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

Example 6 with MVELExprDescr

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

the class PatternBuilder method lookupObjectType.

private Declaration lookupObjectType(RuleBuildContext context, PatternDescr patternDescr) {
    List<? extends BaseDescr> descrs = patternDescr.getConstraint().getDescrs();
    if (descrs.size() != 1 || !(descrs.get(0) instanceof ExprConstraintDescr)) {
        return null;
    }
    ExprConstraintDescr descr = (ExprConstraintDescr) descrs.get(0);
    String expr = descr.getExpression();
    if (expr.charAt(0) != '/') {
        return null;
    }
    XpathAnalysis xpathAnalysis = XpathAnalysis.analyze(expr);
    if (xpathAnalysis.hasError()) {
        registerDescrBuildError(context, patternDescr, "Invalid xpath expression '" + expr + "': " + xpathAnalysis.getError());
        return null;
    }
    XpathPart firstXpathChunk = xpathAnalysis.getPart(0);
    String identifier = firstXpathChunk.getField();
    DeclarationScopeResolver resolver = context.getDeclarationResolver();
    if (resolver.hasDataSource(identifier)) {
        patternDescr.setObjectType(findObjectType(context, firstXpathChunk, identifier));
        FromDescr fromDescr = new FromDescr();
        fromDescr.setDataSource(new MVELExprDescr(identifier));
        patternDescr.setSource(fromDescr);
        patternDescr.removeAllConstraint();
        firstXpathChunk.getConstraints().forEach(s -> patternDescr.addConstraint(new ExprConstraintDescr(s)));
        if (!xpathAnalysis.isSinglePart()) {
            String xpathExpr = (patternDescr.getIdentifier() == null ? "" : patternDescr.getIdentifier() + " : ") + expr.substring(xpathAnalysis.getPart(1).getStart());
            patternDescr.addConstraint(new ExprConstraintDescr(xpathExpr));
            patternDescr.setIdentifier("$void$");
        }
    } else {
        Declaration declr = resolver.getDeclaration(identifier);
        if (declr == null) {
            registerDescrBuildError(context, patternDescr, "The identifier '" + identifier + "' is not in scope");
            return null;
        }
        patternDescr.setObjectType(declr.getExtractor().getExtractToClassName());
        expr = (patternDescr.getIdentifier() != null ? patternDescr.getIdentifier() + (patternDescr.isUnification() ? " := " : " : ") : "") + expr.substring(identifier.length() + 1);
        descr.setExpression(expr);
        return declr;
    }
    return null;
}

Example 7 with MVELExprDescr

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

the class PatternUtil method normalizeOOPathPattern.

public static PatternDescr normalizeOOPathPattern(PatternDescr pattern, RuleContext context) {
    String oopathExpr = pattern.getDescrs().get(0).getText();
    XpathAnalysis xpathAnalysis = XpathAnalysis.analyze(oopathExpr);
    XpathAnalysis.XpathPart firstPart = xpathAnalysis.getPart(0);
    PatternDescr normalizedPattern = new PatternDescr();
    normalizedPattern.setObjectType(findPatternType(firstPart, context));
    firstPart.getConstraints().stream().map(ExprConstraintDescr::new).forEach(normalizedPattern::addConstraint);
    if (xpathAnalysis.getParts().size() == 1) {
        normalizedPattern.setIdentifier(pattern.getIdentifier());
    } else {
        StringBuilder sb = new StringBuilder();
        if (pattern.getIdentifier() != null) {
            sb.append(pattern.getIdentifier()).append(": ");
        }
        for (int i = 1; i < xpathAnalysis.getParts().size(); i++) {
            sb.append("/").append(xpathAnalysis.getPart(i));
        }
        normalizedPattern.addConstraint(new ExprConstraintDescr(sb.toString()));
    }
    FromDescr source = new FromDescr();
    source.setDataSource(new MVELExprDescr(firstPart.getField()));
    normalizedPattern.setSource(source);
    return normalizedPattern;
}

Example 8 with MVELExprDescr

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

the class SourceDescrBuilderImpl method expression.

public P expression(String expression) {
    FromDescr from = new FromDescr();
    from.setDataSource(new MVELExprDescr(expression));
    from.setResource(descr.getResource());
    descr.setSource(from);
    return parent;
}

Example 9 with MVELExprDescr

use of org.drools.drl.ast.descr.MVELExprDescr 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 10 with MVELExprDescr

use of org.drools.drl.ast.descr.MVELExprDescr 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());
}