from the <FONT FACE="Courier, monospace">InputStream</FONT>
in 512 byte blocks</P>
<LI><P STYLE="margin-bottom: 0in">POI verifies that the first block
begins with the well known signature (0xE11AB1A1E011CFD0)</P>
<LI><P STYLE="margin-bottom: 0in">POI reads the Block Allocation
Table from the first block and, if necessary, from the XBAT blocks.</P>
<LI><P STYLE="margin-bottom: 0in">POI obtains the start block of the
Property Table and reads the Property Table (use case 9, read file)</P>
<LI><P STYLE="margin-bottom: 0in">POI reads the individual entries
in the Property Table</P>
<LI><P STYLE="margin-bottom: 0in">POI obtains the start block of the
Small Block Allocation Table and reads the Small Block Allocation
Table (use case 9, read file)</P>
<LI><P STYLE="margin-bottom: 0in">POI obtains the start block of the
Small Block store from the first entry in the Property Table and
reads the Small Block Array (use case 9, read file)</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">2a. If the last
block read is not a 512 byte block, the <FONT FACE="Courier, monospace">InputStream</FONT>
is not that of a POI file system, and POI throws an appropriate
exception.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">3a. If the
signature is incorrect, the <FONT FACE="Courier, monospace">InputStream</FONT>
is not that of a POI file system, and POI throws an appropriate
exception.</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 2:</B> Write file system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to write file
system out.</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to write file
system out.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">File system
has been read (use case 1, read existing file system) and
subsequently modified (use case 4, replace file in file system; use
case 5, delete file from file systen; or use case 6, write new file
to file system; in any combination)</P>
</UL>
<P STYLE="margin-bottom: 0in; font-weight: medium">or</P>
<UL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">File system
has been created (use case 3, create new file system)</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI client
provides an <FONT FACE="Courier, monospace">OutputStream</FONT> to
write the file system to.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI gets the
sizes of the Property Table and each file in the file system.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">If any files
in the file system requires storage in a Small Block Array, POI
creates a Small Block Array of sufficient size to hold all of the
small files.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI
calculates the number of big blocks needed to hold all of the large
files, the Property Table, and, if necessary, the Small Block Array
and the Small Block Allocation Table.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI creates a
set of big blocks sufficient to store the Block Allocation Table</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI creates
and writes the header block</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI writes
out the XBAT blocks, if needed.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI writes
out the Small Block Array, if needed</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI writes
out the Small Block Allocation Table, if needed</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI writes
out the Property Table</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI writes
out the large files, if needed</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI closes
the OutputStream.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">6a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">7a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">8a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">9a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">10a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">11a. Exceptions
writing to the <FONT FACE="Courier, monospace">OutputStream</FONT>
will be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">12a. Exceptions
closing the <FONT FACE="Courier, monospace">OutputStream</FONT> will
be propagared back to the POI client.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 3:</B> Create new file
system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to create a new
file system.</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to create a new
file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI creates
an empty Property Table.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B><SPAN STYLE="font-weight: medium">
None</SPAN></P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 4:</B> Replace file in file
system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to replace an
existing file in the file system</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to manage the file
system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">Either</P>
<UL>
<LI><P STYLE="margin-bottom: 0in">The file system has been read (use
case 1, read existing file system) and a file has been extracted
from the file system (use case 7, read existing file from file
system), or</P>
<P STYLE="margin-bottom: 0in">the file system has been created (use
case 3, create new file system) and a file has been written to the
file system (use case 6, write new file to file system)</P>
<LI><P STYLE="margin-bottom: 0in">The file already exists in the
file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI discards
storage of the existing file.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI updates
the existing file's entry in the Property Table</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI stores
the new file's data</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1a. POI throws an
exception if the file does not exist.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 5:</B> Delete file from
file system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to remove a file
from a file system</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to manage the file
system</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">The file system has been read (use
case 1, read existing file system) and a file has been extracted
from the file system (use case 7, read existing file from file
system), or</P>
<P STYLE="margin-bottom: 0in">the file system has been created (use
case 3, create new file system) and a file has been written to the
file system (use case 6, write new file to file system)</P>
<LI><P STYLE="margin-bottom: 0in">The file already exists in the
file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI discards
the specified file's storage</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI discards
the file's Property Table entry</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1a. POI throws an
