documentation update for 2.0
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353455 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Avik Sengupta
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<p>
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Maybe it's unwise to advertise your competitors but we believe
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competition is good and we have the best support reading and
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write Excel workbooks currently available.
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write Excel workbooks currently available. This however does not
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purport to be a complete list.
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</p>
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<table>
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<tr>
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@ -12,7 +12,7 @@
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<section><title>Introduction</title>
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<p>
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This document describes the current state of formula support in POI.
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The information in this document applies to the 2.0-dev version of POI (i.e. CVS HEAD).
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The information in this document currently applies to the 2.0 version of POI.
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Since this area is a work in progress, this document will be updated with new features as and
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when they are added.
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</p>
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@ -36,16 +36,14 @@
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<li>String, integer and floating point literals</li>
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<li>Area references</li>
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<li>Relative or absolute references</li>
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<li>Arithmetic Operators</li>
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<li>Sheet Functions</li>
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<li>Arithmetic and logical operators</li>
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<li>Sheet or Macro Functions (inlcuding logical functions)</li>
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<li>Sheet References</li>
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<li>Formual return values (number or string)</li>
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</ul>
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</section>
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<section><title>Partially supported</title>
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<ul>
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<li>
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The formula parser now has the ability to parse formulas containing strings. However
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formulas that return a string value are not yet supported.
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</li>
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<li>Formula tokens in Excel are stored in one of three possible <em> classes </em>:
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Reference, Value and Array. Based on the location of a token, its class can change
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in complicated and undocumented ways. While we have support for most cases, we
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@ -60,9 +58,10 @@
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<section><title>Not yet supported</title>
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<ul>
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<li>Array formulas</li>
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<li>Formulas with logical operations (IF) </li>
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<li>Sheet References in formulas</li>
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<li>Everything else :) </li>
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<li>Unary Operators</li>
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<li>3D References</li>
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<li>Error Values (cells containing #REF's or #VALUE's)</li>
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<li>Everything else :) </li>
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</ul>
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</section>
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@ -87,4 +86,4 @@
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</section>
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</body>
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</document>
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</document>
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@ -11,23 +11,23 @@
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</authors>
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</header>
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<body>
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<section><title>How to use the HSSF prototype API</title>
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<section><title>How to use the HSSF API</title>
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<section><title>Capabilities</title>
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<p>This release of the how-to outlines functionality for the CVS HEAD.
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Those looking for information on previous releases should
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look in the documentation distributed with that release.</p>
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<p>
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This release allows numeric and string cell values to be written to
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or read from an XLS file as well as reading and writing dates. Also
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HSSF allows numeric, string, date or formuala cell values to be written to
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or read from an XLS file. Also
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in this release is row and column sizing, cell styling (bold,
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italics, borders,etc), and support for both built-in and user
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defined data formats. New
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to this release is an event-based API for reading XLS files.
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defined data formats. Also available is
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an event-based API for reading XLS files.
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It differs greatly from the read/write API
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and is intended for intermediate developers who need a smaller
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memory footprint. It will also serve as the basis for the HSSF
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Generator.</p>
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memory footprint.
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</p>
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</section>
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<section><title>General Use</title>
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<section><title>User API</title>
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@ -474,25 +474,15 @@ yet. When it does something, we'll document it.</p>
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</section>
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<section><title>What's Next?</title>
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<p>This release contains code that supports "internationalization"
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or more accurately non-US/UK languages; however, it has not been
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tested with the new API changes (please help us with this). We've
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shifted focus a bit for this release in recognition of the
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international support we've gotten. We're going to focus on western
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European languages for our first beta. We're more than happy to
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accept help in supporting non-Western European languages if someone
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who knows what they're doing in this area is willing to pitch in!
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(There is next to no documentation on what is necessary to support
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such a move and its really hard to support a language when you don't even
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know the alphabet).</p>
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<p>This release of HSSF does not yet support Formulas. I've been
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focusing on the requests I've gotten in. That being said, if we get
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more user feedback on what is most useful first we'll aim for that.
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As a general principal, HSSF's goal is to support HSSF-Serializer
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(meaning an emphasis on write). We would like to hear from you! How
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are you using HSSF/POIFS? How would you like to use it? What features
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are most important first?
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</p>
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<p>Further effort on HSSF is going to focus on the following major areas: </p>
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<ul>
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<li>Performance: A lot of work is going on in CVS and mailing lists for greatly improving the
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memory efficiency of POI, as well as improving speed. Many approaches have been suggested, and a lot of code as been written.
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It now needs a lot of testing and bugfixing. </li>
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<li>Charts: This is a hard problem, with very little documentation.</li>
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</ul>
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<p><link href="../getinvolved/index.html"> So jump in! </link> </p>
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</section>
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</section>
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@ -25,23 +25,17 @@
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<li>a full usermodel api for creating, reading and modifying XLS files</li>
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</ul>
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<p>
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Truth be told there is probably a better way to generate your spreadsheet
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generation (yet you'll still be using HSSF indirectly). At the time of
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this writing we're in the process of moving the HSSF Serializer over to
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the
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<link href="http://xml.apache.org/cocoon">Apache Cocoon
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Project</link>. With Cocoon you can serialize any XML datasource (of
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which might be a ESQL page outputting in SQL for instance) by simply
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An alternate way of generating a spreadsheet is via the <link href="http://cocoon.apache.org">Cocoon</link> serializer (yet you'll still be using HSSF indirectly).
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With Cocoon you can serialize any XML datasource (which might be a ESQL page outputting in SQL for instance) by simply
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applying the stylesheet and designating the serializer.
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</p>
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<p>
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If you're merely reading spreadsheet data, then use the eventmodel api
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in the org.apache.poi.hssf.eventmodel package.
