d6e98794b4
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352224 13f79535-47bb-0310-9956-ffa450edef68
517 lines
10 KiB
HTML
517 lines
10 KiB
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<td valign="top" align="left"><a href="http://jakarta.apache.org/index.html"><img hspace="0" vspace="0" border="0" src="images/jakarta-logo.gif"></a></td><td width="100%" valign="top" align="left" bgcolor="#ffffff"><img hspace="0" vspace="0" border="0" align="right" src="images/header.gif"></td>
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<td colspan="2" bgcolor="#525d76"><span class="c1"><a class="black" href="http://www.apache.org/">www.apache.org ></a><a class="black" href="http://jakarta.apache.org/">jakarta.apache.org ></a><a href="http://jakarta.apache.org/poi/" class="black">jakarta.apache.org/poi</a></span></td>
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<a class="s1" href="../index.html">Main</a>
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<span class="s1">HSSF</span>
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<a class="s1" href="use-case.html">Use Case</a>
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<title>HSSF Use Cases</title>
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<td bgcolor="#f3dd61"><span class="title">HSSF Use Cases</span></td>
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<table cellspacing="0" cellpadding="2" border="0" width="100%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>HSSF Use Cases</b></font></font></td>
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Use Case 1: Read existing HSSF</b></font></font></td>
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<p align="justify">
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<em>Primary Actor:</em> HSSF client</p>
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<p align="justify">
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<em>Scope:</em> HSSF</p>
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<p align="justify">
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<em>Level:</em> Summary</p>
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<p align="justify">
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<em>Stakeholders and Interests:</em>
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</p>
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<ul>
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<li>HSSF client- wants to read content
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of HSSF file</li>
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<li>HSSF - understands HSSF file</li>
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<li>POIFS - understands underlying POI
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file system</li>
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</ul>
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<p align="justify">
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<em>Precondition:</em> None</p>
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<p align="justify">
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<em>Minimal Guarantee:</em> None</p>
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<p align="justify">
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<em>Main Success Guarantee:</em>
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</p>
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<ol>
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<li>HSSF client requests HSSF to read
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a HSSF file, providing an InputStream
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containing HSSF file in question.</li>
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<li>HSSF requests POIFS to read the HSSF
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file, passing the InputStream
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object to POIFS (POIFS use case 1, read existing file system)</li>
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<li>HSSF reads the "Workbook"
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file (use case 4, read workbook entry)</li>
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</ol>
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<p align="justify">
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<em>Extensions:</em>
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</p>
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<p align="justify">2a. Exceptions
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thrown by POIFS will be passed on to the HSSF client.</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Use Case 2: Write HSSF file</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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<em>Primary Actor:</em> HSSF client</p>
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<p align="justify">
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<em>Scope:</em> HSSF</p>
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<p align="justify">
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<em>Level:</em> Summary</p>
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<p align="justify">
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<em>Stakeholders and Interests:</em>
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</p>
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<ul>
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<li>HSSF client- wants to write file
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out.</li>
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<li>HSSF - knows how to write file
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out.</li>
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<li>POIFS - knows how to write file
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system out.</li>
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</ul>
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<p align="justify">
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<em>Precondition:</em>
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</p>
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<ul>
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<li>File has been
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read (use case 1, read existing HSSF file) and subsequently modified
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or file has been created (use case 3, create HSSF file)</li>
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</ul>
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<p align="justify">
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<em>Minimal Guarantee:</em> None</p>
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<p align="justify">
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<em>Main Success Guarantee:</em>
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</p>
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<ol>
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<li>HSSF client
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provides an OutputStream to
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write the file to.</li>
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<li>HSSF writes
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the "Workbook" to its associated POIFS file system (use case
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5, write workbook entry)</li>
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<li>HSSF
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requests POIFS to write its file system out, using the OutputStream
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obtained from the HSSF client (POIFS use case 2, write file system).</li>
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</ol>
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<p align="justify">
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<em>Extensions:</em>
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</p>
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<p align="justify">3a. Exceptions
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from POIFS are passed to the HSSF client.</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Use Case 3:Create HSSF file</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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<em>Primary Actor:</em> HSSF client</p>
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<p align="justify">
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<em>Scope:</em> HSSF</p>
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<p align="justify">
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<em>Level:</em> Summary</p>
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<p align="justify">
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<em>Stakeholders and Interests:</em>
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</p>
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<ul>
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<li>HSSF client- wants to create a new
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file.</li>
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<li>HSSF - knows how to create a new
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file.</li>
