| /* |
| * Copyright (c) 2010, Rickard Öberg. All Rights Reserved. |
| * |
| * 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.apache.zest.runtime.bootstrap; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Type; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.zest.api.common.AppliesTo; |
| import org.apache.zest.api.common.AppliesToFilter; |
| import org.apache.zest.api.common.ConstructionException; |
| import org.apache.zest.api.constraint.Constraint; |
| import org.apache.zest.runtime.composite.ConcernModel; |
| import org.apache.zest.runtime.composite.ConstraintDeclaration; |
| import org.apache.zest.runtime.composite.FragmentClassLoader; |
| import org.apache.zest.runtime.composite.MixinModel; |
| import org.apache.zest.runtime.composite.SideEffectModel; |
| |
| /** |
| * This helper is used when building the application model. It keeps track |
| * of already created classloaders and various models |
| */ |
| public class AssemblyHelper |
| { |
| Map<Class, Class> instantiationClasses = new HashMap<>(); |
| Map<Class, ConstraintDeclaration> constraintDeclarations = new HashMap<>(); |
| Map<ClassLoader, FragmentClassLoader> modifierClassLoaders = new HashMap<>(); |
| Map<Class<?>, AppliesToFilter> appliesToInstances = new HashMap<>(); |
| |
| public MixinModel getMixinModel( Class mixinClass ) |
| { |
| return new MixinModel( mixinClass, instantiationClass( mixinClass ) ); |
| } |
| |
| public ConcernModel getConcernModel( Class concernClass ) |
| { |
| return new ConcernModel( concernClass, instantiationClass( concernClass ) ); |
| } |
| |
| public SideEffectModel getSideEffectModel( Class sideEffectClass ) |
| { |
| return new SideEffectModel( sideEffectClass, instantiationClass( sideEffectClass ) ); |
| } |
| |
| private Class instantiationClass( Class fragmentClass ) |
| { |
| Class instantiationClass = fragmentClass; |
| if( !InvocationHandler.class.isAssignableFrom( fragmentClass ) ) |
| { |
| instantiationClass = instantiationClasses.get( fragmentClass ); |
| |
| if( instantiationClass == null ) |
| { |
| try |
| { |
| FragmentClassLoader fragmentLoader = getModifierClassLoader( fragmentClass.getClassLoader() ); |
| instantiationClass = fragmentLoader.loadFragmentClass( fragmentClass ); |
| instantiationClasses.put( fragmentClass, instantiationClass ); |
| } |
| catch( ClassNotFoundException | VerifyError e ) |
| { |
| throw new ConstructionException( "Could not generate mixin subclass " + fragmentClass.getName(), e ); |
| } |
| } |
| } |
| return instantiationClass; |
| } |
| |
| private FragmentClassLoader getModifierClassLoader( ClassLoader classLoader ) |
| { |
| FragmentClassLoader cl = modifierClassLoaders.get( classLoader ); |
| if( cl == null ) |
| { |
| cl = new FragmentClassLoader( classLoader ); |
| modifierClassLoaders.put( classLoader, cl ); |
| } |
| return cl; |
| } |
| |
| public boolean appliesTo( Class<?> fragmentClass, Method method, Iterable<Class<?>> types, Class<?> mixinClass ) |
| { |
| AppliesToFilter appliesToFilter = appliesToInstances.get( fragmentClass ); |
| if( appliesToFilter == null ) |
| { |
| appliesToFilter = createAppliesToFilter( fragmentClass ); |
| appliesToInstances.put( fragmentClass, appliesToFilter ); |
| } |
| for( Class<?> compositeType : types ) |
| { |
| if( appliesToFilter.appliesTo( method, mixinClass, compositeType, fragmentClass ) ) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public AppliesToFilter createAppliesToFilter( Class<?> fragmentClass ) |
| { |
| AppliesToFilter result = null; |
| if( !InvocationHandler.class.isAssignableFrom( fragmentClass ) ) |
| { |
| result = new TypedFragmentAppliesToFilter(); |
| if( Modifier.isAbstract( fragmentClass.getModifiers() ) ) |
| { |
| result = new AndAppliesToFilter( result, new ImplementsMethodAppliesToFilter() ); |
| } |
| } |
| result = applyAppliesTo( result, fragmentClass ); |
| if( result == null ) |
| { |
| return AppliesToFilter.ALWAYS; |
| } |
| return result; |
| } |
| |
| private AppliesToFilter applyAppliesTo( AppliesToFilter existing, Class<?> modifierClass ) |
| { |
| AppliesTo appliesTo = modifierClass.getAnnotation( AppliesTo.class ); |
| if( appliesTo != null ) |
| { |
| // Use "or" for all filters specified in the annotation |
| AppliesToFilter appliesToAnnotation = null; |
| for( Class<?> appliesToClass : appliesTo.value() ) |
| { |
| AppliesToFilter filter; |
| if( AppliesToFilter.class.isAssignableFrom( appliesToClass ) ) |
| { |
| try |
| { |
| filter = (AppliesToFilter) appliesToClass.newInstance(); |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| else if( Annotation.class.isAssignableFrom( appliesToClass ) ) |
| { |
| filter = new AnnotationAppliesToFilter( appliesToClass ); |
| } |
| else // Type check |
| { |
| filter = new TypeCheckAppliesToFilter( appliesToClass ); |
| } |
| |
| if( appliesToAnnotation == null ) |
| { |
| appliesToAnnotation = filter; |
| } |
| else |
| { |
| appliesToAnnotation = new OrAppliesToFilter( appliesToAnnotation, filter ); |
| } |
| } |
| // Add to the rest of the rules using "and" |
| if( existing == null ) |
| { |
| return appliesToAnnotation; |
| } |
| else |
| { |
| return new AndAppliesToFilter( existing, appliesToAnnotation ); |
| } |
| } |
| return existing; |
| } |
| |
| public boolean appliesTo( Class<? extends Constraint<?, ?>> constraint, |
| Class<? extends Annotation> annotationType, |
| Type valueType |
| ) |
| { |
| ConstraintDeclaration constraintDeclaration = constraintDeclarations.get( constraint ); |
| if( constraintDeclaration == null ) |
| { |
| constraintDeclaration = new ConstraintDeclaration( constraint ); |
| constraintDeclarations.put( constraint, constraintDeclaration ); |
| } |
| |
| return constraintDeclaration.appliesTo( annotationType, valueType ); |
| } |
| } |