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

Example 11 with FromDescr

use of org.drools.drl.ast.descr.FromDescr 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 12 with FromDescr

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

the class PatternBuilder method isPassThroughPattern.

private static boolean isPassThroughPattern(PatternDescr pattern, String identifier) {
    // We should add properties in the 2nd pattern to create a correct property reactivity mask.
    if (pattern.getSource() instanceof FromDescr) {
        FromDescr from = (FromDescr) pattern.getSource();
        String expr = from.getExpression().trim();
        if (identifier.equals(expr)) {
            return true;
        }
    }
    return false;
}

Example 13 with FromDescr

use of org.drools.drl.ast.descr.FromDescr 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 14 with FromDescr

use of org.drools.drl.ast.descr.FromDescr 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 15 with FromDescr

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

the class AccumulateInline method parseAccumulatePattern.

void parseAccumulatePattern() {
    PatternDescr pattern = accumulateDescr.getInputPattern();
    if (pattern == null || pattern.getSource() == null) {
        return;
    }
    PatternSourceDescr sourceDescr = pattern.getSource();
    if (sourceDescr instanceof FromDescr) {
        DeclarativeInvokerDescr invokerDescr = ((FromDescr) sourceDescr).getDataSource();
        String mvelBlock = addCurlyBracesToBlock(addSemicolon(invokerDescr.getText()));
        CompiledBlockResult fromCodeCompilationResult = mvelCompiler.compileStatement(mvelBlock);
        BlockStmt fromBlock = fromCodeCompilationResult.statementResults();
        for (Statement stmt : fromBlock.getStatements()) {
            stmt.findAll(NameExpr.class).stream().map(Node::toString).filter(context::hasDeclaration).forEach(usedExternalDeclarations::add);
        }
    }
}