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<li>POIFS - knows how to creat a new
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file system.</li>
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</ul>
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<p align="justify">
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<em>Precondition:</em>
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</p>
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<p align="justify">
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<em>Minimal Guarantee:</em> None</p>
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<p align="justify">
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<em>Main Success Guarantee:</em>
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</p>
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<ol>
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<li>HSSF requests
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POIFS to create a new file system (POIFS use case 3, create new file
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system)</li>
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</ol>
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<p align="justify">
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<em>Extensions:</em>
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None</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Use Case 4: Read workbook entry</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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<em>Primary Actor:</em> HSSF</p>
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<p align="justify">
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<em>Scope:</em> HSSF</p>
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<p align="justify">
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<em>Level:</em> Summary</p>
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<p align="justify">
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<em>Stakeholders and Interests:</em>
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</p>
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<ul>
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<li>HSSF - knows how to read the
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workbook entry</li>
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<li>POIFS - knows how to manage the file
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system.</li>
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</ul>
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<p align="justify">
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<em>Precondition:</em>
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</p>
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<ul>
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<li>The file
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system has been read (use case 1, read existing HSSF file) or has
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been created and written to (use case 3, create HSSF file system;
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use case 5, write workbook entry).</li>
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</ul>
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<p align="justify">
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<em>Minimal
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Guarantee:</em> None</p>
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<p align="justify">
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<em>Main Success Guarantee:</em>
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</p>
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<ol>
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<li>
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HSSF requests POIFS for the "Workbook" file</li>
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<li>POIFS returns
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an InputStream for the file.</li>
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<li>HSSF reads
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from the InputStream provided by POIFS</li>
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<li>HSSF closes
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the InputStream provided by POIFS</li>
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</ol>
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<p align="justify">
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<em>Extensions:</em>
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</p>
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<p align="justify">3a. Exceptions
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thrown by POIFS will be passed on</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Use Case 5: Write workbook entry</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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<em>Primary Actor:</em> HSSF</p>
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<p align="justify">
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<em>Scope:</em> HSSF</p>
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<p align="justify">
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<em>Level:</em> Summary</p>
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<p align="justify">
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<em>Stakeholders and Interests:</em>
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</p>
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<ul>
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<li>HSSF - knows how to manage the
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write the workbook entry.</li>
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<li>POIFS - knows how to manage the file
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system.</li>
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</ul>
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<p align="justify">
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<em>Precondition:</em>
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</p>
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<ul>
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<li>Either an existing HSSF file has
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been read (use case 1, read existing HSSF file) or an HSSF file has
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been created (use case 3, create HSSF file).</li>
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</ul>
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<p align="justify">
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<em>Minimal Guarantee:</em> None</p>
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<p align="justify">
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<em>Main Success Guarantee:</em>
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</p>
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<ol>
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<li>HSSF
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checks the POIFS file system directory for the "Workbook"
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file (POIFS use case 8, read file system directory)</li>
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<li>If "Workbook" is in the directory, HSSF requests POIFS to
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replace it with the new workbook entry (POIFS use case 4, replace file
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in file system). Otherwise, HSSF requests POIFS to write the new
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workbook file, with the name "Workbook" (POIFS use case 6,
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write new file to file system)</li>
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</ol>
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<p align="justify">
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<em>Extensions:</em>None</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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<br>
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<table width="100%" border="0" cellspacing="0" cellpadding="0">
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<tbody>
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<tr>
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<td>
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<hr noshade="" size="1">
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</td>
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<tr>
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<td align="center"><i>Copyright © 2002 Apache Software Foundation</i></td>
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<td align="right" width="100%">
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<br>
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</td>
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<td align="right" width="100%"><a href="http://krysalis.org/"><img alt="Krysalis Logo" src="images/krysalis-compatible.png"></a><a href="http://xml.apache.org/cocoon/"><img alt="Cocoon Logo" src="images/built-with-cocoon.png"></a></td>
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