Examples of org.drools.lang.dsl.DefaultExpanderResolver

org.drools.lang.dsl.DefaultExpanderResolver
The default expander resolver will provide instances of the DefaultExpander. The DefaultExpander uses templates to provide DSL and pseudo natural language support.

     * @throws DroolsParserException
     */
    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() );
        }

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     * @throws DroolsParserException
     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver( dsl );
        return getExpandedDRL( source,
                               resolver );
    }

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    public Location getLocation() {
        return this.location;
    }


    public DefaultExpanderResolver getDefaultResolver(final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver;
        try {
            resolver = new DefaultExpanderResolver( dsl );
        } catch ( final IOException e ) {
            throw new DroolsParserException( "Error parsing the DSL.",
                                             e );
        }
        return resolver;

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    public void testExpandDRLUsingInjectedExpander() throws Exception {
        String dsl = "[condition]Something=Something()\n[then]another=another();";
        String drl = "rule 'foo' \n when \n Something \n then \n another \nend";
        
        
        DefaultExpanderResolver resolver = new DefaultExpanderResolver(new StringReader(dsl));
        
        
        final DSLMappingFile file = new DSLTokenizedMappingFile();
        if ( file.parseAndLoad( new StringReader(dsl) ) ) {
            final Expander expander = new DefaultExpander();
            expander.addDSLMapping( file.getMapping() );
            resolver.addExpander("*", expander);
        } else {
            throw new RuntimeDroolsException( "Error parsing and loading DSL file." + file.getErrors() );
        }


        DrlParser parser = new DrlParser();

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        return dir.list( filter );
    }


    private DefaultExpanderResolver resolveDSLFiles() throws IOException {


        DefaultExpanderResolver resolver = new DefaultExpanderResolver();
        final File dir = new File( this.srcdir.getAbsolutePath() );
        DSLMappingFile file = new DSLTokenizedMappingFile();


        FilenameFilter filter = new FilenameFilter() {
            public boolean accept(File dir,
                                  String name) {
                return name.endsWith( ".dsl" );
            }
        };


        String[] children = dir.list( filter );
        if ( children.length == 0 ) {
            throw new BuildException( "There are no DSL files for this directory:" + this.srcdir.getAbsolutePath() );
        }


        for ( int index = 0; index < children.length; index++ ) {
            if ( file.parseAndLoad( new StringReader( loadResource( children[index] ) ) ) ) {
                final Expander expander = new DefaultExpander();
                expander.addDSLMapping( file.getMapping() );
                resolver.addExpander( "*",
                                      expander );
            } else {
                throw new RuntimeDroolsException( "Error parsing and loading DSL file." + file.getErrors() );
            }
        }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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     * @throws DroolsParserException
     */
    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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     * @throws DroolsParserException
     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver(dsl);
        return getExpandedDRL(source,
                resolver);
    }

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Related Classes of org.drools.lang.dsl.DefaultExpanderResolver

org.drools.compiler.DrlParser

org.drools.compiler.DrlParserTest

org.drools.contrib.DroolsCompilerAntTask

org.drools.integrationtests.DslTest

org.drools.lang.Expander

org.drools.RuntimeDroolsException

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