/*
* 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.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.qi4j.api.util.Classes;
import org.qi4j.bootstrap.BindingException;
import org.qi4j.functional.Function;
import org.qi4j.functional.HierarchicalVisitor;
import org.qi4j.functional.HierarchicalVisitorAdapter;
import org.qi4j.functional.Specification;
import org.qi4j.functional.VisitableHierarchy;
import org.qi4j.runtime.injection.DependencyModel;
import org.qi4j.runtime.injection.InjectedFieldModel;
import org.qi4j.runtime.model.Binder;
import org.qi4j.runtime.model.Resolution;
import static org.qi4j.api.util.Classes.interfacesOf;
import static org.qi4j.functional.Iterables.filter;
import static org.qi4j.functional.Iterables.flattenIterables;
import static org.qi4j.functional.Iterables.map;
/**
* Base implementation of model for mixins. This records the mapping between methods in the Composite
* and mixin implementations.
*/
public class MixinsModel
implements Binder, VisitableHierarchy<Object, Object>
{
protected final Map<Method, MixinModel> methodImplementation = new HashMap<Method, MixinModel>();
protected final Map<Method, Integer> methodIndex = new HashMap<Method, Integer>();
protected List<MixinModel> mixinModels = new ArrayList<MixinModel>();
private final Map<Class, Integer> mixinIndex = new HashMap<Class, Integer>();
private final Set<Class<?>> mixinTypes = new LinkedHashSet<Class<?>>();
public Iterable<Class<?>> mixinTypes()
{
return mixinTypes;
}
public <T> boolean isImplemented( Class<T> mixinType )
{
return mixinTypes.contains( mixinType );
}
public List<MixinModel> mixinModels()
{
return mixinModels;
}
public MixinModel mixinFor( Method method )
{
return methodImplementation.get( method );
}
public MixinModel getMixinModel( Class mixinClass )
{
for( MixinModel mixinModel : mixinModels )
{
if( mixinModel.mixinClass().equals( mixinClass ) )
{
return mixinModel;
}
}
return null;
}
public void addMixinType( Class mixinType )
{
for( Type type : interfacesOf( mixinType ) )
{
mixinTypes.add( Classes.RAW_CLASS.map( type ) );
}
}
public void addMixinModel( MixinModel mixinModel )
{
mixinModels.add( mixinModel );
}
public void addMethodMixin( Method method, MixinModel mixinModel )
{
methodImplementation.put( method, mixinModel );
}
@Override
public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
throws ThrowableType
{
if( visitor.visitEnter( this ) )
{
for( MixinModel mixinModel : mixinModels )
{
mixinModel.accept( visitor );
}
}
return visitor.visitLeave( this );
}
// Binding
@Override
public void bind( final Resolution resolution )
throws BindingException
{
// Order mixins based on @This usages
UsageGraph<MixinModel> deps = new UsageGraph<MixinModel>( mixinModels, new Uses(), true );
mixinModels = deps.resolveOrder();
// Populate mappings
for( int i = 0; i < mixinModels.size(); i++ )
{
MixinModel mixinModel = mixinModels.get( i );
mixinIndex.put( mixinModel.mixinClass(), i );
}
for( Map.Entry<Method, MixinModel> methodClassEntry : methodImplementation.entrySet() )
{
methodIndex.put( methodClassEntry.getKey(), mixinIndex.get( methodClassEntry.getValue().mixinClass() ) );
}
for( MixinModel mixinModel : mixinModels )
{
mixinModel.accept( new HierarchicalVisitorAdapter<Object, Object, BindingException>()
{
@Override
public boolean visitEnter( Object visited )
throws BindingException
{
if( visited instanceof InjectedFieldModel )
{
InjectedFieldModel fieldModel = (InjectedFieldModel) visited;
fieldModel.bind( resolution.forField( fieldModel.field() ) );
return false;
}
else if( visited instanceof Binder )
{
Binder constructorsModel = (Binder) visited;
constructorsModel.bind( resolution );
return false;
}
return true;
}
@Override
public boolean visit( Object visited )
throws BindingException
{
if( visited instanceof Binder )
{
( (Binder) visited ).bind( resolution );
}
return true;
}
} );
}
}
// Context
public Object[] newMixinHolder()
{
return new Object[ mixinIndex.size() ];
}
public FragmentInvocationHandler newInvocationHandler( final Method method )
{
return mixinFor( method ).newInvocationHandler( method );
}
public Iterable<DependencyModel> dependencies()
{
return flattenIterables( map( new Function<MixinModel, Iterable<DependencyModel>>()
{
@Override
public Iterable<DependencyModel> map( MixinModel mixinModel )
{
return mixinModel.dependencies();
}
}, mixinModels ) );
}
public Iterable<Method> invocationsFor( final Class<?> mixinClass )
{
return map( new Function<Map.Entry<Method, MixinModel>, Method>()
{
@Override
public Method map( Map.Entry<Method, MixinModel> entry )
{
return entry.getKey();
}
}, filter( new Specification<Map.Entry<Method, MixinModel>>()
{
@Override
public boolean satisfiedBy( Map.Entry<Method, MixinModel> item )
{
MixinModel model = item.getValue();
return model.mixinClass().equals( mixinClass );
}
}, methodImplementation.entrySet() ) );
}
private class Uses
implements UsageGraph.Use<MixinModel>
{
@Override
public Collection<MixinModel> uses( MixinModel source )
{
Iterable<Class<?>> thisMixinTypes = source.thisMixinTypes();
List<MixinModel> usedMixinClasses = new ArrayList<MixinModel>();
for( Class thisMixinType : thisMixinTypes )
{
for( Method method : thisMixinType.getMethods() )
{
usedMixinClasses.add( methodImplementation.get( method ) );
}
}
return usedMixinClasses;
}
}
}