/**
*
* Copyright
* 2009-2015 Jayway Products AB
* 2016-2017 Föreningen Sambruk
*
* Licensed under AGPL, Version 3.0 (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.gnu.org/licenses/agpl.txt
*
* 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 se.streamsource.streamflow.web.domain.generic;
import java.beans.Introspector;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.qi4j.api.common.AppliesTo;
import org.qi4j.api.common.AppliesToFilter;
import org.qi4j.api.injection.scope.State;
import org.qi4j.api.property.StateHolder;
import se.streamsource.streamflow.infrastructure.event.domain.DomainEvent;
/**
* Generic mixin for simple event methods that update a property. They have to follow this pattern:
* void changedFoo(DomainEvent event, SomeType newValue)
* This will cause the property "foo" to be updated with the "newValue"
*/
@AppliesTo(EventPropertyChangedMixin.EventPropertyChangeAppliesTo.class)
public class EventPropertyChangedMixin
implements InvocationHandler
{
private static Map<Method, Method> methodMappings = new ConcurrentHashMap<Method, Method>();
@State
StateHolder state;
public Object invoke( Object proxy, Method method, Object[] args ) throws Throwable
{
Method propertyMethod = methodMappings.get( method );
if (propertyMethod == null)
{
// Find property method
String propName = Introspector.decapitalize( method.getName().substring( "changed".length() ) );
propertyMethod = method.getDeclaringClass().getMethod( propName );
methodMappings.put( method, propertyMethod );
}
// Update property
state.getProperty( propertyMethod ).set( args[1] );
return null;
}
public static class EventPropertyChangeAppliesTo
implements AppliesToFilter
{
public boolean appliesTo( Method method, Class<?> mixin, Class<?> compositeType, Class<?> fragmentClass )
{
return method.getParameterTypes().length == 2 && method.getParameterTypes()[0].equals( DomainEvent.class ) && method.getName().startsWith( "changed" );
}
}
}