org.drools.compiler.rule.builder.PatternBuilder Maven / Gradle / Ivy
/*
* Copyright 2006 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.compiler.rule.builder;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import org.drools.compiler.builder.impl.KnowledgeBuilderImpl;
import org.drools.compiler.compiler.AnalysisResult;
import org.drools.compiler.compiler.BoundIdentifiers;
import org.drools.compiler.compiler.DescrBuildError;
import org.drools.compiler.compiler.Dialect;
import org.drools.compiler.compiler.DrlExprParser;
import org.drools.compiler.compiler.DroolsErrorWrapper;
import org.drools.compiler.compiler.DroolsParserException;
import org.drools.compiler.compiler.DroolsWarningWrapper;
import org.drools.compiler.compiler.PackageRegistry;
import org.drools.compiler.lang.MVELDumper;
import org.drools.compiler.lang.descr.AnnotationDescr;
import org.drools.compiler.lang.descr.AtomicExprDescr;
import org.drools.compiler.lang.descr.BaseDescr;
import org.drools.compiler.lang.descr.BehaviorDescr;
import org.drools.compiler.lang.descr.BindingDescr;
import org.drools.compiler.lang.descr.ConnectiveType;
import org.drools.compiler.lang.descr.ConstraintConnectiveDescr;
import org.drools.compiler.lang.descr.ExprConstraintDescr;
import org.drools.compiler.lang.descr.ExpressionDescr;
import org.drools.compiler.lang.descr.FromDescr;
import org.drools.compiler.lang.descr.LiteralRestrictionDescr;
import org.drools.compiler.lang.descr.MVELExprDescr;
import org.drools.compiler.lang.descr.OperatorDescr;
import org.drools.compiler.lang.descr.PatternDescr;
import org.drools.compiler.lang.descr.PredicateDescr;
import org.drools.compiler.lang.descr.RelationalExprDescr;
import org.drools.compiler.lang.descr.ReturnValueRestrictionDescr;
import org.drools.compiler.rule.builder.XpathAnalysis.XpathPart;
import org.drools.compiler.rule.builder.dialect.DialectUtil;
import org.drools.compiler.rule.builder.dialect.java.JavaDialect;
import org.drools.compiler.rule.builder.dialect.mvel.MVELAnalysisResult;
import org.drools.compiler.rule.builder.dialect.mvel.MVELDialect;
import org.drools.core.base.ClassFieldReader;
import org.drools.core.base.ClassObjectType;
import org.drools.core.base.EvaluatorWrapper;
import org.drools.core.base.TypeResolver;
import org.drools.core.base.ValueType;
import org.drools.core.base.evaluators.EvaluatorDefinition.Target;
import org.drools.core.base.evaluators.IsAEvaluatorDefinition;
import org.drools.core.base.mvel.ActivationPropertyHandler;
import org.drools.core.base.mvel.MVELCompilationUnit;
import org.drools.core.base.mvel.MVELCompilationUnit.PropertyHandlerFactoryFixer;
import org.drools.core.base.mvel.MVELCompileable;
import org.drools.core.definitions.InternalKnowledgePackage;
import org.drools.core.definitions.rule.impl.RuleImpl;
import org.drools.core.factmodel.AnnotationDefinition;
import org.drools.core.factmodel.ClassDefinition;
import org.drools.core.factmodel.FieldDefinition;
import org.drools.core.factmodel.traits.TraitableBean;
import org.drools.core.facttemplates.FactTemplate;
import org.drools.core.facttemplates.FactTemplateFieldExtractor;
import org.drools.core.facttemplates.FactTemplateObjectType;
import org.drools.core.reteoo.RuleTerminalNode.SortDeclarations;
import org.drools.core.reteoo.RuleTerminalNodeLeftTuple;
import org.drools.core.rule.Behavior;
import org.drools.core.rule.Declaration;
import org.drools.core.rule.MVELDialectRuntimeData;
import org.drools.core.rule.Pattern;
import org.drools.core.rule.PatternSource;
import org.drools.core.rule.PredicateConstraint;
import org.drools.core.rule.QueryImpl;
import org.drools.core.rule.RuleConditionElement;
import org.drools.core.rule.SlidingLengthWindow;
import org.drools.core.rule.SlidingTimeWindow;
import org.drools.core.rule.TypeDeclaration;
import org.drools.core.rule.XpathBackReference;
import org.drools.core.rule.constraint.EvaluatorConstraint;
import org.drools.core.rule.constraint.MvelConstraint;
import org.drools.core.rule.constraint.NegConstraint;
import org.drools.core.rule.constraint.XpathConstraint;
import org.drools.core.spi.AcceptsClassObjectType;
import org.drools.core.spi.AcceptsReadAccessor;
import org.drools.core.spi.Constraint;
import org.drools.core.spi.Evaluator;
import org.drools.core.spi.FieldValue;
import org.drools.core.spi.InternalReadAccessor;
import org.drools.core.spi.ObjectType;
import org.drools.core.time.TimeUtils;
import org.drools.core.util.ClassUtils;
import org.drools.core.util.MVELSafeHelper;
import org.drools.core.util.StringUtils;
import org.drools.core.util.index.IndexUtil;
import org.kie.api.definition.rule.Watch;
import org.kie.api.definition.type.Role;
import org.kie.internal.builder.KnowledgeBuilderResult;
import org.kie.internal.builder.ResultSeverity;
import org.mvel2.MVEL;
import org.mvel2.ParserConfiguration;
import org.mvel2.ParserContext;
import org.mvel2.integration.PropertyHandler;
import org.mvel2.integration.PropertyHandlerFactory;
import org.mvel2.util.PropertyTools;
import static org.drools.compiler.rule.builder.MVELConstraintBuilder.*;
import static org.drools.core.util.StringUtils.isIdentifier;
/**
* A builder for patterns
*/
public class PatternBuilder
implements
RuleConditionBuilder {
private static final java.util.regex.Pattern evalRegexp = java.util.regex.Pattern.compile( "^eval\\s*\\(",
java.util.regex.Pattern.MULTILINE );
private static final java.util.regex.Pattern identifierRegexp = java.util.regex.Pattern.compile( "([\\p{L}_$][\\p{L}\\p{N}_$]*)" );
private static final java.util.regex.Pattern getterRegexp = java.util.regex.Pattern.compile( "get([\\p{L}_][\\p{L}\\p{N}_]*)\\(\\s*\\)" );
public PatternBuilder() {
}
public RuleConditionElement build( RuleBuildContext context,
PatternDescr descr ) {
boolean typeSafe = context.isTypesafe();
try {
return this.build( context,
descr,
null );
} finally {
context.setTypesafe( typeSafe );
}
}
/**
* Build a pattern for the given descriptor in the current
* context and using the given utils object
*/
public RuleConditionElement build( RuleBuildContext context,
PatternDescr patternDescr,
Pattern prefixPattern ) {
if ( patternDescr.getObjectType() == null ) {
lookupObjectType( context, patternDescr );
}
if ( patternDescr.getObjectType() == null || patternDescr.getObjectType().equals( "" ) ) {
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"ObjectType not correctly defined"));
return null;
}
ObjectType objectType = getObjectType(context, patternDescr);
if ( objectType == null ) { // if the objectType doesn't exist it has to be query
return buildQuery( context, patternDescr, patternDescr );
}
Pattern pattern = buildPattern( context, patternDescr, objectType );
processClassObjectType( context, objectType, pattern );
processAnnotations( context, patternDescr, pattern );
processSource( context, patternDescr, pattern );
processConstraintsAndBinds( context, patternDescr, pattern );
processBehaviors( context, patternDescr, pattern );
if ( !pattern.hasNegativeConstraint() && "on".equals( System.getProperty("drools.negatable") ) ) {
// this is a non-negative pattern, so we must inject the constraint
pattern.addConstraint( new NegConstraint(false) );
}
// poping the pattern
context.getDeclarationResolver().popBuildStack();
return pattern;
}
private void lookupObjectType( RuleBuildContext context, PatternDescr patternDescr ) {
List descrs = patternDescr.getConstraint().getDescrs();
if (descrs.size() != 1 || !(descrs.get(0) instanceof ExprConstraintDescr)) {
return;
}
ExprConstraintDescr descr = (ExprConstraintDescr)descrs.get(0);
String expr = descr.getExpression();
if (expr.charAt( 0 ) != '/') {
return;
}
XpathAnalysis xpathAnalysis = XpathAnalysis.analyze(expr);
if (xpathAnalysis.hasError()) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"Invalid xpath expression '" + expr + "': " + xpathAnalysis.getError()));
return;
}
XpathPart firstXpathChunk = xpathAnalysis.getPart( 0 );
String identifier = firstXpathChunk.getField();
Declaration declr = context.getDeclarationResolver().getDeclaration( identifier );
if (declr != null) {
patternDescr.setXpathStartDeclaration( declr );
patternDescr.setObjectType( declr.getExtractor().getExtractToClassName() );
expr = patternDescr.getIdentifier() + ( patternDescr.isUnification() ? " := " : " : " ) + expr.substring( identifier.length() + 1 );
descr.setExpression( expr );
} else {
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()) {
patternDescr.addConstraint( new ExprConstraintDescr( patternDescr.getIdentifier() + " : " + expr.substring( xpathAnalysis.getPart( 1 ).getStart() ) ) );
patternDescr.setIdentifier( "$void$" );
}
}
}
