org.drools.compiler.builder.impl.ClassDefinitionFactory 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.Externalizable;
import java.io.IOException;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
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.EnumDeclarationDescr;
import org.drools.compiler.lang.descr.EnumLiteralDescr;
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.compiler.rule.builder.util.AnnotationFactory;
import org.drools.core.base.TypeResolver;
import org.drools.core.factmodel.AnnotationDefinition;
import org.drools.core.factmodel.ClassDefinition;
import org.drools.core.factmodel.EnumClassDefinition;
import org.drools.core.factmodel.EnumLiteralDefinition;
import org.drools.core.factmodel.FieldDefinition;
import org.drools.core.factmodel.traits.Thing;
import org.drools.core.factmodel.traits.Traitable;
import org.drools.core.factmodel.traits.TraitableBean;
import org.drools.core.rule.TypeDeclaration;
import org.drools.core.util.ClassUtils;
import org.drools.core.util.asm.ClassFieldInspector;
import org.kie.api.definition.type.Key;
import org.kie.api.definition.type.Position;
import org.kie.api.io.Resource;
public class ClassDefinitionFactory {
protected KnowledgeBuilderImpl kbuilder;
public ClassDefinitionFactory( KnowledgeBuilderImpl kbuilder ) {
this.kbuilder = kbuilder;
}
/**
* Generates a bean, and adds it to the composite class loader that
* everything is using.
*/
public ClassDefinition generateDeclaredBean( AbstractClassTypeDeclarationDescr typeDescr,
TypeDeclaration type,
PackageRegistry pkgRegistry,
List unresolvedTypeDefinitions,
Map unprocesseableDescrs ) {
ClassDefinition def = createClassDefinition( typeDescr, type );
boolean success = true;
success &= wireAnnotationDefs( typeDescr, type, def, pkgRegistry.getTypeResolver() );
success &= wireEnumLiteralDefs( typeDescr, type, def );
success &= wireFields( typeDescr, type, def, pkgRegistry, unresolvedTypeDefinitions );
if ( ! success ) {
unprocesseableDescrs.put( typeDescr.getType().getFullName(), typeDescr );
}
// attach the class definition, it will be completed later
type.setTypeClassDef( def );
return def;
}
protected ClassDefinition createClassDefinition( AbstractClassTypeDeclarationDescr typeDescr, TypeDeclaration type ) {
// extracts type, supertype and interfaces
String fullName = typeDescr.getType().getFullName();
if ( type.getKind().equals( TypeDeclaration.Kind.CLASS ) ) {
TypeDeclarationDescr tdescr = (TypeDeclarationDescr) typeDescr;
if (tdescr.getSuperTypes().size() > 1) {
kbuilder.addBuilderResult(new TypeDeclarationError( typeDescr, "Declared class " + fullName + " - has more than one supertype;" ) );
return null;
} else if ( tdescr.getSuperTypes().isEmpty() ) {
tdescr.addSuperType("java.lang.Object");
}
}
Traitable traitableAnn = typeDescr.getTypedAnnotation(Traitable.class);
boolean traitable = traitableAnn != null;
String[] fullSuperTypes = new String[typeDescr.getSuperTypes().size() + 1];
int j = 0;
for (QualifiedName qname : typeDescr.getSuperTypes()) {
fullSuperTypes[j++] = qname.getFullName();
}
fullSuperTypes[j] = Thing.class.getName();
List interfaceList = new ArrayList();
interfaceList.add(traitable ? Externalizable.class.getName() : Serializable.class.getName());
if (traitable) {
interfaceList.add(TraitableBean.class.getName());
}
String[] interfaces = interfaceList.toArray(new String[interfaceList.size()]);
