/**
* Copyright (C) 2008 Google Inc.
*
* 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 com.google.inject;
import com.google.common.collect.ImmutableList;
import com.google.inject.InjectorImpl.MethodInvoker;
import com.google.inject.internal.BytecodeGen.Visibility;
import static com.google.inject.internal.BytecodeGen.newFastClass;
import com.google.inject.internal.Errors;
import com.google.inject.internal.ErrorsException;
import com.google.inject.internal.InternalContext;
import com.google.inject.spi.InjectionPoint;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import net.sf.cglib.reflect.FastClass;
import net.sf.cglib.reflect.FastMethod;
/**
* Invokes an injectable method.
*/
class SingleMethodInjector implements SingleMemberInjector {
final MethodInvoker methodInvoker;
final ImmutableList<SingleParameterInjector<?>> parameterInjectors;
final InjectionPoint injectionPoint;
public SingleMethodInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)
throws ErrorsException {
this.injectionPoint = injectionPoint;
final Method method = (Method) injectionPoint.getMember();
// We can't use FastMethod if the method is private.
int modifiers = method.getModifiers();
if (Modifier.isPrivate(modifiers) || Modifier.isProtected(modifiers)) {
method.setAccessible(true);
methodInvoker = new MethodInvoker() {
public Object invoke(Object target, Object... parameters)
throws IllegalAccessException, InvocationTargetException {
return method.invoke(target, parameters);
}
};
} else {
FastClass fastClass = newFastClass(method.getDeclaringClass(), Visibility.forMember(method));
final FastMethod fastMethod = fastClass.getMethod(method);
methodInvoker = new MethodInvoker() {
public Object invoke(Object target, Object... parameters)
throws IllegalAccessException, InvocationTargetException {
return fastMethod.invoke(target, parameters);
}
};
}
parameterInjectors = injector.getParametersInjectors(injectionPoint.getDependencies(), errors);
}
public InjectionPoint getInjectionPoint() {
return injectionPoint;
}
public void inject(Errors errors, InternalContext context, Object o) {
Object[] parameters;
try {
parameters = SingleParameterInjector.getAll(errors, context, parameterInjectors);
} catch (ErrorsException e) {
errors.merge(e.getErrors());
return;
}
try {
methodInvoker.invoke(o, parameters);
} catch (IllegalAccessException e) {
throw new AssertionError(e); // a security manager is blocking us, we're hosed
} catch (InvocationTargetException userException) {
Throwable cause = userException.getCause() != null
? userException.getCause()
: userException;
errors.withSource(injectionPoint).errorInjectingMethod(cause);
}
}
}