private String findObjectType( RuleBuildContext context, XpathPart firstXpathChunk, String identifier ) {
if ( firstXpathChunk.getInlineCast() != null ) {
return firstXpathChunk.getInlineCast();
}
return context.getPkg().getRuleUnitRegistry()
.getRuleUnitFor( context.getRule() )
.flatMap( ruDescr -> ruDescr.getDatasourceType( identifier ) )
.map( Class::getCanonicalName )
.orElse( null );
}
private Pattern buildPattern( RuleBuildContext context, PatternDescr patternDescr, ObjectType objectType ) {
String patternIdentifier = patternDescr.getIdentifier();
boolean duplicateBindings = patternIdentifier != null && objectType instanceof ClassObjectType &&
context.getDeclarationResolver().isDuplicated( context.getRule(),
patternIdentifier,
((ClassObjectType) objectType).getClassName() );
Pattern pattern;
if ( !StringUtils.isEmpty( patternIdentifier ) && !duplicateBindings ) {
pattern = new Pattern( context.getNextPatternId(),
0, // offset is 0 by default
objectType,
patternIdentifier,
patternDescr.isInternalFact(context) );
if ( objectType instanceof ClassObjectType ) {
// make sure PatternExtractor is wired up to correct ClassObjectType and set as a target for rewiring
context.getPkg().getClassFieldAccessorStore().getClassObjectType( ((ClassObjectType) objectType),
(AcceptsClassObjectType) pattern.getDeclaration().getExtractor() );
}
} else {
pattern = new Pattern( context.getNextPatternId(),
0, // offset is 0 by default
objectType,
null );
}
pattern.setPassive(patternDescr.isPassive(context));
if ( ClassObjectType.Match_ObjectType.isAssignableFrom( pattern.getObjectType() ) ) {
PropertyHandler handler = PropertyHandlerFactory.getPropertyHandler( RuleTerminalNodeLeftTuple.class );
if ( handler == null ) {
PropertyHandlerFactoryFixer.getPropertyHandlerClass().put( RuleTerminalNodeLeftTuple.class,
new ActivationPropertyHandler() );
}
}
// adding the newly created pattern to the build stack this is necessary in case of local declaration usage
context.getDeclarationResolver().pushOnBuildStack( pattern );
if ( duplicateBindings ) {
processDuplicateBindings( patternDescr.isUnification(), patternDescr, pattern, patternDescr, "this", patternDescr.getIdentifier(), context );
}
return pattern;
}
private void processClassObjectType( RuleBuildContext context, ObjectType objectType, Pattern pattern ) {
if ( objectType instanceof ClassObjectType ) {
// make sure the Pattern is wired up to correct ClassObjectType and set as a target for rewiring
context.getPkg().getClassFieldAccessorStore().getClassObjectType( ((ClassObjectType) objectType), pattern );
Class< ? > cls = ((ClassObjectType) objectType).getClassType();
if ( cls.getPackage() != null && !cls.getPackage().getName().equals( "java.lang" ) ) {
// register the class in its own package unless it is primitive or belongs to java.lang
TypeDeclaration typeDeclr = context.getKnowledgeBuilder().getAndRegisterTypeDeclaration( cls, cls.getPackage().getName() );
context.setTypesafe( typeDeclr == null || typeDeclr.isTypesafe() );
} else {
context.setTypesafe( true );
}
}
}
private ObjectType getObjectType(RuleBuildContext context, PatternDescr patternDescr) {
return getObjectType(context, patternDescr, patternDescr.getObjectType());
}
private ObjectType getObjectType(RuleBuildContext context, PatternDescr patternDescr, String objectType) {
final FactTemplate factTemplate = context.getPkg().getFactTemplate( objectType );
if ( factTemplate != null ) {
return new FactTemplateObjectType( factTemplate );
} else {
try {
final Class userProvidedClass = context.getDialect().getTypeResolver().resolveType( objectType );
if ( !Modifier.isPublic(userProvidedClass.getModifiers()) ) {
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"The class '" + objectType + "' is not public"));
return null;
}
return new ClassObjectType( userProvidedClass, isEvent(context, userProvidedClass) );
} catch ( final ClassNotFoundException e ) {
// swallow as we'll do another check in a moment and then record the problem
}
}
return null;
}
private boolean isEvent(RuleBuildContext context, Class userProvidedClass) {
TypeDeclaration typeDeclaration = getTypeDeclaration( context, userProvidedClass );
if (typeDeclaration != null) {
return typeDeclaration.getRole() == Role.Type.EVENT;
}
Role role = userProvidedClass.getAnnotation( Role.class );
return role != null && role.value() == Role.Type.EVENT;
}
private TypeDeclaration getTypeDeclaration( RuleBuildContext context, Class userProvidedClass ) {
String packageName = ClassUtils.getPackage( userProvidedClass );
KnowledgeBuilderImpl kbuilder = context.getKnowledgeBuilder();
PackageRegistry pkgr = kbuilder.getPackageRegistry( packageName );
TypeDeclaration typeDeclaration = pkgr != null ? pkgr.getPackage().getTypeDeclaration( userProvidedClass ) : null;
if (typeDeclaration == null && kbuilder.getKnowledgeBase() != null) {
// check if the type declaration is contained only in the already existing kbase (possible during incremental compilation)
InternalKnowledgePackage pkg = kbuilder.getKnowledgeBase().getPackage( packageName );
typeDeclaration = pkg != null ? pkg.getTypeDeclaration( userProvidedClass ) : null;
}
if (typeDeclaration == null) {
typeDeclaration = context.getPkg().getTypeDeclaration( userProvidedClass );
}
return typeDeclaration;
}
private void processSource( RuleBuildContext context, PatternDescr patternDescr, Pattern pattern ) {
if ( patternDescr.getSource() != null ) {
// we have a pattern source, so build it
RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( patternDescr.getSource().getClass() );
pattern.setSource( (PatternSource) builder.build( context, patternDescr.getSource(), pattern ) );
}
}
private void processBehaviors( RuleBuildContext context, PatternDescr patternDescr, Pattern pattern ) {
for ( BehaviorDescr behaviorDescr : patternDescr.getBehaviors() ) {
if ( pattern.getObjectType().isEvent() ) {
if ( Behavior.BehaviorType.TIME_WINDOW.matches( behaviorDescr.getSubType() ) ) {
SlidingTimeWindow window = new SlidingTimeWindow( TimeUtils.parseTimeString( behaviorDescr.getParameters().get( 0 ) ) );
pattern.addBehavior( window );
} else if ( Behavior.BehaviorType.LENGTH_WINDOW.matches( behaviorDescr.getSubType() ) ) {
SlidingLengthWindow window = new SlidingLengthWindow( Integer.valueOf( behaviorDescr.getParameters().get( 0 ) ) );
pattern.addBehavior( window );
}
context.setNeedStreamMode();
} else {
// Some behaviors can only be assigned to patterns declared as events
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"A Sliding Window can only be assigned to types declared with @role( event ). The type '" + pattern.getObjectType() + "' in '" + context.getRule().getName()
+ "' is not declared as an Event."));
}
}
}
private RuleConditionElement buildQuery( RuleBuildContext context, PatternDescr descr, PatternDescr patternDescr ) {
RuleConditionElement rce = null;
// it might be a recursive query, so check for same names
if ( context.getRule().getName().equals( patternDescr.getObjectType() ) ) {
// it's a query so delegate to the QueryElementBuilder
rce = buildQueryElement(context, descr, (QueryImpl) context.getRule());
}
if ( rce == null ) {
// look up the query in the current package
RuleImpl rule = context.getPkg().getRule( patternDescr.getObjectType() );
if ( rule instanceof QueryImpl ) {
// it's a query so delegate to the QueryElementBuilder
rce = buildQueryElement(context, descr, (QueryImpl) rule);
}
}
if ( rce == null ) {
// the query may have been imported, so try package imports
for ( String importName : context.getDialect().getTypeResolver().getImports() ) {
importName = importName.trim();
int pos = importName.indexOf( '*' );
if ( pos >= 0 ) {
String pkgName = importName.substring( 0,
pos - 1 );
PackageRegistry pkgReg = context.getKnowledgeBuilder().getPackageRegistry( pkgName );
if ( pkgReg != null ) {
RuleImpl rule = pkgReg.getPackage().getRule( patternDescr.getObjectType() );
if ( rule instanceof QueryImpl) {
// it's a query so delegate to the QueryElementBuilder
rce = buildQueryElement(context, descr, (QueryImpl) rule);
break;
}
}
}
}
}
if ( rce == null ) {
// this isn't a query either, so log an error
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"Unable to resolve ObjectType '" + patternDescr.getObjectType() + "'"));
}
return rce;
}
private RuleConditionElement buildQueryElement(RuleBuildContext context, BaseDescr descr, QueryImpl rule) {
if (context.getRule() != rule) {
context.getRule().addUsedQuery(rule);
}
return QueryElementBuilder.getInstance().build( context, descr, rule );
}
protected void processDuplicateBindings( boolean isUnification,
PatternDescr patternDescr,
Pattern pattern,
BaseDescr original,
String leftExpression,
