Examples with ConstraintConnectiveDescr org.drools.compiler.lang.descr.ConstraintConnectiveDescr used on opensource projects

Example 31 with ConstraintConnectiveDescr

use of org.drools.compiler.lang.descr.ConstraintConnectiveDescr in project drools by kiegroup.

the class PatternBuilder method buildXPathDescr.

private Constraint buildXPathDescr(RuleBuildContext context, PatternDescr patternDescr, Pattern pattern, BaseDescr descr, MVELDumper.MVELDumperContext mvelCtx) {
    String expression = ((ExpressionDescr) 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();
    Class<?> patternClass = objectType.getClassType();
    List<Class<?>> backReferenceClasses = new ArrayList<Class<?>>();
    backReferenceClasses.add(patternClass);
    XpathBackReference backRef = new XpathBackReference(pattern, backReferenceClasses);
    pattern.setBackRefDeclarations(backRef);
    ObjectType originalType = pattern.getObjectType();
    ObjectType currentObjectType = originalType;
    mvelCtx.setInXpath(true);
    try {
        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().getClassFieldAccessorStore().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());
            }
            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;
                }
                for (Constraint c : build(context, patternDescr, pattern, result, mvelCtx)) {
                    xpathChunk.addConstraint(c);
                }
            }
        }
    } finally {
        mvelCtx.setInXpath(false);
        pattern.setBackRefDeclarations(null);
        pattern.setObjectType(originalType);
    }
    xpathConstraint.setXpathStartDeclaration(patternDescr.getXpathStartDeclaration());
    if (descr instanceof BindingDescr) {
        xpathConstraint.setDeclaration(pattern.addDeclaration(((BindingDescr) descr).getVariable()));
    }
    return xpathConstraint;
}

Example 32 with ConstraintConnectiveDescr

use of org.drools.compiler.lang.descr.ConstraintConnectiveDescr in project drools by kiegroup.

the class PatternBuilder method processConstraintsAndBinds.

/**
 * Process all constraints and bindings on this pattern
 */
protected void processConstraintsAndBinds(final RuleBuildContext context, final PatternDescr patternDescr, final Pattern pattern) {
    MVELDumper.MVELDumperContext mvelCtx = new MVELDumper.MVELDumperContext().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;
        }
        isPositional &= !(result.getDescrs().size() == 1 && result.getDescrs().get(0) instanceof BindingDescr);
        if (isPositional) {
            processPositional(context, patternDescr, pattern, (ExprConstraintDescr) b);
        } else {
            // need to build the actual constraint
            List<Constraint> constraints = build(context, patternDescr, pattern, result, mvelCtx);
            pattern.addConstraints(constraints);
        }
    }
    TypeDeclaration typeDeclaration = getTypeDeclaration(pattern, context);
    if (typeDeclaration != null && typeDeclaration.isPropertyReactive()) {
        for (String field : context.getRuleDescr().lookAheadFieldsOfIdentifier(patternDescr)) {
            addFieldToPatternWatchlist(pattern, typeDeclaration, field);
        }
    }
    combineConstraints(context, pattern, mvelCtx);
}

Example 33 with ConstraintConnectiveDescr

use of org.drools.compiler.lang.descr.ConstraintConnectiveDescr in project drools by kiegroup.

the class PatternBuilder method parseExpression.

protected ConstraintConnectiveDescr parseExpression(final RuleBuildContext context, final PatternDescr patternDescr, final BaseDescr original, final String expression) {
    DrlExprParser parser = new DrlExprParser(context.getConfiguration().getLanguageLevel());
    ConstraintConnectiveDescr result = parser.parse(expression);
    result.setResource(patternDescr.getResource());
    if (result == null) {
        registerDescrBuildError(context, patternDescr, "Unable to parse pattern expression:\n" + expression);
        return null;
    }
    result.copyLocation(original);
    if (parser.hasErrors()) {
        for (DroolsParserException error : parser.getErrors()) {
            registerDescrBuildError(context, patternDescr, "Unable to parse pattern expression:\n" + error.getMessage());
        }
        return null;
    }
    return result;
}

Example 34 with ConstraintConnectiveDescr

use of org.drools.compiler.lang.descr.ConstraintConnectiveDescr in project drools by kiegroup.

the class PatternBuilder method build.

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

Example 35 with ConstraintConnectiveDescr

use of org.drools.compiler.lang.descr.ConstraintConnectiveDescr in project drools by kiegroup.

the class DRL6Expressions method exclusiveOrExpression.

// $ANTLR end "inclusiveOrExpression"
// $ANTLR start "exclusiveOrExpression"
// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:273:1: exclusiveOrExpression returns [BaseDescr result] : left= andExpression ( XOR right= andExpression )* ;
public final BaseDescr exclusiveOrExpression() throws RecognitionException {
    BaseDescr result = null;
    BaseDescr left = null;
    BaseDescr right = null;
    try {
        // src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:274:3: (left= andExpression ( XOR right= andExpression )* )
        // src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:274:5: left= andExpression ( XOR right= andExpression )*
        {
            pushFollow(FOLLOW_andExpression_in_exclusiveOrExpression1383);
            left = andExpression();
            state._fsp--;
            if (state.failed)
                return result;
            if (state.backtracking == 0) {
                if (buildDescr) {
                    result = left;
                }
            }
            // src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:275:3: ( XOR right= andExpression )*
            loop29: while (true) {
                int alt29 = 2;
                int LA29_0 = input.LA(1);
                if ((LA29_0 == XOR)) {
                    alt29 = 1;
                }
                switch(alt29) {
                    case 1:
                        // src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:275:5: XOR right= andExpression
                        {
                            match(input, XOR, FOLLOW_XOR_in_exclusiveOrExpression1391);
                            if (state.failed)
                                return result;
                            pushFollow(FOLLOW_andExpression_in_exclusiveOrExpression1395);
                            right = andExpression();
                            state._fsp--;
                            if (state.failed)
                                return result;
                            if (state.backtracking == 0) {
                                if (buildDescr) {
                                    ConstraintConnectiveDescr descr = ConstraintConnectiveDescr.newXor();
                                    descr.addOrMerge(result);
                                    descr.addOrMerge(right);
                                    result = descr;
                                }
                            }
                        }
                        break;
                    default:
                        break loop29;
                }
            }
        }
    } catch (RecognitionException re) {
        throw re;
    } finally {
    // do for sure before leaving
    }
    return result;
}