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

Example 21 with BindingDescr

use of org.drools.compiler.lang.descr.BindingDescr 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 22 with BindingDescr

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

the class PatternBuilder method buildCcdDescr.

protected Constraint buildCcdDescr(RuleBuildContext context, PatternDescr patternDescr, Pattern pattern, BaseDescr d, ConstraintConnectiveDescr ccd, MVELDumper.MVELDumperContext mvelCtx) {
    d.copyLocation(patternDescr);
    mvelCtx.clear();
    String expr = context.getCompilerFactory().getExpressionProcessor().dump(d, ccd, mvelCtx);
    Map<String, OperatorDescr> aliases = mvelCtx.getAliases();
    // create bindings
    TypeDeclaration typeDeclaration = getTypeDeclaration(pattern, context);
    for (BindingDescr bind : mvelCtx.getBindings()) {
        buildRuleBindings(context, patternDescr, pattern, bind, typeDeclaration);
    }
    if (expr.length() == 0) {
        return null;
    }
    // check if it is an atomic expression
    Constraint constraint = processAtomicExpression(context, pattern, d, expr, aliases);
    // otherwise check if it is a simple expression
    return constraint != null ? constraint : buildExpression(context, pattern, d, expr, aliases);
}

Example 23 with BindingDescr

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

the class PatternBuilder method createDeclarationObject.

protected static Declaration createDeclarationObject(final RuleBuildContext context, final String identifier, final String expr, final Pattern pattern) {
    final BindingDescr implicitBinding = new BindingDescr(identifier, expr);
    final Declaration declaration = new Declaration(identifier, null, pattern, true);
    InternalReadAccessor extractor = getFieldReadAccessor(context, implicitBinding, pattern, implicitBinding.getExpression(), declaration, false);
    if (extractor == null) {
        return null;
    }
    declaration.setReadAccessor(extractor);
    return declaration;
}

Example 24 with BindingDescr

use of org.drools.compiler.lang.descr.BindingDescr 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 25 with BindingDescr

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

the class PatternBuilder method processPositional.

protected void processPositional(final RuleBuildContext context, final PatternDescr patternDescr, final Pattern pattern, final ExprConstraintDescr descr) {
    if (descr.getType() == ExprConstraintDescr.Type.POSITIONAL && pattern.getObjectType() instanceof ClassObjectType) {
        Class<?> klazz = ((ClassObjectType) pattern.getObjectType()).getClassType();
        TypeDeclaration tDecl = context.getKnowledgeBuilder().getTypeDeclaration(klazz);
        if (tDecl == null) {
            registerDescrBuildError(context, patternDescr, "Unable to find @positional definitions for :" + klazz + "\n");
            return;
        }
        ClassDefinition clsDef = tDecl.getTypeClassDef();
        if (clsDef == null) {
            registerDescrBuildError(context, patternDescr, "Unable to find @positional field " + descr.getPosition() + " for class " + tDecl.getTypeName() + "\n");
            return;
        }
        FieldDefinition field = clsDef.getField(descr.getPosition());
        if (field == null) {
            registerDescrBuildError(context, patternDescr, "Unable to find @positional field " + descr.getPosition() + " for class " + tDecl.getTypeName() + "\n");
            return;
        }
        String expr = descr.getExpression();
        boolean isSimpleIdentifier = isIdentifier(expr);
        if (isSimpleIdentifier) {
            // create a binding
            BindingDescr binder = new BindingDescr();
            binder.setUnification(true);
            binder.setExpression(field.getName());
            binder.setVariable(descr.getExpression());
            buildRuleBindings(context, patternDescr, pattern, binder);
        } else {
            // create a constraint
            build(context, patternDescr, pattern, descr, field.getName() + " == " + descr.getExpression());
        }
    }
}