Examples with FromDescr org.drools.drl.ast.descr.FromDescr used on opensource projects

Example 16 with FromDescr

use of org.drools.drl.ast.descr.FromDescr in project drools by kiegroup.

the class MVELFromBuilder method build.

public RuleConditionElement build(final RuleBuildContext context, final BaseDescr descr, final Pattern prefixPattern) {
    String text = ((FromDescr) descr).getExpression();
    Optional<EntryPointId> entryPointId = context.getEntryPointId(text);
    if (entryPointId.isPresent()) {
        return entryPointId.get();
    }
    // This builder is re-usable in other dialects, so specify by name
    MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
    boolean typeSafe = context.isTypesafe();
    if (!dialect.isStrictMode()) {
        context.setTypesafe(false);
    }
    try {
        Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
        AnalysisResult analysis = dialect.analyzeExpression(context, descr, text, new BoundIdentifiers(DeclarationScopeResolver.getDeclarationClasses(decls), context));
        if (analysis == null) {
            // something bad happened
            return null;
        }
        Class<?> returnType = ((MVELAnalysisResult) analysis).getReturnType();
        if (prefixPattern != null && !prefixPattern.isCompatibleWithFromReturnType(returnType)) {
            context.addError(new DescrBuildError(descr, context.getRuleDescr(), null, "Pattern of type: '" + prefixPattern.getObjectType() + "' on rule '" + context.getRuleDescr().getName() + "' is not compatible with type " + returnType.getCanonicalName() + " returned by source"));
            return null;
        }
        final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
        final Declaration[] declarations = new Declaration[usedIdentifiers.getDeclrClasses().size()];
        int j = 0;
        for (String str : usedIdentifiers.getDeclrClasses().keySet()) {
            declarations[j++] = decls.get(str);
        }
        Arrays.sort(declarations, SortDeclarations.instance);
        MVELCompilationUnit unit = dialect.getMVELCompilationUnit(text, analysis, declarations, null, null, context, "drools", KnowledgeHelper.class, false, MVELCompilationUnit.Scope.CONSEQUENCE);
        MVELDataProvider dataProvider = new MVELDataProvider(unit, context.getDialect().getId());
        From from = new From(dataProvider);
        from.setResultPattern(prefixPattern);
        MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
        data.addCompileable(from, dataProvider);
        dataProvider.compile(data, context.getRule());
        return from;
    } catch (final Exception e) {
        AsmUtil.copyErrorLocation(e, descr);
        context.addError(new DescrBuildError(context.getParentDescr(), descr, null, "Unable to build expression for 'from' : " + e.getMessage() + " '" + text + "'"));
        return null;
    } finally {
        context.setTypesafe(typeSafe);
    }
}

Example 17 with FromDescr

use of org.drools.drl.ast.descr.FromDescr in project drools by kiegroup.

the class RuleParserTest method testFromWithInlineListMethod.

@Test
public void testFromWithInlineListMethod() throws Exception {
    String source = "rule XYZ \n" + " when \n" + " o: Order( ) \n" + " Number( ) from [1, 2, 3].sublist(1, 2) \n" + " then \n" + " System.err.println(\"Invalid customer id found!\"); \n" + " o.addError(\"Invalid customer id\"); \n" + "end \n";
    PackageDescr pkg = (PackageDescr) parse("compilationUnit", source);
    assertFalse(parser.getErrors().toString(), parser.hasErrors());
    RuleDescr rule = (RuleDescr) pkg.getRules().get(0);
    assertEquals("XYZ", rule.getName());
    assertFalse(parser.hasErrors());
    PatternDescr number = (PatternDescr) rule.getLhs().getDescrs().get(1);
    assertEquals("[1, 2, 3].sublist(1, 2)", ((FromDescr) number.getSource()).getDataSource().toString());
}

Example 18 with FromDescr

use of org.drools.drl.ast.descr.FromDescr in project drools by kiegroup.

the class RuleParserTest method testSimpleAccessorWithFrom.

@Test
public void testSimpleAccessorWithFrom() throws Exception {
    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());
}

Example 19 with FromDescr

use of org.drools.drl.ast.descr.FromDescr in project drools by kiegroup.

the class RuleParserTest method testComplexChainedAcessor.

@Test
public void testComplexChainedAcessor() throws Exception {
    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());
}

Example 20 with FromDescr

use of org.drools.drl.ast.descr.FromDescr in project drools by kiegroup.

the class RuleParserTest method testFromComplexAcessor.

@Test
public void testFromComplexAcessor() throws Exception {
    String source = "rule \"Invalid customer id\" ruleflow-group \"validate\" lock-on-active true \n" + " when \n" + "     o: Order( ) \n" + "     not( Customer( ) from customerService.getCustomer(o.getCustomerId()) ) \n" + " then \n" + "     System.err.println(\"Invalid customer id found!\"); \n" + "     o.addError(\"Invalid customer id\"); \n" + "end \n";
    PackageDescr pkg = (PackageDescr) parse("compilationUnit", source);
    assertFalse(parser.getErrorMessages().toString(), parser.hasErrors());
    RuleDescr rule = (RuleDescr) pkg.getRules().get(0);
    assertEquals("Invalid customer id", rule.getName());
    assertEquals(2, rule.getLhs().getDescrs().size());
    NotDescr not = (NotDescr) rule.getLhs().getDescrs().get(1);
    PatternDescr customer = (PatternDescr) not.getDescrs().get(0);
    assertEquals("Customer", customer.getObjectType());
    assertEquals("customerService.getCustomer(o.getCustomerId())", ((FromDescr) customer.getSource()).getDataSource().getText());
}