String rightIdentifier,
RuleBuildContext context ) {
if ( isUnification ) {
// rewrite existing bindings into == constraints, so it unifies
build( context,
patternDescr,
pattern,
original,
leftExpression + " == " + rightIdentifier );
} else {
// This declaration already exists, so throw an Exception
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"Duplicate declaration for variable '" + rightIdentifier + "' in the rule '" + context.getRule().getName() + "'"));
}
}
protected void processAnnotations( final RuleBuildContext context,
final PatternDescr patternDescr,
final Pattern pattern ) {
processListenedPropertiesAnnotation( context, patternDescr, pattern );
processMetadataAnnotations( patternDescr, pattern, context.getDialect().getTypeResolver() );
}
protected void processMetadataAnnotations( PatternDescr patternDescr, Pattern pattern, TypeResolver typeResolver ) {
for ( AnnotationDescr ann : patternDescr.getAnnotations() ) {
String annFQN = ann.getFullyQualifiedName();
if ( !Watch.class.getCanonicalName().equals(annFQN) ) {
AnnotationDefinition def = buildAnnotationDef( ann, typeResolver );
pattern.getAnnotations().put( annFQN, def );
}
}
}
private AnnotationDefinition buildAnnotationDef( AnnotationDescr annotationDescr, TypeResolver resolver ) {
try {
return AnnotationDefinition.build( resolver.resolveType( annotationDescr.getFullyQualifiedName() ),
annotationDescr.getValueMap(),
resolver );
} catch ( Exception e ) {
e.printStackTrace();
AnnotationDefinition annotationDefinition = new AnnotationDefinition( annotationDescr.getFullyQualifiedName() );
for ( String propKey : annotationDescr.getValues().keySet() ) {
Object value = annotationDescr.getValue( propKey );
if ( value instanceof AnnotationDescr ) {
value = buildAnnotationDef( (AnnotationDescr) value, resolver );
}
annotationDefinition.getValues().put( propKey, new AnnotationDefinition.AnnotationPropertyVal( propKey, null, value, null ) );
}
return annotationDefinition;
}
}
protected void processListenedPropertiesAnnotation(RuleBuildContext context, PatternDescr patternDescr, Pattern pattern) {
String watchedValues = null;
try {
Watch watch = patternDescr.getTypedAnnotation(Watch.class);
watchedValues = watch == null ? null : watch.value();
} catch (Exception e) {
context.addError( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
e.getMessage() ) );
}
if (watchedValues == null) {
return;
}
List settableProperties = getSettableProperties(context, patternDescr, pattern);
List listenedProperties = new ArrayList();
for (String propertyName : watchedValues.split(",")) {
propertyName = propertyName.trim();
if (propertyName.equals("*") || propertyName.equals("!*")) {
if (listenedProperties.contains("*") || listenedProperties.contains("!*")) {
context.addError( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Duplicate usage of wildcard * in @" + Watch.class.getSimpleName() + " annotation" ) );
} else {
listenedProperties.add(propertyName);
}
continue;
}
boolean isNegative = propertyName.startsWith("!");
propertyName = isNegative ? propertyName.substring(1).trim() : propertyName;
if (settableProperties != null && !settableProperties.contains(propertyName)) {
context.addError( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Unknown property " + propertyName + " in @" + Watch.class.getSimpleName() + " annotation" ) );
} else if (listenedProperties.contains(propertyName) || listenedProperties.contains("!" + propertyName)) {
context.addError( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Duplicate property " + propertyName + " in @" + Watch.class.getSimpleName() + " annotation" ) );
} else {
listenedProperties.add(isNegative ? "!" + propertyName : propertyName);
}
}
for ( Constraint constr : pattern.getConstraints() ) {
if ( constr instanceof EvaluatorConstraint && ((EvaluatorConstraint) constr).isSelf() ) {
EvaluatorConstraint ec = ((EvaluatorConstraint) constr );
if ( ec.getEvaluator().getOperator() == IsAEvaluatorDefinition.ISA || ec.getEvaluator().getOperator() == IsAEvaluatorDefinition.NOT_ISA ) {
listenedProperties.add( TraitableBean.TRAITSET_FIELD_NAME );
}
}
}
pattern.setListenedProperties(listenedProperties);
}
protected List getSettableProperties(RuleBuildContext context, PatternDescr patternDescr, Pattern pattern) {
ObjectType patternType = pattern.getObjectType();
if (!(patternType instanceof ClassObjectType)) {
return null;
}
Class patternClass = ((ClassObjectType)patternType).getClassType();
TypeDeclaration typeDeclaration = getTypeDeclarationForPattern(context, pattern);
if (!typeDeclaration.isPropertyReactive()) {
context.addError( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Wrong usage of @" + Watch.class.getSimpleName() + " annotation on class " + patternClass.getName() + " that is not annotated as @PropertyReactive" ) );
}
typeDeclaration.setTypeClass(patternClass);
return typeDeclaration.getAccessibleProperties();
}
private TypeDeclaration getTypeDeclarationForPattern(RuleBuildContext context, Pattern pattern) {
ObjectType patternType = pattern.getObjectType();
if (!(patternType instanceof ClassObjectType)) {
return null;
}
Class patternClass = ((ClassObjectType)patternType).getClassType();
return context.getKnowledgeBuilder().getTypeDeclaration(patternClass);
}
/**
* 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 constraints = build( context, patternDescr, pattern, result, mvelCtx );
pattern.addConstraints(constraints);
}
}
combineConstraints(context, pattern, mvelCtx);
}
private void combineConstraints(RuleBuildContext context, Pattern pattern, MVELDumper.MVELDumperContext mvelCtx) {
List combinableConstraints = pattern.getCombinableConstraints();
if (combinableConstraints == null || combinableConstraints.size() < 2) {
return;
}
List declarations = new ArrayList();
List operators = new ArrayList();
Set declarationNames = new HashSet();
boolean isFirst = true;
Collection packageNames = null;
StringBuilder expressionBuilder = new StringBuilder(combinableConstraints.size() * 25);
for (MvelConstraint constraint : combinableConstraints) {
pattern.removeConstraint(constraint);
if (isFirst) {
packageNames = constraint.getPackageNames();
isFirst = false;
} else {
expressionBuilder.append(" && ");
}
String constraintExpression = constraint.getExpression();
boolean isComplex = constraintExpression.contains("&&") || constraintExpression.contains("||");
if (isComplex) {
expressionBuilder.append("( ");
}
expressionBuilder.append(constraintExpression);
if (isComplex) {
expressionBuilder.append(" )");
}
for (Declaration declaration : constraint.getRequiredDeclarations()) {
if (declarationNames.add(declaration.getBindingName())) {
declarations.add(declaration);
}
}
Collections.addAll( operators, constraint.getOperators() );
}
String expression = expressionBuilder.toString();
MVELCompilationUnit compilationUnit = getConstraintBuilder( context ).buildCompilationUnit(context, pattern, expression, mvelCtx.getAliases());
Constraint combinedConstraint = getConstraintBuilder( context ).buildMvelConstraint( packageNames,
expression,
declarations.toArray(new Declaration[declarations.size()]),
operators.toArray(new EvaluatorWrapper[operators.size()]),
compilationUnit,
IndexUtil.ConstraintType.UNKNOWN,
null, null, false );
pattern.addConstraint(combinedConstraint);
}
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 ) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
klazz,
"Unable to find @positional definitions for :" + klazz + "\n"));
return;
}
ClassDefinition clsDef = tDecl.getTypeClassDef();
if ( clsDef == null ) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"Unable to find @positional field " + descr.getPosition() + " for class " + tDecl.getTypeName() + "\n"));
return;
}
FieldDefinition field = clsDef.getField( descr.getPosition() );
if ( field == null ) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"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() );
}
}
}
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 constraints = build( context, patternDescr, pattern, result, mvelCtx);
pattern.addConstraints(constraints);
}
protected List build( RuleBuildContext context,
PatternDescr patternDescr,
Pattern pattern,
ConstraintConnectiveDescr descr,
MVELDumper.MVELDumperContext mvelCtx ) {
List constraints = new ArrayList();
List initialDescrs = new ArrayList( descr.getDescrs() );
for ( BaseDescr d : initialDescrs ) {
boolean isXPath = isXPathDescr(d);
if (isXPath && pattern.hasXPath()) {
context.addError( new DescrBuildError( context.getParentDescr(),
descr,
null,
"More than a single oopath constraint is not allowed in the same pattern" ) );
return constraints;
}
Constraint constraint = isXPath ?
