org.drools.compiler.builder.impl.ClassHierarchyManager Maven / Gradle / Ivy
/*
* Copyright 2015 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.
*
* 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.builder.impl;
import java.io.IOException;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.drools.compiler.compiler.PackageRegistry;
import org.drools.compiler.compiler.TypeDeclarationError;
import org.drools.compiler.lang.descr.AbstractClassTypeDeclarationDescr;
import org.drools.compiler.lang.descr.AnnotationDescr;
import org.drools.compiler.lang.descr.PatternDescr;
import org.drools.compiler.lang.descr.QualifiedName;
import org.drools.compiler.lang.descr.TypeDeclarationDescr;
import org.drools.compiler.lang.descr.TypeFieldDescr;
import org.drools.core.base.TypeResolver;
import org.drools.core.definitions.InternalKnowledgePackage;
import org.drools.core.factmodel.ClassDefinition;
import org.drools.core.factmodel.FieldDefinition;
import org.drools.core.factmodel.traits.Alias;
import org.drools.core.rule.TypeDeclaration;
import org.drools.core.util.HierarchySorter;
import org.drools.core.util.asm.ClassFieldInspector;
import org.kie.api.definition.type.Key;
import org.kie.api.io.Resource;
public class ClassHierarchyManager {
protected KnowledgeBuilderImpl kbuilder;
protected List sortedDescriptors;
protected Map> taxonomy;
public ClassHierarchyManager( Collection unsortedDescrs, KnowledgeBuilderImpl kbuilder ) {
this.kbuilder = kbuilder;
this.sortedDescriptors = sortByHierarchy( unsortedDescrs, kbuilder );
}
public List getSortedDescriptors() {
return sortedDescriptors;
}
/**
* Utility method to sort declared beans. Linearizes the hierarchy,
* i.e.generates a sequence of declaration such that, if Sub is subclass of
* Sup, then the index of Sub will be > than the index of Sup in the
* resulting collection. This ensures that superclasses are processed before
* their subclasses
*/
protected List sortByHierarchy( Collection unsortedDescrs, KnowledgeBuilderImpl kbuilder ) {
taxonomy = new HashMap>();
Map cache = new HashMap();
for (AbstractClassTypeDeclarationDescr tdescr : unsortedDescrs) {
cache.put(tdescr.getType(), tdescr);
}
for (AbstractClassTypeDeclarationDescr tdescr : unsortedDescrs) {
QualifiedName name = tdescr.getType();
Collection supers = taxonomy.get(name);
if (supers == null) {
supers = new ArrayList();
taxonomy.put(name, supers);
} else {
kbuilder.addBuilderResult(new TypeDeclarationError(tdescr,
"Found duplicate declaration for type " + tdescr.getType()));
}
boolean circular = false;
for (QualifiedName sup : tdescr.getSuperTypes()) {
if (!Object.class.getName().equals(name.getFullName())) {
if (!hasCircularDependency(tdescr.getType(), sup, taxonomy)) {
if ( cache.containsKey( sup ) ) {
supers.add( sup );
}
} else {
circular = true;
kbuilder.addBuilderResult(new TypeDeclarationError(tdescr,
"Found circular dependency for type " + tdescr.getTypeName()));
break;
}
}
}
if (circular) {
tdescr.getSuperTypes().clear();
}
}
for (AbstractClassTypeDeclarationDescr tdescr : unsortedDescrs) {
for (TypeFieldDescr field : tdescr.getFields().values()) {
QualifiedName name = tdescr.getType();
QualifiedName typeName = new QualifiedName(field.getPattern().getObjectType());
