Package org.drools.lang.descr

Examples of org.drools.lang.descr.FromDescr

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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "test_SimpleAccessorWithFrom.drl" );
        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final MVELExprDescr accessor = (MVELExprDescr) from.getDataSource();

        assertEquals( "something.doIt",
                      accessor.getExpression() );
    }
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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "test_SimpleAccessorArgWithFrom.drl" );
        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final MVELExprDescr accessor = (MVELExprDescr) from.getDataSource();

        assertEquals( "something.doIt[\"key\"]",
                      accessor.getExpression() );
    }
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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "test_ComplexChainedCallWithFrom.drl" );
        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final MVELExprDescr accessor = (MVELExprDescr) from.getDataSource();

        assertEquals( "doIt1( foo,bar,42,\"hello\",[ a : \"b\"], [a, \"b\", 42] ).doIt2(bar, [a, \"b\", 42]).field[\"key\"]",
                          accessor.getExpression() );
    }
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    }

    public RuleConditionElement build(final RuleBuildContext context,
                                      final BaseDescr descr,
                                      final Pattern prefixPattern) {
        final FromDescr fromDescr = (FromDescr) descr;

        final MVELExprDescr expr = (MVELExprDescr) fromDescr.getDataSource();
        From from = null;
        try {
            // This builder is re-usable in other dialects, so specify by name
            MVELDialect dialect = (MVELDialect) context.getDialect( "mvel" );
           
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                        final String localName,
                        final Attributes attrs,
                        final ExtensibleXmlParser parser) throws SAXException {
        parser.startElementBuilder( localName,
                                    attrs );
        final FromDescr fromDesctiptor = new FromDescr();
        return fromDesctiptor;
    }
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    public Object end(final String uri,
                      final String localName,
                      final ExtensibleXmlParser parser) throws SAXException {
        final Element element = parser.endElementBuilder();

        final FromDescr fromDescr = (FromDescr) parser.getCurrent();

        Object parent = parser.getParent();

        final PatternDescr patternDescr = (PatternDescr) parent;
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        final String expression =((org.w3c.dom.Text)element.getChildNodes().item( 0 )).getWholeText() + ";";
       
        emptyContentCheck( localName, expression, parser );

        FromDescr parent = (FromDescr) parser.getParent();

        final CharStream charStream = new ANTLRStringStream( expression.trim() );
        final DRLLexer lexer = new DRLLexer( charStream );
        final TokenStream tokenStream = new CommonTokenStream( lexer );
        final DRLParser drlParser = new DRLParser( tokenStream );
        drlParser.setTreeAdaptor(new DroolsTreeAdaptor());

        try {
          Tree fromSourceTree = (Tree) drlParser.from_source().getTree();
          if (!drlParser.hasErrors()){
        CommonTreeNodeStream nodes = new CommonTreeNodeStream(fromSourceTree);
        nodes.setTokenStream(tokenStream);
              DescrBuilderTree walker = new DescrBuilderTree(nodes);
              from_source_clause_return fromReturn = walker.from_source_clause();
              parent.setDataSource(fromReturn.retAccessorDescr);
              parent = fromReturn.fromDescr;
          } else {
                throw new SAXParseException( "<" + localName + "> must have a valid expression content ",
                        parser.getLocator() );           
          }
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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "rule",
                                                          "test_SimpleMethodCallWithFrom.drl" );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final AccessorDescr method = (AccessorDescr) from.getDataSource();

        assertEquals( "something.doIt( foo,bar,42,\"hello\",{ a => \"b\", \"something\" => 42, \"a\" => foo, x => {x=>y}},\"end\", [a, \"b\", 42] )",
                      method.toString() );
    }
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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "rule",
                                                          "test_SimpleFunctionCallWithFrom.drl" );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final AccessorDescr func = (AccessorDescr) from.getDataSource();

        assertEquals( "doIt( foo,bar,42,\"hello\",{ a => \"b\", \"something\" => 42, \"a\" => foo, x => {x=>y}},\"end\", [a, \"b\", 42] )",
                      func.toString() );
    }
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        final RuleDescr rule = (RuleDescr) parseResource( "rule",
                                                          "rule",
                                                          "test_SimpleAccessorWithFrom.drl" );
        final PatternDescr pattern = (PatternDescr) rule.getLhs().getDescrs().get( 0 );
        final FromDescr from = (FromDescr) pattern.getSource();
        final AccessorDescr accessor = (AccessorDescr) from.getDataSource();

        assertNull( ((FieldAccessDescr) accessor.getInvokers().get( 0 )).getArgument() );

        assertEquals( "something.doIt",
                      accessor.toString() );
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Related Classes of org.drools.lang.descr.FromDescr

  • org.drools.compiler.xml.rules.ExpressionHandler
  • org.drools.compiler.xml.rules.FromHandler
  • org.drools.compiler.xml.rules.XmlPackageReaderTest
  • org.drools.lang.api.impl.SourceDescrBuilderImpl
  • org.drools.lang.api.SourceDescrBuilderImpl
  • org.drools.lang.RuleParserTest
  • org.drools.rule.builder.dialect.mvel.MVELFromBuilder
  • org.drools.xml.ExpressionHandler
  • org.drools.xml.FromHandler
  • org.drools.xml.rules.ExpressionHandler
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