buildXPathDescr(context, patternDescr, pattern, d, mvelCtx) :
buildCcdDescr(context, patternDescr, pattern, d, descr, mvelCtx);
if (constraint != null) {
Declaration declCorrXpath = getDeclarationCorrespondingToXpath( pattern, isXPath, constraint );
if (declCorrXpath == null) {
constraints.add(constraint);
} else {
// A constraint is using a declration bound to an xpath in the same pattern
// Move the constraint inside the last chunk of the xpath defining this declaration, rewriting it as 'this'
constraint = buildCcdDescr(context, patternDescr, pattern,
d.replaceVariable(declCorrXpath.getBindingName(), "this"), descr, mvelCtx);
if (constraint != null) {
pattern.getXpathConstraint().getChunks().getLast().addConstraint( constraint );
}
}
}
}
if ( descr.getDescrs().size() > initialDescrs.size() ) {
// The initial build process may have generated other constraint descrs.
// This happens when null-safe references or inline-casts are used
// These additional constraints must be built, and added as
List additionalDescrs = new ArrayList( descr.getDescrs() );
additionalDescrs.removeAll( initialDescrs );
if ( ! additionalDescrs.isEmpty() ) {
List additionalConstraints = new ArrayList();
for ( BaseDescr d : additionalDescrs ) {
Constraint constraint = buildCcdDescr(context, patternDescr, pattern, d, descr, mvelCtx);
if (constraint != null) {
additionalConstraints.add(constraint);
}
}
constraints.addAll(0, additionalConstraints);
}
}
return constraints;
}
private Declaration getDeclarationCorrespondingToXpath( Pattern pattern, boolean isXPath, Constraint constraint ) {
if (!isXPath && pattern.hasXPath()) {
Declaration xPathDecl = pattern.getXPathDeclaration();
if (xPathDecl != null) {
for ( Declaration decl : constraint.getRequiredDeclarations() ) {
if (xPathDecl.equals( decl )) {
return decl;
}
}
}
}
return null;
}
private boolean isXPathDescr(BaseDescr descr) {
return descr instanceof ExpressionDescr &&
( ((ExpressionDescr)descr).getExpression().startsWith("/") ||
((ExpressionDescr)descr).getExpression().startsWith("?/") );
}
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()) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"Invalid xpath expression '" + expression + "': " + xpathAnalysis.getError()));
return null;
}
XpathConstraint xpathConstraint = new XpathConstraint();
ObjectType objectType = pattern.getObjectType();
Class patternClass = ((ClassObjectType) objectType).getClassType();
List> 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 {
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().getClassObjectType( ((ClassObjectType) currentObjectType), xpathChunk );
if ( xpathChunk == null ) {
context.addError( new DescrBuildError( context.getParentDescr(),
descr,
null,
"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) {
context.addError( new DescrBuildError( context.getParentDescr(),
descr,
null,
"Unknown class " + part.getInlineCast() + " in xpath expression '" + expression + "'" ) );
return null;
}
part.addInlineCastConstraint( patternClass );
currentObjectType = getObjectType(context, patternDescr, patternClass.getName());
xpathChunk.setReturnedType( (ClassObjectType) 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;
}
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 aliases = mvelCtx.getAliases();
// create bindings
TypeDeclaration typeDeclaration = getTypeDeclaration(pattern, context);
for ( BindingDescr bind : mvelCtx.getBindings() ) {
buildRuleBindings( context, patternDescr, pattern, bind, typeDeclaration );
}
if (typeDeclaration != null && typeDeclaration.isPropertyReactive()) {
for ( String field : context.getRuleDescr().lookAheadFieldsOfIdentifier( patternDescr ) ) {
addFieldToPatternWatchlist( pattern, typeDeclaration, field );
}
}
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);
}
protected Constraint buildExpression( final RuleBuildContext context,
final Pattern pattern,
final BaseDescr d,
final String expr,
final Map aliases ) {
if ( "_.neg".equals ( expr) ) {
pattern.setHasNegativeConstraint( true );
return new NegConstraint();
} else if ( "!_.neg".equals ( expr) ) {
pattern.setHasNegativeConstraint( true );
return new NegConstraint(false);
}
RelationalExprDescr relDescr = d instanceof RelationalExprDescr ? (RelationalExprDescr) d : null;
boolean simple = isSimpleExpr( relDescr );
if ( simple && // simple means also relDescr is != null
!ClassObjectType.Map_ObjectType.isAssignableFrom( pattern.getObjectType() ) &&
!ClassObjectType.Match_ObjectType.isAssignableFrom( pattern.getObjectType() ) ) {
String normalizedExpr = normalizeExpression( context, pattern, relDescr, expr );
return buildRelationalExpression(context, pattern, relDescr, normalizedExpr, aliases);
}
// Either it's a complex expression, so do as predicate
// Or it's a Map and we have to treat it as a special case
return createAndBuildPredicate( context, pattern, d, rewriteOrExpressions(context, pattern, d, expr), aliases );
}
private String rewriteOrExpressions(RuleBuildContext context, Pattern pattern, BaseDescr d, String expr) {
if ( d instanceof ConstraintConnectiveDescr && ( (ConstraintConnectiveDescr) d ).getConnective() == ConnectiveType.OR ) {
String rewrittenExpr = rewriteCompositeExpressions( context, pattern, (ConstraintConnectiveDescr)d );
if (rewrittenExpr != null) {
return rewrittenExpr;
}
}
return expr;
}
private String rewriteCompositeExpressions(RuleBuildContext context, Pattern pattern, ConstraintConnectiveDescr d) {
int i = 0;
StringBuilder sb = new StringBuilder();
for (BaseDescr subDescr : d.getDescrs()) {
if (subDescr instanceof BindingDescr) {
continue;
}
if (i++ > 0) {
sb.append( " " ).append( d.getConnective().getConnective() ).append( " " );
}
String normalizedExpr;
if (subDescr instanceof RelationalExprDescr && isSimpleExpr( (RelationalExprDescr)subDescr )) {
RelationalExprDescr relDescr = (RelationalExprDescr) subDescr;
if (relDescr.getExpression() != null) {
normalizedExpr = normalizeExpression( context, pattern, relDescr, relDescr.getExpression() );
} else {
i--;
normalizedExpr = "";
}
} else if (subDescr instanceof ConstraintConnectiveDescr) {
String rewrittenExpr = rewriteCompositeExpressions(context, pattern, (ConstraintConnectiveDescr)subDescr);
if (rewrittenExpr == null) {
return null;
}
normalizedExpr = "(" + rewrittenExpr + ")";
} else if (subDescr instanceof AtomicExprDescr) {
normalizedExpr = ( (AtomicExprDescr) subDescr ).getRewrittenExpression();
} else {
return null;
}
sb.append(normalizedExpr);
}
return sb.toString();
}
private String normalizeExpression( RuleBuildContext context, Pattern pattern, RelationalExprDescr subDescr, String subExpr ) {
String leftValue = findLeftExpressionValue(subDescr);
String operator = subDescr.getOperator();
if ( isDateType( context, pattern, leftValue ) ) {
String rightValue = findRightExpressionValue( subDescr );
FieldValue fieldValue = getFieldValue(context, ValueType.DATE_TYPE, rightValue);
if (fieldValue != null) {
subExpr = subExpr.replace( rightValue, getNormalizeDate( fieldValue ) );
}
return subExpr;
}
if (operator.equals( "str" )) {
String rightValue = findRightExpressionValue( subDescr );
return normalizeStringOperator( leftValue, rightValue, new LiteralRestrictionDescr( operator,
subDescr.isNegated(),
subDescr.getParameters(),
rightValue,
LiteralRestrictionDescr.TYPE_STRING ) );
}
// resolve ambiguity between mvel's "empty" keyword and constraints like: List(empty == ...)
