| /* |
| * Copyright (c) 2008, 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.qi4j.runtime.composite; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.util.LinkedHashSet; |
| import java.util.Set; |
| import org.qi4j.api.common.ConstructionException; |
| import org.qi4j.api.common.MetaInfo; |
| import org.qi4j.api.common.Visibility; |
| import org.qi4j.api.composite.Composite; |
| import org.qi4j.api.composite.CompositeDescriptor; |
| import org.qi4j.api.composite.InvalidCompositeException; |
| import org.qi4j.functional.HierarchicalVisitor; |
| import org.qi4j.functional.Iterables; |
| import org.qi4j.functional.VisitableHierarchy; |
| import org.qi4j.runtime.injection.Dependencies; |
| import org.qi4j.runtime.injection.DependencyModel; |
| import org.qi4j.runtime.structure.ModuleInstance; |
| |
| import static java.lang.reflect.Proxy.newProxyInstance; |
| import static org.qi4j.functional.Iterables.first; |
| import static org.qi4j.functional.Iterables.toList; |
| |
| /** |
| * JAVADOC |
| */ |
| public abstract class CompositeModel |
| implements VisitableHierarchy<Object, Object>, Dependencies, CompositeDescriptor |
| { |
| protected final MixinsModel mixinsModel; |
| protected final CompositeMethodsModel compositeMethodsModel; |
| private final Set<Class<?>> types; |
| private final Visibility visibility; |
| private final MetaInfo metaInfo; |
| protected final StateModel stateModel; |
| protected Class<? extends Composite> proxyClass; |
| protected Constructor<? extends Composite> proxyConstructor; |
| |
| protected CompositeModel( final Iterable<Class<?>> types, |
| final Visibility visibility, |
| final MetaInfo metaInfo, |
| final MixinsModel mixinsModel, |
| final StateModel stateModel, |
| final CompositeMethodsModel compositeMethodsModel |
| ) |
| { |
| this.types = Iterables.addAll( new LinkedHashSet<Class<?>>(), types ); |
| this.visibility = visibility; |
| this.metaInfo = metaInfo; |
| this.stateModel = stateModel; |
| this.compositeMethodsModel = compositeMethodsModel; |
| this.mixinsModel = mixinsModel; |
| |
| // Create proxy class |
| createProxyClass(); |
| } |
| |
| // Model |
| @Override |
| public Iterable<Class<?>> types() |
| { |
| return types; |
| } |
| |
| public StateModel state() |
| { |
| return stateModel; |
| } |
| |
| @Override |
| public <T> T metaInfo( Class<T> infoType ) |
| { |
| return metaInfo.get( infoType ); |
| } |
| |
| @Override |
| public Visibility visibility() |
| { |
| return visibility; |
| } |
| |
| @Override |
| public boolean isAssignableTo( Class<?> type ) |
| { |
| for( Class<?> aClass : types ) |
| { |
| if( type.isAssignableFrom( aClass ) ) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| @SuppressWarnings( {"raw", "unchecked"} ) |
| public Class<?> primaryType() |
| { |
| Class primaryType = null; |
| for( Class type : mixinTypes() ) |
| { |
| if( type.getName().equals( "scala.ScalaObject" ) ) |
| { |
| continue; |
| } |
| if( primaryType == null ) |
| { |
| primaryType = type; |
| } |
| else if( primaryType.isAssignableFrom( type ) ) |
| { |
| primaryType = type; |
| } |
| } |
| return primaryType; |
| } |
| |
| @Override |
| public Iterable<Class<?>> mixinTypes() |
| { |
| return mixinsModel.mixinTypes(); |
| } |
| |
| @Override |
| public Iterable<DependencyModel> dependencies() |
| { |
| return Iterables.flatten( mixinsModel.dependencies(), compositeMethodsModel.dependencies() ); |
| } |
| |
| @Override |
| public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor ) |
| throws ThrowableType |
| { |
| if( visitor.visitEnter( this ) ) |
| { |
| if( compositeMethodsModel.accept( visitor ) ) |
| { |
| if( stateModel.accept( visitor ) ) |
| { |
| mixinsModel.accept( visitor ); |
| } |
| } |
| } |
| return visitor.visitLeave( this ); |
| } |
| |
| @SuppressWarnings( {"raw", "unchecked"} ) |
| private void createProxyClass() |
| { |
| Class<?> mainType = first( types ); |
| if( mainType.isInterface() ) |
| { |
| ClassLoader proxyClassloader = mainType.getClassLoader(); |
| |
| Class<?>[] interfaces = Iterables.toArray( Class.class, Iterables.<Class>cast( types ) ); |
| proxyClass = (Class<? extends Composite>) ProxyGenerator.createProxyClass( proxyClassloader, interfaces ); |
| |
| try |
| { |
| proxyConstructor = proxyClass.getConstructor( InvocationHandler.class ); |
| } |
| catch( NoSuchMethodException e ) |
| { |
| throw (InvalidCompositeException) new InvalidCompositeException( "Could not get proxy constructor" ).initCause( e ); |
| } |
| proxyConstructor.setAccessible( true ); |
| } |
| else |
| { |
| try |
| { |
| proxyClass = new TransientClassLoader( getClass().getClassLoader() ).loadFragmentClass( mainType ); |
| proxyConstructor = (Constructor<? extends Composite>) proxyClass.getConstructors()[ 0 ]; |
| } |
| catch( ClassNotFoundException e ) |
| { |
| throw (InvalidCompositeException) new InvalidCompositeException( "Could not get proxy constructor" ).initCause( e ); |
| } |
| } |
| } |
| |
| // Context |
| public final Object invoke( MixinsInstance mixins, |
| Object proxy, |
| Method method, |
| Object[] args, |
| ModuleInstance moduleInstance |
| ) |
| throws Throwable |
| { |
| return compositeMethodsModel.invoke( mixins, proxy, method, args, moduleInstance ); |
| } |
| |
| public Composite newProxy( InvocationHandler invocationHandler ) |
| throws ConstructionException |
| { |
| Class<?> mainType = first( types() ); |
| if( mainType.isInterface() ) |
| { |
| |
| try |
| { |
| return Composite.class.cast( proxyConstructor.newInstance( invocationHandler ) ); |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| else |
| { |
| try |
| { |
| Object[] args = new Object[ proxyConstructor.getParameterTypes().length ]; |
| Composite composite = Composite.class.cast( proxyConstructor.newInstance( args ) ); |
| proxyClass.getField( "_instance" ).set( composite, invocationHandler ); |
| return composite; |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| } |
| |
| @SuppressWarnings( "raw" ) |
| public <T> T newProxy( InvocationHandler invocationHandler, Class<T> mixinType ) |
| throws IllegalArgumentException |
| { |
| |
| // if (!matchesAny( isAssignableFrom( mixinType ), types )) |
| if( !mixinsModel.isImplemented( mixinType ) ) |
| { |
| throw new IllegalArgumentException( "Composite " + types().iterator().next() + " does not implement type " + mixinType.getName() ); |
| } |
| |
| // Instantiate proxy for given mixin interface |
| return mixinType.cast( newProxyInstance( mixinType.getClassLoader(), new Class[]{ mixinType }, invocationHandler ) ); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return toList( types ).toString(); |
| } |
| } |