Examples of org.drools.lang.Expander

org.drools.lang.Expander
Expanders are extension points for expanding expressions in DRL at parse time. This is just-in-time translation, or macro expansion, or whatever you want. The important thing is that it happens at the last possible moment, so any errors in expansion are included in the parsers errors. Just-in-time expansions may include complex pre-compilers, or just macros, and everything in between. Expanders should ideally not make presumptions on any embedded semantic language. For instance, java aware pre processing should be done in drools-java semantic module, not in the parser itself. Expanders should be reusable across semantic languages.

    public PackageDescr parse(boolean isEditor,
                              final String source,
                              final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver( dsl );


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            this.results.addAll( expander.getErrors() );
        }
        return this.parse( isEditor,
                           expanded );
    }

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     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final DefaultExpanderResolver resolver) throws DroolsParserException {


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            String err = "";
            for ( ExpanderException ex : expander.getErrors() ) {
                err = err + "\n Line:[" + ex.getLine() + "] " + ex.getMessage();


            }
            throw new DroolsParserException( err );
        }

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    public PackageDescr parse(boolean isEditor,
                              final String source,
                              final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver( dsl );


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            this.results.addAll( expander.getErrors() );
        }
        return this.parse( isEditor,
                           expanded );
    }

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     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final DefaultExpanderResolver resolver) throws DroolsParserException {


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            String err = "";
            for ( Iterator iter = expander.getErrors().iterator(); iter.hasNext(); ) {
                ExpanderException ex = (ExpanderException) iter.next();
                err = err + "\n Line:[" + ex.getLine() + "] " + ex.getMessage();


            }
            throw new DroolsParserException( err );

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Related Classes of org.drools.lang.Expander

org.drools.compiler.DrlParser

org.drools.compiler.DrlParserTest

org.drools.contrib.DroolsCompilerAntTask

org.drools.integrationtests.DslTest

org.drools.lang.dsl.DefaultExpanderResolver

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