return normalizeEmptyKeyword( subExpr, operator );
}
private boolean isDateType( RuleBuildContext context, Pattern pattern, String leftValue ) {
Declaration declaration = pattern.getDeclarations().get( leftValue );
if (declaration != null && declaration.getExtractor() != null) {
return declaration.getValueType() == ValueType.DATE_TYPE;
}
if (pattern.getObjectType() instanceof FactTemplateObjectType) {
return ( (FactTemplateObjectType) pattern.getObjectType() ).getFactTemplate().getFieldTemplate( leftValue ).getValueType() == ValueType.DATE_TYPE;
}
Class clazz = ((ClassObjectType) pattern.getObjectType()).getClassType();
Class fieldType = context.getPkg().getClassFieldAccessorStore().getFieldType(clazz, leftValue);
return fieldType != null && ValueType.isDateType( fieldType );
}
protected Constraint buildRelationalExpression( final RuleBuildContext context,
final Pattern pattern,
final RelationalExprDescr relDescr,
final String expr,
final Map aliases ) {
String[] values = new String[2];
boolean usesThisRef = findExpressionValues(relDescr, values);
ExprBindings value1Expr = getExprBindings(context, pattern, values[0]);
ExprBindings value2Expr = getExprBindings(context, pattern, values[1]);
// build a predicate if it is a constant expression or at least has a constant on the left side
// or as a fallback when the building of a constraint fails
if (!usesThisRef && value1Expr.isConstant()) {
return createAndBuildPredicate( context, pattern, relDescr, expr, aliases );
}
Constraint constraint = buildConstraintForPattern( context, pattern, relDescr, expr, values[0], values[1], value2Expr.isConstant(), aliases );
return constraint != null ? constraint : createAndBuildPredicate( context, pattern, relDescr, expr, aliases );
}
private ExprBindings getExprBindings(RuleBuildContext context, Pattern pattern, String value) {
ExprBindings value1Expr = new ExprBindings();
setInputs( context,
value1Expr,
(pattern.getObjectType() instanceof ClassObjectType) ? ((ClassObjectType) pattern.getObjectType()).getClassType() : FactTemplate.class,
value);
return value1Expr;
}
private boolean findExpressionValues(RelationalExprDescr relDescr, String[] values) {
values[0] = findLeftExpressionValue( relDescr );
values[1] = findRightExpressionValue(relDescr);
return "this".equals( values[1] ) || values[1].startsWith("this.") || values[1].contains( ")this)." ) ||
"this".equals( values[0] ) || values[0].startsWith("this.") || values[0].contains( ")this)." );
}
private String findLeftExpressionValue(RelationalExprDescr relDescr) {
return relDescr.getLeft() instanceof AtomicExprDescr ?
((AtomicExprDescr) relDescr.getLeft()).getRewrittenExpression() :
((BindingDescr) relDescr.getLeft()).getExpression();
}
private String findRightExpressionValue(RelationalExprDescr relDescr) {
return relDescr.getRight() instanceof AtomicExprDescr ?
((AtomicExprDescr) relDescr.getRight()).getRewrittenExpression().trim() :
((BindingDescr) relDescr.getRight()).getExpression().trim();
}
protected Constraint buildConstraintForPattern( final RuleBuildContext context,
final Pattern pattern,
final RelationalExprDescr relDescr,
String expr,
String value1,
String value2,
boolean isConstant,
Map aliases) {
InternalReadAccessor extractor = getFieldReadAccessor( context, relDescr, pattern, value1, null, true );
if (extractor == null) {
return null;
}
int dotPos = value1.indexOf('.');
if (dotPos > 0) {
String part0 = value1.substring(0, dotPos).trim();
if ("this".equals( part0.trim() ) ) {
value1 = value1.substring(dotPos + 1);
} else if ( pattern.getDeclaration() != null && part0.equals( pattern.getDeclaration().getIdentifier() ) ) {
value1 = value1.substring(dotPos + 1);
expr = expr.substring(dotPos + 1);
}
}
ValueType vtype = extractor.getValueType();
String operator = relDescr.getOperator().trim();
LiteralRestrictionDescr restrictionDescr = buildLiteralRestrictionDescr(context, relDescr, value2, operator, isConstant);
if (restrictionDescr != null) {
FieldValue field = getFieldValue(context, vtype, restrictionDescr.getText().trim());
if (field != null) {
Constraint constraint = getConstraintBuilder( context ).buildLiteralConstraint(context, pattern, vtype, field, expr, value1, operator, value2, extractor, restrictionDescr, aliases);
if (constraint != null) {
return constraint;
}
}
}
value2 = context.getDeclarationResolver().normalizeValueForUnit( value2 );
Declaration declr = null;
if ( value2.indexOf( '(' ) < 0 && value2.indexOf( '.' ) < 0 && value2.indexOf( '[' ) < 0 ) {
declr = context.getDeclarationResolver().getDeclaration( value2 );
if ( declr == null ) {
// trying to create implicit declaration
final Pattern thisPattern = (Pattern) context.getDeclarationResolver().peekBuildStack();
declr = createDeclarationObject( context, value2, thisPattern );
}
}
Declaration[] declarations = null;
if ( declr == null ) {
String[] parts = value2.split( "\\." );
if ( parts.length == 2 ) {
if ( "this".equals( parts[0].trim() ) ) {
declr = createDeclarationObject(context, parts[1].trim(), (Pattern) context.getDeclarationResolver().peekBuildStack());
value2 = parts[1].trim();
} else {
declr = context.getDeclarationResolver().getDeclaration( parts[0].trim() );
// if a declaration exists, then it may be a variable direct property access
if ( declr != null ) {
if ( declr.isPatternDeclaration() ) {
// TODO: no need to extract inner declaration when using mvel constraint
declarations = new Declaration[] { declr };
declr = createDeclarationObject(context, parts[1].trim(), declr.getPattern());
value2 = parts[1].trim();
} else {
// we will later fallback to regular predicates, so don't raise error
return null;
}
}
}
}
}
if (declarations == null) {
if (declr != null) {
declarations = new Declaration[] { declr };
} else {
declarations = getDeclarationsForReturnValue(context, relDescr, operator, value2);
if (declarations == null) {
return null;
}
}
}
return getConstraintBuilder( context ).buildVariableConstraint(context, pattern, expr, declarations, value1, relDescr.getOperatorDescr(), value2, extractor, declr, relDescr, aliases);
}
private Declaration[] getDeclarationsForReturnValue(RuleBuildContext context, RelationalExprDescr relDescr, String operator, String value2) {
Pattern pattern = (Pattern) context.getDeclarationResolver().peekBuildStack();
ReturnValueRestrictionDescr returnValueRestrictionDescr = new ReturnValueRestrictionDescr( operator, relDescr, value2 );
Class< ? > thisClass = pattern.getObjectType() instanceof ClassObjectType ?
