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

Example 16 with ConstraintConnectiveDescr

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

the class PatternBuilder method build.

private void build(RuleBuildContext context, PatternDescr patternDescr, Declaration xpathStartDeclaration, Pattern pattern, BaseDescr original, String expr) {
    ConstraintConnectiveDescr result = parseExpression(context, patternDescr, original, expr);
    if (result == null) {
        return;
    }
    result.copyLocation(original);
    DumperContext mvelCtx = new DumperContext().setRuleContext(context);
    List<Constraint> constraints = build(context, patternDescr, xpathStartDeclaration, pattern, result, mvelCtx);
    pattern.addConstraints(constraints);
}

Example 17 with ConstraintConnectiveDescr

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

the class PatternBuilder method processConstraintsAndBinds.

/**
 * Process all constraints and bindings on this pattern
 */
private void processConstraintsAndBinds(RuleBuildContext context, PatternDescr patternDescr, Declaration xpathStartDeclaration, Pattern pattern) {
    DumperContext mvelCtx = new DumperContext().setRuleContext(context);
    for (BaseDescr b : patternDescr.getDescrs()) {
        String expression;
        boolean isPositional = false;
        if (b instanceof BindingDescr) {
            BindingDescr bind = (BindingDescr) b;
            expression = bind.getVariable() + (bind.isUnification() ? " := " : " : ") + bind.getExpression();
        } else if (b instanceof ExprConstraintDescr) {
            ExprConstraintDescr descr = (ExprConstraintDescr) b;
            expression = descr.getExpression();
            isPositional = descr.getType() == ExprConstraintDescr.Type.POSITIONAL;
        } else {
            expression = b.getText();
        }
        ConstraintConnectiveDescr result = parseExpression(context, patternDescr, b, expression);
        if (result == null) {
            return;
        }
        result.setNegated(b.isNegated());
        isPositional &= !(result.getDescrs().size() == 1 && result.getDescrs().get(0) instanceof BindingDescr);
        if (isPositional) {
            processPositional(context, patternDescr, xpathStartDeclaration, pattern, (ExprConstraintDescr) b);
        } else {
            // need to build the actual constraint
            List<Constraint> constraints = build(context, patternDescr, xpathStartDeclaration, pattern, result, mvelCtx);
            pattern.addConstraints(constraints);
        }
    }
    TypeDeclaration typeDeclaration = getTypeDeclaration(pattern, context);
    if (typeDeclaration != null && typeDeclaration.isPropertyReactive()) {
        for (String field : lookAheadFieldsOfIdentifier(context.getRuleDescr(), patternDescr)) {
            addFieldToPatternWatchlist(pattern, typeDeclaration, field);
        }
    }
}

Example 18 with ConstraintConnectiveDescr

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

the class PatternBuilder method buildXPathDescr.

