/*
* 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.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.qi4j.api.common.ConstructionException;
import org.qi4j.api.composite.CompositeDescriptor;
import org.qi4j.api.composite.InvalidCompositeException;
import org.qi4j.api.injection.InjectionScope;
import org.qi4j.api.injection.scope.Uses;
import org.qi4j.api.util.Annotations;
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.Iterables;
import org.qi4j.functional.Specifications;
import org.qi4j.functional.VisitableHierarchy;
import org.qi4j.runtime.injection.Dependencies;
import org.qi4j.runtime.injection.DependencyModel;
import org.qi4j.runtime.injection.InjectedParametersModel;
import org.qi4j.runtime.injection.InjectionContext;
import org.qi4j.runtime.injection.ParameterizedTypeInstance;
import org.qi4j.runtime.model.Binder;
import org.qi4j.runtime.model.Resolution;
import static org.qi4j.functional.Iterables.filter;
import static org.qi4j.functional.Iterables.first;
import static org.qi4j.functional.Iterables.iterable;
/**
* JAVADOC
*/
public final class ConstructorsModel
implements Binder, Dependencies, VisitableHierarchy<Object, Object>
{
@SuppressWarnings( "raw" )
private final Class fragmentClass;
private final List<ConstructorModel> constructorModels;
private List<ConstructorModel> boundConstructors;
@SuppressWarnings( { "raw", "unchecked" } )
public ConstructorsModel( Class fragmentClass )
{
this.fragmentClass = fragmentClass;
validate( fragmentClass );
constructorModels = new ArrayList<>();
Constructor[] realConstructors = this.fragmentClass.getDeclaredConstructors();
Class injectionClass = FragmentClassLoader.getSourceClass( fragmentClass );
for( Constructor constructor : realConstructors )
{
constructor.setAccessible( true );
try
{
Constructor injectionConstructor = injectionClass.getDeclaredConstructor( constructor.getParameterTypes() );
injectionConstructor.setAccessible( true );
ConstructorModel constructorModel = newConstructorModel( this.fragmentClass, constructor,
injectionConstructor );
if( constructorModel != null )
{
constructorModels.add( constructorModel );
}
}
catch( NoSuchMethodException e )
{
// Ignore and continue
e.printStackTrace();
}
}
}
@SuppressWarnings( "raw" )
private void validate( Class fragmentClass )
{
// Ensure that the fragment class is not an inner class, in which case we should give a reasonable exception
if( fragmentClass.getDeclaringClass() == null )
{
return;
}
if( Modifier.isStatic( fragmentClass.getModifiers() ) )
{
return;
}
throw new InvalidCompositeException( "Inner classes can not be used. Use static nested classes instead: " + fragmentClass );
}
@Override
public Iterable<DependencyModel> dependencies()
{
Function<ConstructorModel, Iterable<DependencyModel>> constructorDependencies = new Function<ConstructorModel, Iterable<DependencyModel>>()
{
@Override
public Iterable<DependencyModel> map( ConstructorModel constructorModel )
{
return constructorModel.dependencies();
}
};
return Iterables.flattenIterables( Iterables.map( constructorDependencies, boundConstructors == null ? constructorModels : boundConstructors ) );
}
@SuppressWarnings( "raw" )
private ConstructorModel newConstructorModel( Class fragmentClass,
Constructor realConstructor,
Constructor injectedConstructor
)
{
int idx = 0;
InjectedParametersModel parameters = new InjectedParametersModel();
Annotation[][] parameterAnnotations = injectedConstructor.getParameterAnnotations();
for( Type type : injectedConstructor.getGenericParameterTypes() )
{
Annotation injectionAnnotation = first(
filter( Specifications.translate( Annotations.type(), Annotations.hasAnnotation( InjectionScope.class ) ), iterable( parameterAnnotations[ idx ] ) ) );