((ClassObjectType) pattern.getObjectType()).getClassType() :
null;
AnalysisResult analysis = context.getDialect().analyzeExpression(context,
returnValueRestrictionDescr,
returnValueRestrictionDescr.getContent(),
new BoundIdentifiers(pattern, context, null, thisClass));
if ( analysis == null ) {
// something bad happened
return null;
}
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
final List tupleDeclarations = new ArrayList();
final List factDeclarations = new ArrayList();
for ( String id : usedIdentifiers.getDeclrClasses().keySet() ) {
Declaration decl = context.getDeclarationResolver().getDeclaration( id );
if ( decl.getPattern() == pattern ) {
factDeclarations.add( decl );
} else {
tupleDeclarations.add( decl );
}
}
createImplicitBindings( context, pattern, analysis.getNotBoundedIdentifiers(), usedIdentifiers, factDeclarations );
final Declaration[] previousDeclarations = tupleDeclarations.toArray( new Declaration[tupleDeclarations.size()] );
final Declaration[] localDeclarations = factDeclarations.toArray( new Declaration[factDeclarations.size()] );
Arrays.sort( previousDeclarations, SortDeclarations.instance );
Arrays.sort( localDeclarations, SortDeclarations.instance );
final String[] requiredGlobals = usedIdentifiers.getGlobals().keySet().toArray( new String[usedIdentifiers.getGlobals().size()] );
Declaration[] requiredDeclarations = new Declaration[previousDeclarations.length + localDeclarations.length];
System.arraycopy( previousDeclarations,
0,
requiredDeclarations,
0,
previousDeclarations.length );
System.arraycopy( localDeclarations,
0,
requiredDeclarations,
previousDeclarations.length,
localDeclarations.length );
Declaration[] declarations = new Declaration[requiredDeclarations.length + requiredGlobals.length];
int i = 0;
for (Declaration requiredDeclaration : requiredDeclarations) {
declarations[i++] = requiredDeclaration;
}
for (String requiredGlobal : requiredGlobals) {
declarations[i++] = context.getDeclarationResolver().getDeclaration(requiredGlobal);
}
return declarations;
}
protected LiteralRestrictionDescr buildLiteralRestrictionDescr(RuleBuildContext context,
RelationalExprDescr exprDescr,
String rightValue,
String operator,
boolean isRightLiteral) {
// is it a literal? Does not include enums
if ( isRightLiteral ) {
return new LiteralRestrictionDescr(operator, exprDescr.isNegated(), exprDescr.getParameters(), rightValue, LiteralRestrictionDescr.TYPE_STRING);
}
// is it an enum?
int dotPos = rightValue.lastIndexOf( '.' );
if ( dotPos >= 0 ) {
final String mainPart = rightValue.substring( 0,
dotPos );
String lastPart = rightValue.substring( dotPos + 1 );
try {
context.getDialect().getTypeResolver().resolveType( mainPart );
if ( lastPart.indexOf( '(' ) < 0 && lastPart.indexOf( '.' ) < 0 && lastPart.indexOf( '[' ) < 0 ) {
return new LiteralRestrictionDescr(operator, exprDescr.isNegated(), exprDescr.getParameters(), rightValue, LiteralRestrictionDescr.TYPE_STRING );
}
} catch ( ClassNotFoundException e ) {
// do nothing as this is just probing to see if it was a class, which we now know it isn't :)
} catch ( NoClassDefFoundError e ) {
// do nothing as this is just probing to see if it was a class, which we now know it isn't :)
}
}
return null;
}
protected Constraint processAtomicExpression( RuleBuildContext context,
Pattern pattern,
BaseDescr d,
String expr,
Map aliases ) {
if ( d instanceof AtomicExprDescr ) {
Matcher m = evalRegexp.matcher( ((AtomicExprDescr) d).getExpression() );
if ( m.find() ) {
// MVELDumper already stripped the eval
// this will build the eval using the specified dialect
PredicateDescr pdescr = new PredicateDescr( context.getRuleDescr().getResource(), expr );
pdescr.copyLocation(d);
return buildEval( context, pattern, pdescr, aliases, expr, true );
}
}
return null;
}
protected boolean isSimpleExpr( final RelationalExprDescr relDescr ) {
boolean simple = false;
if ( relDescr != null ) {
if ( (relDescr.getLeft() instanceof AtomicExprDescr || relDescr.getLeft() instanceof BindingDescr) &&
(relDescr.getRight() instanceof AtomicExprDescr || relDescr.getRight() instanceof BindingDescr) ) {
simple = true;
}
}
return simple;
}
protected Constraint createAndBuildPredicate( RuleBuildContext context,
Pattern pattern,
BaseDescr base,
String expr,
Map aliases ) {
Dialect dialect = context.getDialect();
MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
context.setDialect( mvelDialect );
PredicateDescr pdescr = new PredicateDescr( context.getRuleDescr().getResource(), expr );
pdescr.copyParameters( base );
pdescr.copyLocation( base );
Constraint evalConstraint = buildEval(context, pattern, pdescr, aliases, expr, false);
// fall back to original dialect
context.setDialect(dialect);
return evalConstraint;
}
protected void setInputs( RuleBuildContext context,
ExprBindings descrBranch,
Class< ? > thisClass,
String expr ) {
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
ParserConfiguration conf = data.getParserConfiguration();
conf.setClassLoader( context.getKnowledgeBuilder().getRootClassLoader() );
final ParserContext pctx = new ParserContext( conf );
pctx.setStrictTypeEnforcement(false);
pctx.setStrongTyping( false );
pctx.addInput( "this", thisClass );
pctx.addInput( "empty", boolean.class ); // overrides the mvel empty label
MVEL.COMPILER_OPT_ALLOW_NAKED_METH_CALL = true;
MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true;
MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;
try {
MVEL.analysisCompile( expr, pctx );
} catch (Exception e) {
// There is a problem in setting the inputs for this expression, but it will be
// reported during expression analysis, so swallow it at the moment
return;
}
if ( !pctx.getInputs().isEmpty() ) {
for ( String v : pctx.getInputs().keySet() ) {
// in the following if, we need to check that the expr actually contains a reference
// to an "empty" property, or the if will evaluate to true even if it doesn't
if ( "this".equals( v ) || (PropertyTools.getFieldOrAccessor( thisClass,
v ) != null && expr.matches( "(^|.*\\W)empty($|\\W.*)" )) ) {
descrBranch.getFieldAccessors().add( v );
} else if ( "empty".equals( v ) ) {
// do nothing
} else if ( !context.getPkg().getGlobals().containsKey( v ) ) {
descrBranch.getRuleBindings().add( v );
} else {
descrBranch.getGlobalBindings().add( v );
}
}
}
}
public static class ExprBindings {
protected Set globalBindings;
protected Set ruleBindings;
protected Set fieldAccessors;
public ExprBindings() {
this.globalBindings = new HashSet();
this.ruleBindings = new HashSet();
