EXIficient

EXIficient - open source implementation of the W3C Efficient XML Interchange (EXI) format specification.

The EXI format is a very compact representation for the Extensible Markup Language (XML) Information Set that is intended to simultaneously optimize performance and the utilization of computational resources.

API support

SAX 1
SAX 2
DOM
StAX

Apache Maven Dependency

<dependency>
   <groupId>com.siemens.ct.exi</groupId>
   <artifactId>exificient</artifactId>
   <version>0.9.6</version>
</dependency>

Requirements

Java 1.5 or higher
Xerces2 Java Parser 2.9.11 or higher for schema-informed mode

Library - Code Sample

/*
 *  Setup EXIFactory as required
 */
EXIFactory exiFactory = DefaultEXIFactory.newInstance();
// e.g., add additional settings beyond the default values
// exiFactory.setGrammars(GrammarFactory.newInstance().createGrammars("foo.xsd")); // use XML schema
// exiFactory.setCodingMode(CodingMode.COMPRESSION); // use deflate compression for larger XML files

/*
 *  encode XML to EXI
 */
String fileEXI = "foo.xml.exi"; // EXI output
OutputStream osEXI = new FileOutputStream(fileEXI);
EXIResult exiResult = new EXIResult(exiFactory);
exiResult.setOutputStream(osEXI);
XMLReader xmlReader = XMLReaderFactory.createXMLReader();
xmlReader.setContentHandler( exiResult.getHandler() );
xmlReader.parse("foo.xml"); // parse XML input
osEXI.close();

/*
 *  decode EXI to XML
 */
String fileXML = "foo.xml.exi.xml"; // XML output again
Result result = new StreamResult(fileXML);
InputSource is = new InputSource(fileEXI);
SAXSource exiSource = new EXISource(exiFactory);
exiSource.setInputSource(is);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(exiSource, result);

Command-line Interface

EXIficient also provides a command-line interface.