exception if the file does not exist.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 6:</B> Write new file to
file system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to add a new
file to the file system</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to manage the file
system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B>
</P>
<UL>
<LI><P STYLE="margin-bottom: 0in">The specified file does not yet
exist in the file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The POI
client provides a file name</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI creates a
new Property Table entry for the new file</P>
<LI><P STYLE="margin-bottom: 0in"><SPAN STYLE="font-weight: medium">POI
provides the POI client with an <FONT FACE="Courier, monospace">Output</FONT></SPAN><FONT FACE="Courier, monospace">Stream</FONT>
to write to.</P>
<LI><P STYLE="margin-bottom: 0in">The POI client writes data to the
provided <FONT FACE="Courier, monospace">OutputStream</FONT>.</P>
<LI><P STYLE="margin-bottom: 0in">The POI client closes the provided
<FONT FACE="Courier, monospace">OutputStream</FONT></P>
<LI><P STYLE="margin-bottom: 0in">POI updates the Property Table
entry with the new file's size</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1a. POI throws an
exception if a file with the specified name already exists in the
file system.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1b. POI throws an
exception if the file name is too long. The limit on file name length
is 32 characters.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 7:</B> Read existing file
from file system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to read a file
from the file system.</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to manage the file
system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The file
system is has been read (use case 1, read existing file system) or
has been created and written to (use case 3, create new file system;
use case 6, write new file to file system.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The specified
file exists in the file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The POI
client provides the name of a file to be read</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI provides
an InputStream to read from.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The POI
client reads from the <FONT FACE="Courier, monospace">InputStream</FONT>.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The POI
client closes the <FONT FACE="Courier, monospace">InputStream</FONT>.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1a. POI throws an
exception if no file with the specified name exists.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 8:</B> Read file system
directory</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to know what
files exist in the file system.</P>
<LI><P STYLE="margin-bottom: 0in">POI - POI knows how to manage the
file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The file
system has been read (use case 1, read existing file system) or
created (use case 3, create new file system)</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The POI
client requests the file system directory.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI returns
an <FONT FACE="Courier, monospace">Iterator</FONT>. The <FONT FACE="Courier, monospace">Iterator</FONT>
will not include the root entry in the Property Table, and may be an
<FONT FACE="Courier, monospace">Iterator</FONT> over an empty
<FONT FACE="Courier, monospace">Collection</FONT>.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B><SPAN STYLE="font-weight: medium">
None</SPAN></P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 9:</B> Read file</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI - POI needs to read a file, or
something resembling a file (i.e., the Property Table, the Small
Block Array, or the Small Block Allocation Table)</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI begins
with a start block, a file size, and a flag indicating whether to
use the Big Block Allocation Table or the Small Block Allocation
Table</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI returns
an InputStream.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">Reads from
the InputStream are performed by walking the specified Block
Allocation Table and reading the blocks indicated.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI closes
the InputStream when finished reading the file, or its client wants
to close the InputStream.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">3a. An exception
will be thrown if the specified Block Allocation Table is corrupt, as
evidenced by an index pointing to a non-existent block, or by a chain
extending past the known size of the file.</P>
<P STYLE="margin-bottom: 0in"><BR>
</P>
<P STYLE="margin-bottom: 0in"><B>Use Case 10:</B> Rename existing
file in file system</P>
<P STYLE="margin-bottom: 0in"><B>Primary Actor:</B> POI client</P>
<P STYLE="margin-bottom: 0in"><B>Scope:</B> POI</P>
<P STYLE="margin-bottom: 0in; page-break-before: auto; page-break-after: auto">
<B>Level:</B> Summary</P>
<P STYLE="margin-bottom: 0in"><B>Stakeholders and Interests:</B></P>
<UL>
<LI><P STYLE="margin-bottom: 0in">POI client- wants to rename an
existing file in the file system.</P>
<LI><P STYLE="margin-bottom: 0in">POI - knows how to manage the file
system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Precondition:</B>
</P>
<UL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The file
system is has been read (use case 1, read existing file system) or
has been created and written to (use case 3, create new file system;
use case 6, write new file to file system.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The specified
file exists in the file system.</P>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">The new name
for the file does not duplicate another file in the file system.</P>
</UL>
<P STYLE="margin-bottom: 0in"><B>Minimal Guarantee:</B> None</P>
<P STYLE="margin-bottom: 0in"><B>Main Success Guarantee:</B></P>
<OL>
<LI><P STYLE="margin-bottom: 0in; font-weight: medium">POI updates
the Property Table entry for the specified file with its new name.</P>
</OL>
<P STYLE="margin-bottom: 0in"><B>Extensions:</B></P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1a. If the old
file name is not in the file system, POI throws an exception.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1b. If the new
file name already exists in the file system, POI throws an exception.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium">1c. If the new
file name is too long (the limit is 32 characters), POI throws an
exception.</P>
<P STYLE="margin-bottom: 0in; font-weight: medium"><BR>
</P>
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