if (!hasCircularDependency(name, typeName, taxonomy)) {
if ( cache.containsKey( typeName ) ) {
taxonomy.get( name ).add( typeName );
}
} else {
field.setRecursive( true );
}
}
}
List sorted = new HierarchySorter().sort(taxonomy);
ArrayList list = new ArrayList( sorted.size() );
for ( QualifiedName name : sorted ) {
list.add( cache.get( name ) );
}
return list;
}
protected static boolean hasCircularDependency(QualifiedName name,
QualifiedName typeName,
Map> taxonomy) {
if (name.equals( typeName )) {
return true;
}
Collection parents = taxonomy.get(typeName);
if (parents != null) {
if (parents.contains(name)) {
return true;
} else {
for (QualifiedName ancestor : parents) {
if (hasCircularDependency(name, ancestor, taxonomy)) {
return true;
}
}
}
}
return false;
}
public void inheritFields( PackageRegistry pkgRegistry,
AbstractClassTypeDeclarationDescr typeDescr,
Collection sortedTypeDescriptors,
List unresolvedTypes,
Map unprocessableDescrs ) {
TypeDeclarationDescr tDescr = (TypeDeclarationDescr) typeDescr;
boolean isNovel = TypeDeclarationUtils.isNovelClass( typeDescr, pkgRegistry );
boolean inferFields = ! isNovel && typeDescr.getFields().isEmpty();
for ( QualifiedName qname : tDescr.getSuperTypes() ) {
//descriptor needs fields inherited from superclass
mergeInheritedFields(tDescr, unresolvedTypes, unprocessableDescrs, pkgRegistry.getTypeResolver() );
}
if ( inferFields ) {
// not novel, but only an empty declaration was provided.
// after inheriting the fields from supertypes, now we fill in the locally declared fields
Class existingClass = TypeDeclarationUtils.getExistingDeclarationClass( typeDescr, pkgRegistry );
buildDescrsFromFields( existingClass, tDescr, pkgRegistry, tDescr.getFields());
}
}
private static void buildDescrsFromFields( Class klass, TypeDeclarationDescr typeDescr,
PackageRegistry pkgRegistry, Map fieldMap ) {
ClassFieldInspector inspector = null;
try {
inspector = new ClassFieldInspector( klass );
} catch (IOException e) {
throw new RuntimeException( e );
}
for (String name : inspector.getGetterMethods().keySet()) {
// classFieldAccessor requires both getter and setter
if (inspector.getSetterMethods().containsKey(name)) {
if (!inspector.isNonGetter(name) && !"class".equals(name)) {
Resource resource = typeDescr.getResource();
PatternDescr patternDescr = new PatternDescr( inspector.getFieldType(name).getName());
patternDescr.setResource(resource);
TypeFieldDescr inheritedFlDescr = new TypeFieldDescr( name, patternDescr);
inheritedFlDescr.setResource(resource);
inheritedFlDescr.setInherited(!Modifier.isAbstract( inspector.getGetterMethods().get( name ).getModifiers() ));
if (!fieldMap.containsKey(inheritedFlDescr.getFieldName()))
fieldMap.put(inheritedFlDescr.getFieldName(),
inheritedFlDescr);
}
}
}
}
/**
* In order to build a declared class, the fields inherited from its
* superclass(es) are added to its declaration. Inherited descriptors are
* marked as such to distinguish them from native ones. Various scenarioes
* are possible. (i) The superclass has been declared in the DRL as well :
* the fields are cloned as inherited (ii) The superclass is imported
* (external), but some of its fields have been tagged with metadata (iii)
* The superclass is imported.
