Processing XML - Java - page 802

get a reference to a parser and call its methods with objects representing the input files. The
difference is that the parser returns an XML DOM, a tree of objects in memory. XParse in
Example 20-8 simply parses an XML document. Despite the simplicity, I use it a lot;
whenever I have an XML file whose validity is in question, I just pass it to XParse .

Example 20-8. XParse.java
public public static static void void main ( String [] av ) throws throws SAXException {

iif ( av . length == 0 ) {
System . err . println ( "Usage: XParse file" );
return return ;

}
boolean

boolean validate = false false ;

Schema schema = null

null ;

try try {

for

for ( int int i = 0 ; i < av . length ; i ++) {

iif ( av [ i ]. equals ( "-v" ))
validate = true true ;

else else if ( av [ i ]. equals ( "-a" )) {

// "create a SchemaFactory capable of understanding W3C schemas"
// -- from the Javadoc page
SchemaFactory schemaFactory =
SchemaFactory . newInstance ( XMLConstants . W3C_XML_SCHEMA_NS_URI );

// load the W3c XML schema, represented by a Schema instance
String schemaLocation = av [++ i ];
File schemaFile = new new File ( schemaLocation );

iif (! schemaFile . exists ()) {
throw throw new new IOException (

"Schema location = " + schemaLocation + " does not exist" );

}
schema = schemaFactory . newSchema ( schemaFile );

} else else {

File xmlFile = new new File ( av [ i ]);

System . err . println (
"Parsing " + xmlFile . getAbsolutePath () + "..." );

DocumentBuilderFactory dbFactory =
DocumentBuilderFactory . newInstance ();
iif ( validate ) {
iif ( schema != null

null ) {
dbFactory . setSchema ( schema );
} else

else {
dbFactory . setValidating ( true true );