// prepares a class definition
ClassDefinition def;
switch ( type.getKind() ) {
case TRAIT:
def = new ClassDefinition( fullName,
Object.class.getName(),
fullSuperTypes );
break;
case ENUM:
def = new EnumClassDefinition( fullName,
fullSuperTypes[0],
null );
break;
case CLASS:
default:
def = new ClassDefinition( fullName,
fullSuperTypes[0],
interfaces );
def.setTraitable( traitable, traitableAnn != null && traitableAnn.logical() );
}
return def;
}
protected boolean wireAnnotationDefs( AbstractClassTypeDeclarationDescr typeDescr, TypeDeclaration type, ClassDefinition def, TypeResolver resolver ) {
for ( AnnotationDescr annotationDescr : typeDescr.getAnnotations() ) {
Class annotation = null;
try {
annotation = annotationDescr.getFullyQualifiedName() != null ? resolver.resolveType(annotationDescr.getFullyQualifiedName()) : null;
} catch (ClassNotFoundException e) {
continue;
}
if ( annotation != null && annotation.isAnnotation() ) {
try {
AnnotationDefinition annotationDefinition = AnnotationDefinition.build( annotation,
annotationDescr.getValueMap(),
resolver );
def.addAnnotation(annotationDefinition);
} catch (NoSuchMethodException nsme) {
kbuilder.addBuilderResult(new TypeDeclarationError(typeDescr,
"Annotated type " + typeDescr.getType().getFullName() +
" - undefined property in @annotation " +
annotationDescr.getName() + ": " +
nsme.getMessage() + ";"));
}
}
if (annotation == null || annotation.getCanonicalName().startsWith("org.kie.api.definition.type")) {
def.addMetaData(annotationDescr.getName(), annotationDescr.getSingleValue());
}
}
return true;
}
protected boolean wireEnumLiteralDefs( AbstractClassTypeDeclarationDescr typeDescr, TypeDeclaration type, ClassDefinition def ) {
// add enum literals, if appropriate
if ( type.getKind() == TypeDeclaration.Kind.ENUM ) {
for (EnumLiteralDescr lit : ((EnumDeclarationDescr) typeDescr).getLiterals()) {
( (EnumClassDefinition) def ).addLiteral(
new EnumLiteralDefinition( lit.getName(), lit.getConstructorArgs() )
);
}
}
return true;
}
protected boolean wireFields( AbstractClassTypeDeclarationDescr typeDescr,
TypeDeclaration type,
ClassDefinition def,
PackageRegistry pkgRegistry,
List unresolvedTypeDefinitions ) {
// fields definitions are created. will be used by subclasses, if any.
// Fields are SORTED in the process
if ( ! typeDescr.getFields().isEmpty() ) {
if ( unresolvedTypeDefinitions != null && ! unresolvedTypeDefinitions.isEmpty() ) {
for ( TypeFieldDescr fld : typeDescr.getFields().values() ) {
if ( unresolvedTypeDefinitions != null ) {
for ( TypeDefinition typeDef : unresolvedTypeDefinitions ) {
if ( fld.getPattern().getObjectType().equals( typeDef.getTypeClassName() ) ) {
return false;
}
}
}
}
}
List fieldDefs = sortFields( typeDescr.getFields(), pkgRegistry.getTypeResolver(), kbuilder );
int i = 0;
for (FieldDefinition fieldDef : fieldDefs) {
fieldDef.setIndex( i++ );
def.addField( fieldDef );
}
}
return true;
}
private static List sortFields( Map fields,
TypeResolver typeResolver,
KnowledgeBuilderImpl kbuilder ) {
List fieldDefs = new ArrayList(fields.size());
int maxDeclaredPos = 0;
BitSet occupiedPositions = new BitSet(fields.size());
for (TypeFieldDescr field : fields.values()) {
String typeName = field.getPattern().getObjectType();
String typeNameKey = typeName;
String fullFieldType = kbuilder != null ?
