Examples of com.sun.msv.grammar.ExpressionPool

com.sun.msv.grammar.ExpressionPool
Creates a new Expression by combining existing expressions. all expressions are memorized and unified so that every subexpression will be shared and reused. Optimization will be also done transparently. For example, createChoice(P,P) will result in P. createSequence(P,nullSet) will result in nullSet. Furthermore, associative operators are grouped to the left. createChoice( (P|Q), (R|S) ) will be ((P|Q)|R)|S.
Although this unification is essential, this is also the performance bottle neck. In particular, createChoice and createSequence are two most commonly called methods.
For example, when validating a DocBook XML (150KB) twice against DocBook.trex(237KB), createChoice is called 63000 times and createSequence called 23000 times. (the third is the createOptional method and only 1560 times.) And they took more than 10% of validation time, which is the worst time-consuming method.
Therefore, please beware that this class includes several ugly code optimization. @author Kohsuke KAWAGUCHI

    protected Schema getSchemaForSchema() {
        return XMLSchemaReader.getXmlSchemaForXmlSchema();
    }


    protected GrammarReader getReader() {
        return new XMLSchemaReader( createController(), factory, new ExpressionPool() );
    }

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    protected Schema getSchemaForSchema() {
        return RELAXNGCompReader.getRELAXNGSchema4Schema();
    }
    
    protected GrammarReader getReader() {
        return new RELAXNGCompReader( createController(), factory, new ExpressionPool() );
    }

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public class TXMLSchemaReader extends XMLSchemaReader implements TahitiGrammarReader {
  
  public TXMLSchemaReader(
    GrammarReaderController controller,
    SAXParserFactory parserFactory ) {
    super( controller, parserFactory, new StateFactory(), new ExpressionPool() );
    
    // ignore the body of ur-type.
    complexUrType.exp = new IgnoreItem(complexUrType.exp);
    // ignore the schema location attribute
    xsiSchemaLocationExp.exp = new IgnoreItem( xsiSchemaLocationExp.exp );

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 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class SerialTest {
    public static void main(String[] args) throws Exception {
        if( args[0].equals("write") ) {
          ExpressionPool pool = new ExpressionPool();
            pool.createAnyString();
            pool.createChoice( pool.createData(StringType.theInstance), pool.createEpsilon() );
        
            ObjectOutputStream oos = new ObjectOutputStream(System.out);
            oos.writeObject(pool);
            oos.close();
        } else {
            ObjectInputStream ois = new ObjectInputStream(System.in);
            ExpressionPool pool = (ExpressionPool)ois.readObject();
            System.out.println(pool);
        }
    }

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        if( args[0].equals("trex") ) {
            TREXGrammarReader reader = new TREXGrammarReader(
                new com.sun.msv.driver.textui.DebugController(false,false),
                factory,
                new TypedTREXGrammarInterceptor(),
                new ExpressionPool() );
            ((XMLFilter)reader).parse(args[1]);
            grammar = reader.getResult();
        } else {
            grammar = GrammarLoader.loadSchema( args[1],
                new com.sun.msv.driver.textui.DebugController(false,false),

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import com.sun.msv.reader.dtd.DTDReader;


public class DTDValidator extends AbstractValidatorExImpl {


    public Grammar parseSchema( InputSource is, GrammarReaderController controller ) throws Exception {
        Grammar g = DTDReader.parse(is,controller,new ExpressionPool() );
        if(g==null)        return null;
        return g;
    }

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    return reader.getResult();
  }


  /** easy-to-use constructor. */
  public SRELAXNGReader( GrammarReaderController controller, SAXParserFactory parserFactory) {
    this( controller, parserFactory, new ExpressionPool() );
  }

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     * Computes the union of two grammars.
     */
    private Grammar union( Grammar g1, Grammar g2 ) {
        // either g1.getPool() or g2.getPool() is OK.
        // this is just a metter of performance problem.
        final ExpressionPool pool = g1.getPool();
        final Expression top = pool.createChoice(g1.getTopLevel(),g2.getTopLevel());
        
        return new Grammar() {
            public ExpressionPool getPool() {
                return pool;
            }

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        this.pool = pool;
        this.parentGrammar = parentGrammar;
    }
    
    public TREXGrammar( ExpressionPool pool )    { this(pool,null); }
    public TREXGrammar() { this(new ExpressionPool(),null); }

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 * @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
 */
public class RELAXCoreFactoryImpl extends FactoryImpl
{
    protected Grammar parse( InputSource is, GrammarReaderController controller ) {
        return RELAXCoreReader.parse(is,factory,controller,new ExpressionPool());
    }

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