private Constraint buildXPathDescr(RuleBuildContext context, PatternDescr patternDescr, Declaration xpathStartDeclaration, Pattern pattern, ExpressionDescr descr, DumperContext mvelCtx) {
    String expression = descr.getExpression();
    XpathAnalysis xpathAnalysis = XpathAnalysis.analyze(expression);
    if (xpathAnalysis.hasError()) {
        registerDescrBuildError(context, patternDescr, "Invalid xpath expression '" + expression + "': " + xpathAnalysis.getError());
        return null;
    }
    XpathConstraint xpathConstraint = new XpathConstraint();
    ObjectType objectType = pattern.getObjectType();
    if (objectType.isTemplate()) {
        throw new UnsupportedOperationException("xpath is not supported with fact templates");
    }
    Class<?> patternClass = ((ClassObjectType) objectType).getClassType();
    List<Class<?>> backReferenceClasses = new ArrayList<>();
    backReferenceClasses.add(patternClass);
    XpathBackReference backRef = new XpathBackReference(pattern, backReferenceClasses);
    pattern.setBackRefDeclarations(backRef);
    ObjectType originalType = pattern.getObjectType();
    ObjectType currentObjectType = originalType;
    mvelCtx.setInXpath(true);
    try {
        // then the xpathoffset must be adjusted by -1, as pattern is not actually added to the rete network
        for (XpathAnalysis.XpathPart part : xpathAnalysis) {
            XpathConstraint.XpathChunk xpathChunk = xpathConstraint.addChunck(patternClass, part.getField(), part.getIndex(), part.isIterate(), part.isLazy());
            // make sure the Pattern is wired up to correct ClassObjectType and set as a target for rewiring
            context.getPkg().wireObjectType(currentObjectType, xpathChunk);
            if (xpathChunk == null) {
                registerDescrBuildError(context, patternDescr, "Invalid xpath expression '" + expression + "': cannot access " + part.getField() + " on " + patternClass);
                pattern.setObjectType(originalType);
                return null;
            }
            if (part.getInlineCast() != null) {
                try {
                    patternClass = context.getDialect().getTypeResolver().resolveType(part.getInlineCast());
                } catch (ClassNotFoundException e) {
                    registerDescrBuildError(context, patternDescr, "Unknown class " + part.getInlineCast() + " in xpath expression '" + expression + "'");
                    return null;
                }
                part.addInlineCastConstraint(patternClass);
                currentObjectType = getObjectType(context, patternDescr, patternClass.getName());
                xpathChunk.setReturnedType(currentObjectType);
            } else {
                patternClass = xpathChunk.getReturnedClass();
                currentObjectType = getObjectType(context, patternDescr, patternClass.getName());
            }
            context.increaseXpathChuckNr();
            pattern.setObjectType(currentObjectType);
            backReferenceClasses.add(0, patternClass);
            backRef.reset();
            for (String constraint : part.getConstraints()) {
                ConstraintConnectiveDescr result = parseExpression(context, patternDescr, new ExprConstraintDescr(constraint), constraint);
                if (result == null) {
                    continue;
                }
                // preserving this, as the recursive build() resets it
                int chunkNbr = context.getXpathChuckNr();
                for (Constraint c : build(context, patternDescr, xpathStartDeclaration, pattern, result, mvelCtx)) {
                    xpathChunk.addConstraint(c);
                }
                context.setXpathChuckNr(chunkNbr);
            }
        }
        xpathConstraint.setXpathStartDeclaration(xpathStartDeclaration);
        if (descr instanceof BindingDescr) {
            Declaration pathDeclr = pattern.addDeclaration(((BindingDescr) descr).getVariable());
            pathDeclr.setxPathOffset(context.getXpathChuckNr());
            xpathConstraint.setDeclaration(pathDeclr);
        }
    } finally {
        mvelCtx.setInXpath(false);
        pattern.setBackRefDeclarations(null);
        pattern.setObjectType(originalType);
        context.resetXpathChuckNr();
    }
    return xpathConstraint;
}

Example 19 with ConstraintConnectiveDescr

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

the class QueryElementBuilder method parseExpression.

private ConstraintConnectiveDescr parseExpression(final RuleBuildContext context, final PatternDescr patternDescr, final String expression) {
    DrlExprParser parser = new DrlExprParser(context.getConfiguration().getLanguageLevel());
    ConstraintConnectiveDescr result = parser.parse(expression);
    if (result == null || parser.hasErrors()) {
        for (DroolsParserException error : parser.getErrors()) {
            context.addError(new DescrBuildError(context.getParentDescr(), patternDescr, null, "Unable to parser pattern expression:\n" + error.getMessage()));
        }
        return null;
    }
    return result;
}

Example 20 with ConstraintConnectiveDescr

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

the class DescrDumper method processConnectiveDescr.

protected void processConnectiveDescr(StringBuilder sbuilder, BaseDescr base, int parentPriority, boolean isInsideRelCons, DumperContext context) {
    ConstraintConnectiveDescr ccd = (ConstraintConnectiveDescr) base;
    boolean wrapParenthesis = parentPriority > ccd.getConnective().getPrecedence();
    if (wrapParenthesis) {
        sbuilder.append("( ");
    }
    boolean first = true;
    List<BaseDescr> descrs = new ArrayList<>(ccd.getDescrs());
    for (BaseDescr constr : descrs) {
        if (!(constr instanceof BindingDescr)) {
            if (first) {
                first = false;
            } else {
                sbuilder.append(" ");
                sbuilder.append(ccd.getConnective().toString());
                sbuilder.append(" ");
            }
        }
        context.incOpenCcd();
        dump(sbuilder, constr, ccd, ccd.getDescrs().indexOf(constr), ccd.getConnective().getPrecedence(), isInsideRelCons, context);
        context.decOpenCcd();
    }
    if (first) {
        // means all children were actually only bindings, replace by just true
        sbuilder.append("true");
    }
    if (wrapParenthesis) {
        sbuilder.append(" )");
    }
}