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Tweaks to the iterator use guides for hssf

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@618690 13f79535-47bb-0310-9956-ffa450edef68
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Nick Burch 2008-02-05 16:21:21 +00:00
parent 7377714861
commit fc6afc8849
1 changed files with 40 additions and 4 deletions
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44
src/documentation/content/xdocs/hssf/quick-guide.xml
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@ -236,16 +236,51 @@
</source> </source>
</section> </section>
<anchor id="Iterator"/> <anchor id="Iterator"/>
<section><title>Iterate over rows and cells (including Java 5 foreach loops)</title> <section><title>Iterate over rows and cells</title>
<p>Sometimes, you'd like to just iterate over all the rows in <p>Sometimes, you'd like to just iterate over all the rows in
a sheet, or all the cells in a row. If you are using Java a sheet, or all the cells in a row. This is possible with
5 or later, then this is especially handy, as it'll allow the a simple for loop.</p>
new foreach loop support to work.</p>
<p>Luckily, this is very easy. HSSFRow defines a <p>Luckily, this is very easy. HSSFRow defines a
<em>CellIterator</em> inner class to handle iterating over <em>CellIterator</em> inner class to handle iterating over
the cells (get one with a call to <em>row.cellIterator()</em>), the cells (get one with a call to <em>row.cellIterator()</em>),
and HSSFSheet provides a <em>rowIterator()</em> method to and HSSFSheet provides a <em>rowIterator()</em> method to
give an iterator over all the rows.</p> give an iterator over all the rows.</p>
<p>(Unfortunately, due to the broken and
backwards-incompatible way that Java 5 foreach loops were
implemented, it isn't possible to use them on a codebase
that supports Java 1.4, as POI does)</p>
<source>
HSSFSheet sheet = wb.getSheetAt(0);
for (Iterator rit = sheet.rowIterator(); rit.hasNext(); ) {
HSSFRow row = (HSSFRow)rit.next();
for (Iterator cit = row.cellIterator(); cit.hasNext(); ) {
HSSFCell cell = (HSSFCell)cit.next();
// Do something here
}
}
</source>
<source>
HSSFSheet sheet = wb.getSheetAt(0);
for (Iterator&lt;HSSFRow&gt; rit = (Iterator&lt;HSSFRow&gt;)sheet.rowIterator(); rit.hasNext(); ) {
HSSFRow row = rit.next();
for (Iterator&lt;HSSFCell&gt; cit = (Iterator&lt;HSSFCell&gt;)row.cellIterator(); cit.hasNext(); ) {
HSSFCell cell = cit.next();
// Do something here
}
}
</source>
</section>
<section><title>Iterate over rows and cells using Java 1.5 foreach loops - OOXML Branch Only</title>
<p>Sometimes, you'd like to just iterate over all the rows in
a sheet, or all the cells in a row. If you are using Java
5 or later, then this is especially handy, as it'll allow the
new foreach loop support to work.</p>
<p>Luckily, this is very easy. Both HSSFSheet and HSSFRow
implement <em>java.lang.Iterable</em> to allow foreach
loops. For HSSFRow this allows access to the
<em>CellIterator</em> inner class to handle iterating over
the cells, and for HSSFSheet gives the
<em>rowIterator()</em> to iterator over all the rows.</p>
<source> <source>
HSSFSheet sheet = wb.getSheetAt(0); HSSFSheet sheet = wb.getSheetAt(0);
for (HSSFRow row : sheet.rowIterator()) { for (HSSFRow row : sheet.rowIterator()) {
@ -254,6 +289,7 @@
} }
} }
</source> </source>
<note>This only works on the OOXML branch of POI</note>
</section> </section>
<anchor id="TextExtraction"/> <anchor id="TextExtraction"/>
<section><title>Text Extraction</title> <section><title>Text Extraction</title>