*
* The search for field descriptors is carried out in the order. (i) and
* (ii+iii) are mutually exclusive. The search is as such: (i) The
* superclass' declared fields are used to build the base class additional
* fields (iii) The superclass is inspected to discover its (public) fields,
* from which descriptors are generated (ii) Both (i) and (iii) are applied,
* but the declared fields override the inspected ones
*
*
*
* @param typeDescr
* The base class descriptor, to be completed with the inherited
* fields descriptors
* @return true if all went well
*/
protected void mergeInheritedFields( TypeDeclarationDescr typeDescr,
List unresolvedTypes,
Map unprocessableDescrs,
TypeResolver typeResolver ) {
if (typeDescr.getSuperTypes().isEmpty()) {
return;
}
for (int j = typeDescr.getSuperTypes().size() - 1; j >= 0; j--) {
QualifiedName qname = typeDescr.getSuperTypes().get(j);
String simpleSuperTypeName = qname.getName();
String superTypePackageName = qname.getNamespace();
String fullSuper = qname.getFullName();
mergeFields( simpleSuperTypeName,
superTypePackageName,
fullSuper,
typeDescr,
unresolvedTypes,
unprocessableDescrs,
typeResolver );
}
}
protected void mergeFields( String simpleSuperTypeName,
String superTypePackageName,
String fullSuper,
TypeDeclarationDescr typeDescr,
List unresolvedTypes,
Map unprocessableDescrs,
TypeResolver resolver ) {
Map fieldMap = new LinkedHashMap();
boolean isNovel = TypeDeclarationUtils.isNovelClass( typeDescr, kbuilder.getPackageRegistry( typeDescr.getNamespace() ) );
PackageRegistry registry = kbuilder.getPackageRegistry( superTypePackageName );
InternalKnowledgePackage pack = null;
if ( registry != null ) {
pack = registry.getPackage();
}
if ( unprocessableDescrs.containsKey( fullSuper ) ) {
unprocessableDescrs.put( typeDescr.getType().getFullName(), typeDescr );
return;
}
// if a class is declared in DRL, its package can't be null? The default package is replaced by "defaultpkg"
boolean isSuperClassTagged = false;
boolean isSuperClassDeclared = true; //in the same package, or in a previous one
if ( pack != null ) {
// look for the supertype declaration in available packages
TypeDeclaration superTypeDeclaration = pack.getTypeDeclaration( simpleSuperTypeName );
if (superTypeDeclaration != null && superTypeDeclaration.getTypeClassDef() != null ) {
ClassDefinition classDef = superTypeDeclaration.getTypeClassDef();
// inherit fields
for (org.kie.api.definition.type.FactField fld : classDef.getFields()) {
TypeFieldDescr inheritedFlDescr = buildInheritedFieldDescrFromDefinition(fld, typeDescr);
fieldMap.put(inheritedFlDescr.getFieldName(),
inheritedFlDescr);
}
// new classes are already distinguished from tagged external classes
isSuperClassTagged = !superTypeDeclaration.isNovel();
}
} else {
isSuperClassDeclared = false;
}
// look for the class externally
if ( !isSuperClassDeclared || isSuperClassTagged ) {
try {
Class superKlass;
if ( registry != null ) {
superKlass = registry.getTypeResolver().resolveType(fullSuper);
} else {
// if the supertype has not been declared, and we have got so far, it means that this class is not novel
superKlass = resolver.resolveType( fullSuper );
}
buildDescrsFromFields( superKlass, typeDescr, registry, fieldMap);
} catch (ClassNotFoundException cnfe) {
unprocessableDescrs.put( typeDescr.getType().getFullName(), typeDescr );
return;
}
}
// finally, locally declared fields are merged. The map swap ensures that super-fields are added in order, before the subclass' ones
// notice that it is not possible to override a field changing its type
for ( String fieldName : typeDescr.getFields().keySet() ) {
if ( fieldMap.containsKey( fieldName ) ) {
String type1 = fieldMap.get( fieldName ).getPattern().getObjectType();
String type2 = typeDescr.getFields().get( fieldName ).getPattern().getObjectType();
if (type2.lastIndexOf(".") < 0) {
try {
TypeResolver typeResolver = kbuilder.getPackageRegistry( typeDescr.getNamespace() ).getTypeResolver();
type1 = typeResolver.resolveType( type1 ).getName();
type2 = typeResolver.resolveType( type2 ).getName();
