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Update JavaDocs to make it clearer to users about the different constuctors

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1352685 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch 2012-06-21 21:00:54 +00:00
parent 21e710c082
commit 984af0b3a8
1 changed files with 23 additions and 2 deletions
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25
src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFWorkbook.java
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@ -19,6 +19,7 @@ package org.apache.poi.xssf.usermodel;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@ -172,9 +173,15 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook, Iterable<X
/**
* Constructs a XSSFWorkbook object given a OpenXML4J <code>Package</code> object,
* see <a href="http://openxml4j.org/">www.openxml4j.org</a>.
* see <a href="http://poi.apache.org/oxml4j/">http://poi.apache.org/oxml4j/</a>.
*
* Once you have finished working with the Workbook, you should close the package
* by calling pkg.close, to avoid leaving file handles open.
*
* Creating a XSSFWorkbook from a file-backed OPC Package has a lower memory
* footprint than an InputStream backed one.
*
* @param pkg the OpenXML4J <code>Package</code> object.
* @param pkg the OpenXML4J <code>OPC Package</code> object.
*/
public XSSFWorkbook(OPCPackage pkg) throws IOException {
super(pkg);
@ -183,6 +190,20 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook, Iterable<X
load(XSSFFactory.getInstance());
}
/**
* Constructs a XSSFWorkbook object, by buffering the whole stream into memory
* and then opening an {@link OPCPackage} object for it.
*
* Using an {@link InputStream} requires more memory than using a File, so
* if a {@link File} is available then you should instead do something like
* <pre><code>
* OPCPackage pkg = OPCPackage.open(path);
* XSSFWorkbook wb = new XSSFWorkbook(pkg);
* // work with the wb object
* ......
* pkg.close(); // gracefully closes the underlying zip file
* </code></pre>
*/
public XSSFWorkbook(InputStream is) throws IOException {
super(PackageHelper.open(is));