| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.qi4j.runtime.injection.provider; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Proxy; |
| import org.qi4j.api.composite.CompositeDescriptor; |
| import org.qi4j.api.util.Classes; |
| import org.qi4j.bootstrap.InvalidInjectionException; |
| import org.qi4j.functional.Iterables; |
| import org.qi4j.runtime.composite.ProxyGenerator; |
| import org.qi4j.runtime.injection.DependencyModel; |
| import org.qi4j.runtime.injection.InjectionContext; |
| import org.qi4j.runtime.injection.InjectionProvider; |
| import org.qi4j.runtime.injection.InjectionProviderFactory; |
| import org.qi4j.runtime.model.Resolution; |
| |
| import static org.qi4j.functional.Iterables.first; |
| import static org.qi4j.functional.Iterables.iterable; |
| |
| /** |
| * JAVADOC |
| */ |
| public final class ThisInjectionProviderFactory |
| implements InjectionProviderFactory |
| { |
| @Override |
| @SuppressWarnings( "unchecked" ) |
| public InjectionProvider newInjectionProvider( Resolution bindingContext, DependencyModel dependencyModel ) |
| throws InvalidInjectionException |
| { |
| if( bindingContext.model() instanceof CompositeDescriptor ) |
| { |
| // If Composite type then return real type, otherwise use the specified one |
| final Class<?> thisType = dependencyModel.rawInjectionType(); |
| |
| Iterable<Class<?>> injectionTypes = null; |
| if( Classes.assignableTypeSpecification( thisType ).satisfiedBy( bindingContext.model() ) ) |
| { |
| injectionTypes = bindingContext.model().types(); |
| } |
| else |
| { |
| CompositeDescriptor acd = ( (CompositeDescriptor) bindingContext.model() ); |
| for( Class<?> mixinType : acd.mixinTypes() ) |
| { |
| if( thisType.isAssignableFrom( mixinType ) ) |
| { |
| Iterable<? extends Class<?>> iterable = iterable( thisType ); |
| injectionTypes = (Iterable<Class<?>>) iterable; |
| break; |
| } |
| } |
| |
| if( injectionTypes == null ) |
| { |
| throw new InvalidInjectionException( "Composite " + bindingContext.model() |
| + " does not implement @This type " + thisType.getName() + " in fragment " |
| + dependencyModel.injectedClass().getName() ); |
| } |
| } |
| |
| return new ThisInjectionProvider( injectionTypes ); |
| } |
| else |
| { |
| throw new InvalidInjectionException( "Object " + dependencyModel.injectedClass() + " may not use @This" ); |
| } |
| } |
| |
| @SuppressWarnings( {"raw", "unchecked"} ) |
| private static class ThisInjectionProvider |
| implements InjectionProvider |
| { |
| Constructor proxyConstructor; |
| private Class[] interfaces; |
| |
| private ThisInjectionProvider( Iterable<Class<?>> types ) |
| { |
| try |
| { |
| Class proxyClass; |
| if( Proxy.class.isAssignableFrom( first( types ) ) ) |
| { |
| proxyClass = first( types ); |
| } |
| else |
| { |
| Class<?> mainType = first( types ); |
| interfaces = Iterables.toArray( Class.class, Iterables.<Class>cast( types ) ); |
| proxyClass = ProxyGenerator.createProxyClass(mainType.getClassLoader(), interfaces); |
| } |
| |
| proxyConstructor = proxyClass.getConstructor( InvocationHandler.class ); |
| } |
| catch( Exception e ) |
| { |
| // Ignore |
| e.printStackTrace(); |
| } |
| } |
| |
| @Override |
| public Object provideInjection( InjectionContext context ) |
| { |
| try |
| { |
| InvocationHandler handler = context.compositeInstance(); |
| if( handler == null ) |
| { |
| handler = context.proxyHandler(); |
| } |
| return proxyConstructor.newInstance( handler ); |
| } |
| catch( Exception e ) |
| { |
| throw new InjectionProviderException( "Could not instantiate @This proxy", e ); |
| } |
| } |
| } |
| } |