// now that we are at it... this will be needed later anyway
fieldMap.get( fieldName ).getPattern().setObjectType( type1 );
typeDescr.getFields().get( fieldName ).getPattern().setObjectType( type2 );
} catch (ClassNotFoundException cnfe) {
// will fail later
}
}
boolean clash = ! type1.equals(type2);
TypeFieldDescr overriding = null;
if ( clash ) {
// this may still be an override using a subclass of the original type
try {
Class sup = resolver.resolveType( type1 );
Class loc = resolver.resolveType( type2 );
if ( sup.isAssignableFrom( loc ) ) {
clash = false;
// mark as non inherited so that a new field is actually built
overriding = fieldMap.get( fieldName );
}
} catch ( ClassNotFoundException cnfe ) {
// not much to do
}
}
if ( clash ) {
kbuilder.addBuilderResult(new TypeDeclarationError(typeDescr,
"Cannot redeclare field '" + fieldName + " from " + type1 + " to " + type2));
typeDescr.setType(null,null);
return;
} else {
String initVal = fieldMap.get(fieldName).getInitExpr();
TypeFieldDescr fd = typeDescr.getFields().get(fieldName);
if (fd.getInitExpr() == null) {
fd.setInitExpr( initVal );
}
fd.setInherited( fieldMap.get( fieldName ).isInherited() );
fd.setOverriding( overriding );
for (String key : fieldMap.get(fieldName).getAnnotationNames()) {
if (fd.getAnnotation( key ) == null) {
fd.addAnnotation( fieldMap.get( fieldName ).getAnnotation( key ) );
}
}
if (fd.getIndex() < 0) {
fd.setIndex( fieldMap.get( fieldName ).getIndex() );
}
}
}
fieldMap.put( fieldName,
typeDescr.getFields().get( fieldName ) );
}
typeDescr.setFields(fieldMap);
}
protected TypeFieldDescr buildInheritedFieldDescrFromDefinition(org.kie.api.definition.type.FactField fld, TypeDeclarationDescr typeDescr) {
TypeFieldDescr inheritedFldDescr = new TypeFieldDescr();
inheritedFldDescr.setFieldName(fld.getName());
inheritedFldDescr.setResource(typeDescr.getResource());
PatternDescr fldType = new PatternDescr();
fldType.setObjectType( ( (FieldDefinition) fld ).getTypeName() );
inheritedFldDescr.setPattern(fldType); // also sets resource for PatternDescr fldType
if (fld.isKey()) {
AnnotationDescr keyAnnotation = new AnnotationDescr(Key.class.getCanonicalName());
keyAnnotation.setFullyQualifiedName(Key.class.getCanonicalName());
keyAnnotation.setResource(typeDescr.getResource());
inheritedFldDescr.addAnnotation(keyAnnotation);
}
inheritedFldDescr.setIndex(((FieldDefinition) fld).getDeclIndex());
inheritedFldDescr.setInherited(true);
String initExprOverride = ((FieldDefinition) fld).getInitExpr();
int overrideCount = 0;
// only @aliasing local fields may override defaults.
for (TypeFieldDescr localField : typeDescr.getFields().values()) {
Alias alias = localField.getTypedAnnotation(Alias.class);
if (alias != null && fld.getName().equals(alias.value().replaceAll("\"", "")) && localField.getInitExpr() != null) {
overrideCount++;
initExprOverride = localField.getInitExpr();
}
}
if (overrideCount > 1) {
// however, only one is allowed
initExprOverride = null;
}
inheritedFldDescr.setInitExpr(initExprOverride);
return inheritedFldDescr;
}
public void addDeclarationToPackagePreservingOrder( TypeDeclaration type,
AbstractClassTypeDeclarationDescr typeDescr,
InternalKnowledgePackage tgtPackage,
Map pkgRegistryMap ) {
Collection parents = taxonomy.get( new QualifiedName( type.getFullName() ) );
int index = getSortedDescriptors().indexOf( typeDescr );
if ( parents != null && ! parents.isEmpty() ) {
for ( QualifiedName parentName : parents ) {
String nameSpace = parentName.getNamespace();
String name = parentName.getName();
PackageRegistry parentPkgRegistry = pkgRegistryMap.get( nameSpace );
if ( parentPkgRegistry != null ) {
TypeDeclaration parentDeclaration = parentPkgRegistry.getPackage().getTypeDeclaration( name );
if ( parentDeclaration != null && parentDeclaration.getNature() == TypeDeclaration.Nature.DEFINITION ) {
index = Math.max( index, parentDeclaration.getOrder() );
}
}
}
}
type.setOrder( index + 1 );
tgtPackage.addTypeDeclaration( type );
}
}
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