if( injectionAnnotation == null )
{
if( fragmentClass.getSuperclass().isMemberClass() )
{
injectionAnnotation = new Uses()
{
@Override
public Class<? extends Annotation> annotationType()
{
return Uses.class;
}
};
}
else
{
return null; // invalid constructor parameter
}
}
boolean optional = DependencyModel.isOptional( injectionAnnotation, parameterAnnotations[ idx ] );
Type genericType = type;
if( genericType instanceof ParameterizedType )
{
genericType = new ParameterizedTypeInstance( ( (ParameterizedType) genericType ).getActualTypeArguments(), ( (ParameterizedType) genericType )
.getRawType(), ( (ParameterizedType) genericType ).getOwnerType() );
for( int i = 0; i < ( (ParameterizedType) genericType ).getActualTypeArguments().length; i++ )
{
Type typeArg = ( (ParameterizedType) genericType ).getActualTypeArguments()[ i ];
if( typeArg instanceof TypeVariable )
{
typeArg = Classes.resolveTypeVariable( (TypeVariable) typeArg, realConstructor.getDeclaringClass(), fragmentClass );
( (ParameterizedType) genericType ).getActualTypeArguments()[ i ] = typeArg;
}
}
}
DependencyModel dependencyModel = new DependencyModel( injectionAnnotation, genericType, fragmentClass, optional,
parameterAnnotations[ idx ] );
parameters.addDependency( dependencyModel );
idx++;
}
return new ConstructorModel( realConstructor, parameters );
}
@Override
public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
throws ThrowableType
{
if( visitor.visitEnter( this ) )
{
if( boundConstructors != null )
{
for( ConstructorModel constructorModel : boundConstructors )
{
if( !constructorModel.accept( visitor ) )
{
break;
}
}
}
else
{
for( ConstructorModel constructorModel : constructorModels )
{
if( !constructorModel.accept( visitor ) )
{
break;
}
}
}
}
return visitor.visitLeave( this );
}
// Binding
@Override
public void bind( final Resolution resolution )
throws BindingException
{
boundConstructors = new ArrayList<>();
for( ConstructorModel constructorModel : constructorModels )
{
try
{
constructorModel.accept( new HierarchicalVisitorAdapter<Object, Object, BindingException>()
{
@Override
public boolean visit( Object visitor )
throws BindingException
{
if( visitor instanceof Binder )
{
( (Binder) visitor ).bind( resolution );
}
return true;
}
} );
boundConstructors.add( constructorModel );
}
catch( Exception e )
{
// Ignore
e.printStackTrace();
}
}
if( boundConstructors.isEmpty() )
{
StringBuilder messageBuilder = new StringBuilder( "Found no constructor that could be bound: " );
if( resolution.model() instanceof CompositeDescriptor )
{
messageBuilder.append( fragmentClass.getName() )
.append( " in " )
.append( resolution.model().toString() );
}
else
{
messageBuilder.append( resolution.model().toString() );
}
if( messageBuilder.indexOf( "$" ) >= 0 )
{
// This could be ok if instance is created manually
return;
// messageBuilder.append( "\nInner classes can not be used." );
}
String message = messageBuilder.toString();
throw new BindingException( message );
}
// Sort based on parameter count
Collections.sort( boundConstructors, new Comparator<ConstructorModel>()
{
@Override
public int compare( ConstructorModel o1, ConstructorModel o2 )
{
Integer model2ParametersCount = o2.constructor().getParameterTypes().length;
int model1ParametersCount = o1.constructor().getParameterTypes().length;
return model2ParametersCount.compareTo( model1ParametersCount );
}
} );
}
public Object newInstance( InjectionContext injectionContext )
{
// Try all bound constructors, in order
ConstructionException exception = null;
for( ConstructorModel constructorModel : boundConstructors )
{
try
{
return constructorModel.newInstance( injectionContext );
}
catch( ConstructionException e )
{
exception = e;
}
}
throw exception;
}
}