org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
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limitations under the License.
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package org.apache.poi.xssf.eventusermodel;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.util.SAXHelper;
import org.apache.poi.xssf.usermodel.XSSFRelation;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
/**
* This is a lightweight way to process the Shared Strings
* table. Most of the text cells will reference something
* from in here.
*
Note that each SI entry can have multiple T elements, if the
* string is made up of bits with different formatting.
*
Example input:
*
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<sst xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" count="2" uniqueCount="2">
<si>
<r>
<rPr>
<b />
<sz val="11" />
<color theme="1" />
<rFont val="Calibri" />
<family val="2" />
<scheme val="minor" />
</rPr>
<t>This:</t>
</r>
<r>
<rPr>
<sz val="11" />
<color theme="1" />
<rFont val="Calibri" />
<family val="2" />
<scheme val="minor" />
</rPr>
<t xml:space="preserve">Causes Problems</t>
</r>
</si>
<si>
<t>This does not</t>
</si>
</sst>
*
*
*/
public class ReadOnlySharedStringsTable extends DefaultHandler {
/**
* An integer representing the total count of strings in the workbook. This count does not
* include any numbers, it counts only the total of text strings in the workbook.
*/
private int count;
/**
* An integer representing the total count of unique strings in the Shared String Table.
* A string is unique even if it is a copy of another string, but has different formatting applied
* at the character level.
*/
private int uniqueCount;
/**
* The shared strings table.
*/
private List strings;
/**
* @param pkg
* @throws IOException
* @throws SAXException
* @throws ParserConfigurationException
*/
public ReadOnlySharedStringsTable(OPCPackage pkg)
throws IOException, SAXException {
ArrayList parts =
pkg.getPartsByContentType(XSSFRelation.SHARED_STRINGS.getContentType());
// Some workbooks have no shared strings table.
if (parts.size() > 0) {
PackagePart sstPart = parts.get(0);
readFrom(sstPart.getInputStream());
}
}
/**
* Like POIXMLDocumentPart constructor
*
* @param part
* @param rel_ignored
* @throws IOException
*/
public ReadOnlySharedStringsTable(PackagePart part, PackageRelationship rel_ignored)
throws IOException, SAXException {
readFrom(part.getInputStream());
}
/**
* Read this shared strings table from an XML file.
*
* @param is The input stream containing the XML document.
* @throws IOException if an error occurs while reading.
* @throws SAXException
* @throws ParserConfigurationException
*/
public void readFrom(InputStream is) throws IOException, SAXException {
InputSource sheetSource = new InputSource(is);
try {
XMLReader sheetParser = SAXHelper.newXMLReader();
sheetParser.setContentHandler(this);
sheetParser.parse(sheetSource);
} catch(ParserConfigurationException e) {
throw new RuntimeException("SAX parser appears to be broken - " + e.getMessage());
}
}
/**
* Return an integer representing the total count of strings in the workbook. This count does not
* include any numbers, it counts only the total of text strings in the workbook.
*
* @return the total count of strings in the workbook
*/
public int getCount() {
return this.count;
}
/**
* Returns an integer representing the total count of unique strings in the Shared String Table.
* A string is unique even if it is a copy of another string, but has different formatting applied
* at the character level.
*
* @return the total count of unique strings in the workbook
*/
public int getUniqueCount() {
return this.uniqueCount;
}
/**
* Return the string at a given index.
* Formatting is ignored.
*
* @param idx index of item to return.
* @return the item at the specified position in this Shared String table.
*/
public String getEntryAt(int idx) {
return strings.get(idx);
}
public List getItems() {
return strings;
}
//// ContentHandler methods ////
private StringBuffer characters;
private boolean tIsOpen;
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
if ("sst".equals(name)) {
String count = attributes.getValue("count");
if(count != null) this.count = Integer.parseInt(count);
String uniqueCount = attributes.getValue("uniqueCount");
if(uniqueCount != null) this.uniqueCount = Integer.parseInt(uniqueCount);
this.strings = new ArrayList(this.uniqueCount);
characters = new StringBuffer();
} else if ("si".equals(name)) {
characters.setLength(0);
} else if ("t".equals(name)) {
tIsOpen = true;
}
}
public void endElement(String uri, String localName, String name)
throws SAXException {
if ("si".equals(name)) {
strings.add(characters.toString());
} else if ("t".equals(name)) {
tIsOpen = false;
}
}
/**
* Captures characters only if a t(ext) element is open.
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
if (tIsOpen)
characters.append(ch, start, length);
}
}