/*
* 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.apache.deltaspike.core.util.metadata.builder;
import org.apache.deltaspike.core.util.metadata.builder.ParameterValueRedefiner.ParameterValue;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InjectionPoint;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import static org.apache.deltaspike.core.util.BeanUtils.createInjectionPoints;
import static org.apache.deltaspike.core.util.ReflectionUtils.invokeMethod;
/**
* <p>
* Allows an {@link AnnotatedMethod} to be injected using the CDI type safe
* resolution rules.
* </p>
* <p/>
* <p>
* {@link ParameterValueRedefiner} allows the default value to be overridden by
* the caller of
* {@link #invoke(Object, CreationalContext, ParameterValueRedefiner)}.
* </p>
*
* @param <X> the declaring type
*/
public class InjectableMethod<X>
{
private final AnnotatedMethod<X> method;
private final List<InjectionPoint> parameters;
private final BeanManager beanManager;
/**
* Instantiate a new {@link InjectableMethod}.
*
* @param method the method which will be injected upon a call to
* {@link #invoke(Object, CreationalContext)}
* @param declaringBean the bean which defines the injectable method
* @param beanManager the {@link BeanManager} to use to obtain the parameter values
*/
public InjectableMethod(AnnotatedMethod<X> method, Bean<?> declaringBean, BeanManager beanManager)
{
this(method, createInjectionPoints(method, declaringBean, beanManager), beanManager);
}
/**
* Instantiate a new {@link InjectableMethod}.
*
* @param method the method which will be injected upon a call to
* {@link #invoke(Object, CreationalContext)}
* @param parameters a collection of injection points representing the
* parameters of the method
* @param beanManager the {@link BeanManager} to use to obtain the parameter
* values
*/
public InjectableMethod(AnnotatedMethod<X> method, Collection<InjectionPoint> parameters, BeanManager beanManager)
{
this.method = method;
this.parameters = new ArrayList<InjectionPoint>(parameters);
this.beanManager = beanManager;
}
/**
* Get the bean manager used by this injectable method.
*
* @return the bean manager in use
*/
protected BeanManager getBeanManager()
{
return beanManager;
}
/**
* Get the injectable parameters of this method.
*
* @return a collection of injection points representing the parameters of
* this method
*/
protected List<InjectionPoint> getParameters()
{
return parameters;
}
/**
* Invoke the method, causing all parameters to be injected according to the
* CDI type safe resolution rules.public class ParameterValueRedefiner {
* <p/>
* }
*
* @param <T> the return type of the method
* @param receiver the instance upon which to call the method
* @param creationalContext the creational context to use to obtain
* injectable references for each parameter
* @return the result of invoking the method or null if the method's return
* type is void
* @throws RuntimeException if this <code>Method</code> object enforces Java
* language access control and the underlying method is
* inaccessible or if the underlying method throws an exception or
* if the initialization provoked by this method fails.
* @throws IllegalArgumentException if the method is an instance method and
* the specified <code>receiver</code> argument is not an instance
* of the class or interface declaring the underlying method (or
* of a subclass or implementor thereof); if an unwrapping
* conversion for primitive arguments fails; or if, after possible
* unwrapping, a parameter value cannot be converted to the
* corresponding formal parameter type by a method invocation
* conversion.
* @throws NullPointerException if the specified <code>receiver</code> is
* null and the method is an instance method.
* @throws ExceptionInInitializerError if the initialization provoked by this
* method fails.
*/
public <T> T invoke(Object receiver, CreationalContext<T> creationalContext)
throws IllegalAccessException, IllegalArgumentException
{
return invoke(receiver, creationalContext, null);
}
/**
* Invoke the method, calling the parameter redefiner for each parameter,
* allowing the caller to override the default value obtained via the CDI
* type safe resolver.
*
* @param <T> the return type of the method
* @param receiver the instance upon which to call the method
* @param creationalContext the creational context to use to obtain
* injectable references for each parameter
* @return the result of invoking the method or null if the method's return
* type is void
* @throws RuntimeException if this <code>Method</code> object enforces Java
* language access control and the underlying method is
* inaccessible or if the underlying method throws an exception or
* if the initialization provoked by this method fails.
* @throws IllegalArgumentException if the method is an instance method and
* the specified <code>receiver</code> argument is not an instance
* of the class or interface declaring the underlying method (or
* of a subclass or implementor thereof); if an unwrapping
* conversion for primitive arguments fails; or if, after possible
* unwrapping, a parameter value cannot be converted to the
* corresponding formal parameter type by a method invocation
* conversion.
* @throws NullPointerException if the specified <code>receiver</code> is
* null and the method is an instance method.
* @throws ExceptionInInitializerError if the initialization provoked by this
* method fails.
*/
public <T> T invoke(Object receiver, CreationalContext<T> creationalContext, ParameterValueRedefiner redefinition)
throws IllegalAccessException, IllegalArgumentException
{
List<Object> parameterValues = new ArrayList<Object>();
for (int i = 0; i < getParameters().size(); i++)
{
if (redefinition != null)
{
ParameterValue value = new ParameterValue(i, getParameters().get(i), getBeanManager());
parameterValues.add(redefinition.redefineParameterValue(value));
}
else
{
parameterValues.add(getBeanManager().getInjectableReference(getParameters().get(i), creationalContext));
}
}
try
{
@SuppressWarnings({ "unchecked", "UnnecessaryLocalVariable" })
T result =
(T) invokeMethod(receiver, method.getJavaMember(), Object.class, true, parameterValues.toArray());
return result;
}
catch (RuntimeException e)
{
//X TODO check if it is compatible with Weld
//workaround for OWB which wraps InvocationTargetException the original exception
//see ReflectionUtils#invokeMethod
if (RuntimeException.class.getName().equals(e.getClass().getName()) &&
e.getCause() instanceof RuntimeException)
{
throw (RuntimeException) e.getCause();
}
throw e;
}
}
}