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

                                r.markSchemaAsDefined(r.currentSchema);
                            }
                        }
                    };
                }                
            }, new ExpressionPool());
        }

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    private static Grammar deserialize( InputStream is ) {
        try {
            ObjectInputStream ois = new ObjectInputStream( is );
            final Expression exp = (Expression)ois.readObject();
            final ExpressionPool pool = (ExpressionPool)ois.readObject();
            ois.close();
        
            return new Grammar() {
                public Expression getTopLevel() { return exp; }
                public ExpressionPool getPool() { return pool; }

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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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                return reader.getResult();
        }


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

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     */
    public void setPool( ExpressionPool pool ) {
        this.pool = pool;
    }
    public ExpressionPool getPool() {
        if( pool==null)        return new ExpressionPool();
        else                return pool;
    }

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        return reader.getResult();
    }


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

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    }
    
    public XMLSchemaReader(
        GrammarReaderController controller,
        SAXParserFactory parserFactory ) {
        this( controller, parserFactory, new ExpressionPool() );
    }

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    /** easy-to-use constructor. */
    public RELAXNGReader(
        GrammarReaderController controller,
        SAXParserFactory parserFactory) {
        // TODO: add s4s
        this(controller,parserFactory,new StateFactory(),new ExpressionPool());
    }

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    /** loads TREX pattern */
    public static TREXGrammar parse( String grammarURL,
        SAXParserFactory factory, GrammarReaderController controller )
    {
        TREXGrammarReader reader = new TREXGrammarReader(controller,factory,new ExpressionPool());
        reader.parse(grammarURL);
        
        return reader.getResult();
    }

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    /** loads TREX pattern */
    public static TREXGrammar parse( InputSource grammar,
        SAXParserFactory factory, GrammarReaderController controller )
    {
        TREXGrammarReader reader = new TREXGrammarReader(controller,factory,new ExpressionPool());
        reader.parse(grammar);
        
        return reader.getResult();
    }

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