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in the org.apache.poi.hssf.eventusermodel package.
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</p>
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<p>
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If you're modifying spreadsheet data then use the usermodel api. You
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can also generate spreadsheets this way, but using Cocoon (which will do
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it this way indirectly) is the best way...we promise.
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can also generate spreadsheets this way.
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</p>
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</section>
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</authors>
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</header>
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<body>
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<section><title>Version 1.5 limitations</title>
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<section><title>Version 2.0 limitations</title>
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<p>
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The intent of this document is to outline some of the known limitations of the
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POI HSSF API's. It is not intended to be complete list of every bug or missing
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<ul>
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<li>
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Charts<br/><br/>
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You can not currently create charts. This is planned for the 2.0 release. You can
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You can not currently create charts. You can
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however create a chart in Excel, modify the chart data values using HSSF and write
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a new spreadsheet out. This is possible because POI attempts to keep existing records
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intact as far as possible.<br/><br/>
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@ -39,15 +39,13 @@
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</li>
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<li>
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Macros<br/><br/>
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Macros can not be created. The are currently no plans to support macros. Reading
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workbooks containing macros is supported but attempting to write those workbooks
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will fail. This is because macros are stored as extra file sytems within the
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compound document, and these are not currently kept when the file is rewritten.<br/><br/>
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Macros can not be created. However, reading and re-writing files containing macros will
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safely preserve the macros.<br/><br/>
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</li>
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<li>
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Pivot Tables<br/><br/>
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Generating pivot tables is not supported. Reading spreadsheets containing pivot tables
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has not been tested.
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Generating pivot tables is not supported. It has been reported that files containing pivot
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tables can be read and re-written safely.
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</li>
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</ul>
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</section>
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<authors>
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<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
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<person id="GJS" name="Glen Stampoultzis" email="poi-user@jakarta.apache.org"/>
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<person id="AS" name="Avik Sengupta" email="poi-user@jakarta.apache.org"/>
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</authors>
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</header>
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@ -31,7 +32,7 @@
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<p>
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As a general policy we try to collaborate as much as possible with other projects to
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provide this functionality. Examples include: <link href="http://xml.apache.org/cocoon">Cocoon</link> for
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which you'll soon find generators and serializers for our projects;
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which there are serializers for HSSF;
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<link href="http://www.openoffice.org">Open Office.org</link> with whom we collaborate in documenting the
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XLS format; and <link href="http://jakarta.apache.org/lucene">Lucene</link> for which we'll soon have file
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format interpretors. When practical, we donate components directly to those projects for POI-enabling them.
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</p>
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<p>
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You'd use POIFS if you had a document written in OLE 2 Compound Document Format, probably written using
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MFC, that you needed to read in Java. Alternatively, you'd use POI to write OLE 2 Compound Document Format
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MFC, that you needed to read in Java. Alternatively, you'd use POIFS to write OLE 2 Compound Document Format
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if you needed to inter-operate with software running on the Windows platform. We are not just bragging when
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we say that POIFS is the most complete and correct implementation of this file format to date!
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</p>
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<section><title>HWPF</title>
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<p>HWPF is our port of the Microsoft Word 97 file format to pure Java. It supports read and write capability.
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Please see <link href="./hwpf/index.html">the HWPF project page for more information</link>. This component is
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in the early stages of design. Jump in!</p>
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in the early stages of development.It can already read and write simple files. Jump in!</p>
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</section>
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<section><title>HPSF</title>
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<p>HPSF is our port of the OLE 2 property set format to pure
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<todo><title>Things To Do for Poi</title>
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<devs>
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<!-- in strict alphabetical order -->
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<person id="AO" name="Andrew C. Oliver" email="acoliver@apache.org"/>
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<person id="GS" name="Glen Stampoultzis" email="poi-user@jakarta.apache.org"/>
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<person id="MJ" name="Marc Johnson" email="mjohnson at apache dot org"/>
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<person id="NKB" name="Nicola Ken Barozzi" email="barozzi@nicolaken.com"/>
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<person id="RA" name="Ryan Ackley" email="poi-dev@jakarta.apache.org"/>
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<person id="AS" name="Avik Sengupta" email="poi-dev@jakarta.apache.org"/>
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<person id="open" name="POI Developers" email="poi-dev@jakarta.apache.org"/>
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<person id="Everyone" name="POI Developers" email="poi-dev@jakarta.apache.org"/>
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</devs>
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<actions priority="high">
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<action context="code" dev="NKB">
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<action context="code" dev="RA">
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Finish HWPF
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</action>
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<action context="code" dev="GS">
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Finish Charts
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</action>
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<action context="code" dev="open">
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Finish Formulas.
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<action context="code" dev="Everyone">
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Evaluate and bugfix performance code in HEAD
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</action>
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</actions>
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<actions priority="medium">
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<action context="code" dev="open">
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Expose functionality in low level records in higher level API
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</action>
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<action context="code" dev="open">
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Implement more record types.
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</action>
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Create new adapter object for handling MulBlank, MulRk, Rk
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records.
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</action>
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<action context="code" dev="open">
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Add a way to copy sheets.
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<action context="code" dev="AS">
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Improve formulas (Shared Formulas, Unkown PTG's)
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</action>
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</actions>
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@ -79,3 +79,6 @@ div#banner {
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.crumbSeparator
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{
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}
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#authors {
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font-size: x-small;
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}
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@ -48,7 +48,7 @@ $Id$
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</xsl:for-each>
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</div>
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</xsl:if>
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<xsl:call-template name="pdflink"/>
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<!--xsl:call-template name="pdflink"/-->
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</body>
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</document>
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</xsl:if>
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