this.fieldAccessors = new HashSet();
}
public Set getGlobalBindings() {
return globalBindings;
}
public Set getRuleBindings() {
return ruleBindings;
}
public Set getFieldAccessors() {
return fieldAccessors;
}
public boolean isConstant() {
return this.globalBindings.isEmpty() && this.ruleBindings.isEmpty() && this.fieldAccessors.size() <= 1; // field accessors might contain the "this" reference
}
}
protected void buildRuleBindings( RuleBuildContext context,
PatternDescr patternDescr,
Pattern pattern,
BindingDescr fieldBindingDescr ) {
buildRuleBindings( context, patternDescr, pattern, fieldBindingDescr, getTypeDeclaration(pattern, context) );
}
protected void buildRuleBindings( RuleBuildContext context,
PatternDescr patternDescr,
Pattern pattern,
BindingDescr fieldBindingDescr,
TypeDeclaration typeDeclaration ) {
if ( context.getDeclarationResolver().isDuplicated( context.getRule(),
fieldBindingDescr.getVariable(),
null ) ) {
processDuplicateBindings( fieldBindingDescr.isUnification(),
patternDescr,
pattern,
fieldBindingDescr,
fieldBindingDescr.getBindingField(),
fieldBindingDescr.getVariable(),
context );
if ( fieldBindingDescr.isUnification() ) {
return;
}
}
Declaration declr = pattern.addDeclaration( fieldBindingDescr.getVariable() );
final InternalReadAccessor extractor = getFieldReadAccessor( context,
fieldBindingDescr,
pattern,
fieldBindingDescr.getBindingField(),
declr,
true );
if (extractor == null) {
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"Field Reader does not exist for declaration '" + fieldBindingDescr.getVariable() + "' in '" + fieldBindingDescr + "' in the rule '" + context.getRule().getName() + "'"));
return;
}
declr.setReadAccessor( extractor );
if ( typeDeclaration != null && extractor instanceof ClassFieldReader ) {
addFieldToPatternWatchlist( pattern, typeDeclaration, (( ClassFieldReader) extractor ).getFieldName() );
}
}
private void addFieldToPatternWatchlist( Pattern pattern, TypeDeclaration typeDeclaration, String fieldName ) {
if ( typeDeclaration.getAccessibleProperties().contains( fieldName ) ) {
Collection watchlist = pattern.getListenedProperties();
if ( watchlist == null ) {
watchlist = new HashSet<>( );
pattern.setListenedProperties( watchlist );
}
watchlist.add( fieldName );
}
}
private TypeDeclaration getTypeDeclaration(Pattern pattern, RuleBuildContext context) {
if ( pattern.getObjectType() instanceof ClassObjectType ) {
Class patternClass = ( (ClassObjectType) pattern.getObjectType() ).getClassType();
return context.getKnowledgeBuilder().getTypeDeclaration( patternClass );
}
return null;
}
@SuppressWarnings("unchecked")
protected Constraint buildEval( final RuleBuildContext context,
final Pattern pattern,
final PredicateDescr predicateDescr,
final Map aliases,
final String expr,
final boolean isEvalExpression) {
AnalysisResult analysis = buildAnalysis(context, pattern, predicateDescr, aliases );
if ( analysis == null ) {
// something bad happened
return null;
}
Declaration[][] usedDeclarations = getUsedDeclarations(context, pattern, analysis);
Declaration[] previousDeclarations = usedDeclarations[0];
Declaration[] localDeclarations = usedDeclarations[1];
BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
Arrays.sort( previousDeclarations, SortDeclarations.instance );
Arrays.sort( localDeclarations, SortDeclarations.instance );
boolean isJavaEval = isEvalExpression && context.getDialect() instanceof JavaDialect;
if (isJavaEval) {
final PredicateConstraint predicateConstraint = new PredicateConstraint(null,
previousDeclarations,
localDeclarations);
final PredicateBuilder builder = context.getDialect().getPredicateBuilder();
builder.build(context,
usedIdentifiers,
previousDeclarations,
localDeclarations,
predicateConstraint,
predicateDescr,
analysis);
return predicateConstraint;
}
MVELCompilationUnit compilationUnit = getConstraintBuilder( context ).buildCompilationUnit( context,
previousDeclarations,
localDeclarations,
predicateDescr,
analysis);
String[] requiredGlobals = usedIdentifiers.getGlobals().keySet().toArray( new String[usedIdentifiers.getGlobals().size()] );
Declaration[] mvelDeclarations = new Declaration[previousDeclarations.length + localDeclarations.length + requiredGlobals.length];
int i = 0;
for (Declaration d : previousDeclarations) {
mvelDeclarations[i++] = d;
}
for (Declaration d : localDeclarations) {
mvelDeclarations[i++] = d;
}
for (String global : requiredGlobals) {
mvelDeclarations[i++] = context.getDeclarationResolver().getDeclaration(global);
}
boolean isDynamic =
!((ClassObjectType)pattern.getObjectType()).getClassType().isArray() &&
!context.getKnowledgeBuilder().getTypeDeclaration(((ClassObjectType)pattern.getObjectType()).getClassType()).isTypesafe();
return getConstraintBuilder( context ).buildMvelConstraint( context.getPkg().getName(), expr, mvelDeclarations, getOperators( usedIdentifiers.getOperators() ), compilationUnit, isDynamic );
}
protected static EvaluatorWrapper[] getOperators( Map operatorMap ) {
EvaluatorWrapper[] operators = new EvaluatorWrapper[operatorMap.size()];
int i = 0;
for (Map.Entry entry : operatorMap.entrySet()) {
EvaluatorWrapper evaluator = entry.getValue();
evaluator.setBindingName( entry.getKey() );
operators[i++] = evaluator;
}
return operators;
}
public static Declaration[][] getUsedDeclarations(RuleBuildContext context, Pattern pattern, AnalysisResult analysis) {
BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
final List tupleDeclarations = new ArrayList();
final List factDeclarations = new ArrayList();
for ( String id : usedIdentifiers.getDeclrClasses().keySet() ) {
Declaration decl = context.getDeclarationResolver().getDeclaration( id );
if ( decl.getPattern() == pattern ) {
factDeclarations.add( decl );
} else {
tupleDeclarations.add( decl );
}
}
createImplicitBindings( context,
pattern,
analysis.getNotBoundedIdentifiers(),
analysis.getBoundIdentifiers(),
factDeclarations );
Declaration[][] usedDeclarations = new Declaration[2][];
usedDeclarations[0] = tupleDeclarations.toArray( new Declaration[tupleDeclarations.size()] );
usedDeclarations[1] = factDeclarations.toArray( new Declaration[factDeclarations.size()] );
return usedDeclarations;
}
public static AnalysisResult buildAnalysis(RuleBuildContext context, Pattern pattern, PredicateDescr predicateDescr, Map aliases ) {
Map operators = aliases == null ? new HashMap() : buildOperators(context, pattern, predicateDescr, aliases);
Class< ? > thisClass = pattern.getObjectType() instanceof ClassObjectType ?