TypeDeclarationUtils.toBuildableType( typeNameKey, kbuilder.getRootClassLoader() ) :
typeNameKey;
FieldDefinition fieldDef = new FieldDefinition( field.getFieldName(), fullFieldType );
fieldDefs.add(fieldDef);
if ( field.hasOverride() ) {
fieldDef.setOverriding( field.getOverriding().getPattern().getObjectType() );
}
fieldDef.setInherited( field.isInherited() );
fieldDef.setRecursive( field.isRecursive() );
fieldDef.setInitExpr( TypeDeclarationUtils.rewriteInitExprWithImports( field.getInitExpr(), typeResolver ) );
if (field.getIndex() >= 0) {
int pos = field.getIndex();
occupiedPositions.set(pos);
maxDeclaredPos = Math.max(maxDeclaredPos, pos);
fieldDef.addMetaData("position", pos);
} else {
Position position = field.getTypedAnnotation(Position.class);
if (position != null) {
int pos = position.value();
field.setIndex(pos);
occupiedPositions.set(pos);
maxDeclaredPos = Math.max(maxDeclaredPos, pos);
fieldDef.addMetaData("position", pos);
}
}
if (field.hasAnnotation(Key.class)) {
fieldDef.setKey( true );
fieldDef.addMetaData("key", null);
}
for (AnnotationDescr annotationDescr : field.getAnnotations()) {
if (annotationDescr.getFullyQualifiedName() == null) {
if (annotationDescr.isStrict()) {
kbuilder.addBuilderResult( new TypeDeclarationError( field,
"Unknown annotation @" + annotationDescr.getName() + " on field " + field.getFieldName() ) );
} else {
// Annotation is custom metadata
fieldDef.addMetaData(annotationDescr.getName(), annotationDescr.getSingleValue());
continue;
}
}
Annotation annotation = AnnotationFactory.buildAnnotation(typeResolver, annotationDescr);
if (annotation != null) {
try {
AnnotationDefinition annotationDefinition = AnnotationDefinition.build( annotation.annotationType(),
field.getAnnotation(annotationDescr.getFullyQualifiedName()).getValueMap(),
typeResolver );
fieldDef.addAnnotation( annotationDefinition );
} catch ( Exception e ) {
kbuilder.addBuilderResult( new TypeDeclarationError( field,
"Annotated field " + field.getFieldName() +
" - undefined property in @annotation " +
annotationDescr.getName() + ": " + e.getMessage() + ";" ) );
}
} else {
if (annotationDescr.isStrict()) {
kbuilder.addBuilderResult(new TypeDeclarationError(field,
"Unknown annotation @" + annotationDescr.getName() + " on field " + field.getFieldName()));
}
}
}
fieldDef.setDeclIndex(field.getIndex());
}
int curr = 0;
for (FieldDefinition fieldDef : fieldDefs) {
if (fieldDef.getDeclIndex() < 0) {
int freePos = occupiedPositions.nextClearBit(0);
if (freePos < maxDeclaredPos) {
occupiedPositions.set(freePos);
} else {
freePos = maxDeclaredPos + 1;
}
fieldDef.setPriority(freePos * 256 + curr++);
} else {
fieldDef.setPriority(fieldDef.getDeclIndex() * 256 + curr++);
}
}
Collections.sort(fieldDefs);
return fieldDefs;
}
public static void populateDefinitionFromClass( ClassDefinition def, Resource resource, Class concrete, boolean asTrait ) {
try {
def.setClassName( concrete.getName() );
if ( concrete.getSuperclass() != null ) {
def.setSuperClass( concrete.getSuperclass().getName() );
}
ClassFieldInspector inspector = new ClassFieldInspector(concrete);
Map methods = inspector.getGetterMethods();
Map setters = inspector.getSetterMethods();
int j = 0;
Map fields = new HashMap();
for ( String fieldName : methods.keySet() ) {
if ( asTrait && ( "core".equals(fieldName) || "fields".equals(fieldName) ) ) {
continue;
}
if ( !inspector.isNonGetter( fieldName ) && setters.keySet().contains( fieldName ) ) {
Position position = null;
if ( ! concrete.isInterface() ) {
try {
Field fld = concrete.getDeclaredField( fieldName );
position = fld.getAnnotation( Position.class );
} catch ( NoSuchFieldException nsfe ) {
// @Position can only annotate fields. This x means that a getter/setter pair was found with no field
}
}
Class ret = methods.get( fieldName ).getReturnType();
TypeFieldDescr field = new TypeFieldDescr( );
field.setResource(resource);
field.setFieldName( fieldName );
field.setPattern( new PatternDescr( ret.getName() ) );
field.setIndex( position != null ? position.value() : -1 );
fields.put( fieldName, field );
}
}
if ( ! fields.isEmpty() ) {
List fieldDefs = sortFields( fields, null, null );
int i = 0;
for (FieldDefinition fieldDef : fieldDefs) {
fieldDef.setIndex( i++ );
def.addField( fieldDef );
}
}
Set interfaces = new HashSet();
Collections.addAll( interfaces, def.getInterfaces() );
for ( Class iKlass : ClassUtils.getAllImplementedInterfaceNames( concrete ) ) {
interfaces.add(iKlass.getName());
}
def.setInterfaces( interfaces.toArray( new String[ interfaces.size() ] ) );
def.setDefinedClass( concrete );
} catch (IOException e) {
e.printStackTrace();
}
}
}
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