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Using EDIReader with J2SE 5.0 XPath Evaluation

Saturday, 03 February 2007

The XPath Evaluation API, new in Java 2 SE 5.0, may be used to query EDI content with EDIReader. This provides an alternative to XSLT or JDom/Jaxen approaches which are still available. To use the XPath Evaluation API, you use EDIReader as a SAX parser to build a W3C DOM by means of a Transformer. XPath queries can then be performed against the EDI data as illustrated in the program portion shown below.

import com.berryworks.edireader.EDIReaderFactory;

import ...

public class QueryEDIwithXPath {
InputSource inputSource =

new InputSource( new FileReader( "edi.dat" ));

String query =

"/ediroot/interchange/group/transaction/@DocType";

public String query() throws Exception {
XMLReader ediReader =

               EDIReaderFactory.createEDIReader( inputSource );

            DOMResult dom = new DOMResult();
            Transformer transformer =

TransformerFactory.newInstance().newTransformer();
transformer.transform(

new SAXSource( ediReader, inputSource), dom );

return XPathFactory.newInstance().newXPath().

evaluate( query, dom.getNode() );
}
}

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