((ClassObjectType) pattern.getObjectType()).getClassType() : null;
return context.getDialect().analyzeExpression( context,
predicateDescr,
predicateDescr.getContent(),
new BoundIdentifiers( pattern,
context,
operators,
thisClass ) );
}
protected static Map buildOperators(RuleBuildContext context,
Pattern pattern,
BaseDescr predicateDescr,
Map aliases) {
if (aliases.isEmpty()) {
return Collections.emptyMap();
}
Map operators = new HashMap();
for ( Map.Entry entry : aliases.entrySet() ) {
OperatorDescr op = entry.getValue();
Declaration leftDecl = createDeclarationForOperator(context, pattern, op.getLeftString());
Declaration rightDecl = createDeclarationForOperator(context, pattern, op.getRightString());
Target left = leftDecl != null && leftDecl.isPatternDeclaration() ? Target.HANDLE : Target.FACT;
Target right = rightDecl != null && rightDecl.isPatternDeclaration() ? Target.HANDLE : Target.FACT;
op.setLeftIsHandle( left == Target.HANDLE );
op.setRightIsHandle( right == Target.HANDLE );
Evaluator evaluator = getConstraintBuilder( context ).getEvaluator( context,
predicateDescr,
ValueType.OBJECT_TYPE,
op.getOperator(),
false, // the rewrite takes care of negation
op.getParametersText(),
left,
right);
EvaluatorWrapper wrapper = getConstraintBuilder( context ).wrapEvaluator( evaluator, leftDecl, rightDecl );
operators.put( entry.getKey(), wrapper );
}
return operators;
}
private static Declaration createDeclarationForOperator(RuleBuildContext context, Pattern pattern, String expr) {
Declaration declaration;
int dotPos = expr.indexOf('.');
if (dotPos < 0) {
if (!isIdentifier(expr)) {
return null;
}
declaration = context.getDeclarationResolver().getDeclaration( expr );
if ( declaration == null) {
if ( "this".equals( expr ) ) {
declaration = createDeclarationObject( context, "this", pattern );
} else {
declaration = new Declaration("this", pattern);
context.getPkg().getClassFieldAccessorStore().getReader( ((ClassObjectType) pattern.getObjectType()).getClassName(), expr, declaration );
}
}
} else {
String part1 = expr.substring(0, dotPos).trim();
String part2 = expr.substring(dotPos+1).trim();
if ( "this".equals( part1 ) ) {
declaration = createDeclarationObject(context, part2, (Pattern) context.getDeclarationResolver().peekBuildStack());
} else {
declaration = context.getDeclarationResolver().getDeclaration( part1 );
// if a declaration exists, then it may be a variable direct property access
if ( declaration != null ) {
declaration = createDeclarationObject(context, part2, declaration.getPattern());
}
}
}
return declaration;
}
protected static ConstraintBuilder getConstraintBuilder( RuleBuildContext context ) {
return context.getCompilerFactory().getConstraintBuilderFactoryService().newConstraintBuilder();
}
public static void createImplicitBindings( final RuleBuildContext context,
final Pattern pattern,
final Set unboundIdentifiers,
final BoundIdentifiers boundIdentifiers,
final List factDeclarations ) {
for ( Iterator it = unboundIdentifiers.iterator(); it.hasNext(); ) {
String identifier = it.next();
Declaration declaration = createDeclarationObject( context,
identifier,
pattern );
// the name may not be a local field, such as enums
// maybe should have a safer way to detect this, as other issues may cause null too
// that we would need to know about
if ( declaration != null ) {
factDeclarations.add( declaration );
// implicit bindings need to be added to "local" declarations, as they are nolonger unbound
boundIdentifiers.getDeclrClasses().put( identifier,
declaration.getDeclarationClass() );
it.remove();
}
}
}
/**
* Creates a declaration object for the field identified by the given identifier
* on the give pattern object
*/
protected static Declaration createDeclarationObject( final RuleBuildContext context,
final String identifier,
final Pattern pattern ) {
return createDeclarationObject( context, identifier, identifier, pattern );
}
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;
}
private FieldValue getFieldValue( RuleBuildContext context,
ValueType vtype,
String value) {
try {
MVEL.COMPILER_OPT_ALLOW_NAKED_METH_CALL = true;
MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true;
MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
ParserConfiguration pconf = data.getParserConfiguration();
ParserContext pctx = new ParserContext( pconf );
Object o = MVELSafeHelper.getEvaluator().executeExpression( MVEL.compileExpression( value, pctx ) );
if ( o != null && vtype == null ) {
// was a compilation problem else where, so guess valuetype so we can continue
vtype = ValueType.determineValueType( o.getClass() );
}
return context.getCompilerFactory().getFieldFactory().getFieldValue(o, vtype);
} catch ( final Exception e ) {
// we will fallback to regular preducates, so don't raise an error
}
return null;
}
public static void registerReadAccessor( final RuleBuildContext context,
final ObjectType objectType,
final String fieldName,
final AcceptsReadAccessor target ) {
if ( !ValueType.FACTTEMPLATE_TYPE.equals( objectType.getValueType() ) ) {
context.getPkg().getClassFieldAccessorStore().getReader( ((ClassObjectType) objectType).getClassName(), fieldName, target );
}
}
public static InternalReadAccessor getFieldReadAccessor( final RuleBuildContext context,
final BaseDescr descr,
final Pattern pattern,
String fieldName,
final AcceptsReadAccessor target,
final boolean reportError ) {
return getFieldReadAccessor( context, descr, pattern, pattern.getObjectType(), fieldName, target, reportError );
}
public static InternalReadAccessor getFieldReadAccessor( final RuleBuildContext context,
final BaseDescr descr,
final Pattern pattern,
final ObjectType objectType,
String fieldName,
final AcceptsReadAccessor target,
final boolean reportError ) {
// reportError is needed as some times failure to build accessor is not a failure, just an indication that building is not possible so try something else.
InternalReadAccessor reader;
if ( ValueType.FACTTEMPLATE_TYPE.equals( objectType.getValueType() ) ) {
//@todo use accessor cache
final FactTemplate factTemplate = ((FactTemplateObjectType) objectType).getFactTemplate();
reader = new FactTemplateFieldExtractor( factTemplate, factTemplate.getFieldTemplateIndex( fieldName ) );
if ( target != null ) {
target.setReadAccessor( reader );
}
return reader;
}
boolean isGetter = getterRegexp.matcher( fieldName ).matches();
if ( isGetter ) {
fieldName = fieldName.substring(3, fieldName.indexOf('(')).trim();
}
if ( isGetter || identifierRegexp.matcher( fieldName ).matches() ) {
Declaration decl = context.getDeclarationResolver().getDeclarations( context.getRule() ).get(fieldName);
if (decl != null && decl.getExtractor() instanceof ClassFieldReader && "this".equals(((ClassFieldReader)decl.getExtractor()).getFieldName())) {
return decl.getExtractor();
}
try {
reader = context.getPkg().getClassFieldAccessorStore().getReader( ((ClassObjectType) objectType).getClassName(),
fieldName,
target );
} catch ( final Exception e ) {
if ( reportError && context.isTypesafe() ) {
DialectUtil.copyErrorLocation(e,
descr);
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
e,
"Unable to create Field Extractor for '" + fieldName + "'" + e.getMessage()));
}
// if there was an error, set the reader back to null
reader = null;
} finally {
if (reportError) {
Collection results = context.getPkg().getClassFieldAccessorStore()
.getWiringResults( ( (ClassObjectType) objectType ).getClassType(), fieldName );
if (!results.isEmpty()) {
for (KnowledgeBuilderResult res : results) {
if (res.getSeverity() == ResultSeverity.ERROR) {
context.addError(new DroolsErrorWrapper(res));
} else {
context.addWarning(new DroolsWarningWrapper(res));
}
}
}
}
}
} else {
// we need MVEL extractor for expressions
Dialect dialect = context.getDialect();
try {
MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
context.setDialect( mvelDialect );
final AnalysisResult analysis = context.getDialect().analyzeExpression( context,
descr,
fieldName,
new BoundIdentifiers( pattern, context, Collections.EMPTY_MAP,
((ClassObjectType) objectType).getClassType() ) );
if ( analysis == null ) {
// something bad happened
if ( reportError ) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"Unable to analyze expression '" + fieldName + "'"));
}
return null;
}
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
if ( !usedIdentifiers.getDeclrClasses().isEmpty() ) {
if ( reportError && descr instanceof BindingDescr ) {
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
null,
"Variables can not be used inside bindings. Variable " + usedIdentifiers.getDeclrClasses().keySet() + " is being used in binding '" + fieldName + "'"));
}
return null;
}
reader = context.getPkg().getClassFieldAccessorStore().getMVELReader( context.getPkg().getName(),
((ClassObjectType) objectType).getClassName(),
fieldName,
context.isTypesafe(),
((MVELAnalysisResult)analysis).getReturnType() );
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
((MVELCompileable) reader).compile( data, context.getRule() );
data.addCompileable( (MVELCompileable) reader );
} catch ( final Exception e ) {
int dotPos = fieldName.indexOf('.');
String varName = dotPos > 0 ? fieldName.substring(0, dotPos).trim() : fieldName;
if (context.getKnowledgeBuilder().getGlobals().containsKey(varName)) {
return null;
}
if ( reportError ) {
DialectUtil.copyErrorLocation(e, descr);
context.addError(new DescrBuildError(context.getParentDescr(),
descr,
e,
"Unable to create reader for '" + fieldName + "':" + e.getMessage()));
}
// if there was an error, set the reader back to null
reader = null;
} finally {
context.setDialect( dialect );
}
}
return reader;
}
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) {
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"Unable to parse pattern expression:\n" + expression));
return null;
}
result.copyLocation( original );
if ( parser.hasErrors() ) {
for ( DroolsParserException error : parser.getErrors() ) {
context.addError(new DescrBuildError(context.getParentDescr(),
patternDescr,
null,
"Unable to parse pattern expression:\n" + error.getMessage()));
}
return null;
}
return result;
}
}
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