/**
 *
 * Copyright (c) 2006-2019, Speedment, Inc. 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 com.speedment.common.injector.internal.execution;

import com.speedment.common.injector.State;
import com.speedment.common.injector.annotation.ExecuteBefore;
import com.speedment.common.injector.dependency.Dependency;
import com.speedment.common.injector.exception.NotInjectableException;
import com.speedment.common.injector.execution.Execution;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;

import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;

/**
 * An implementation of {@link Execution} that uses reflection to invoke a 
 * method.
 * 
 * @param <T>  the component to execute on
 * 
 * @author  Emil Forslund
 * @since   1.2.0
 */
public final class ReflectionExecutionImpl<T> extends AbstractExecution<T> {

    private final Method method;
    private final boolean doNotThrowIfMissingDependencies;

    public ReflectionExecutionImpl(
            Class<T> component,
            State state,
            Set<Dependency> dependencies,
            Method method) {
        
        super(component, state, dependencies);
        this.method = requireNonNull(method);
        this.doNotThrowIfMissingDependencies =
            Optional.ofNullable(method.getAnnotation(ExecuteBefore.class))
                .filter(ExecuteBefore::orThrow).isPresent();
    }

    @Override
    public void invoke(T component, ClassMapper classMapper) 
    throws IllegalAccessException, 
           IllegalArgumentException, 
           InvocationTargetException, 
           NotInjectableException {

        if (doNotThrowIfMissingDependencies) {
            if (Stream.of(method.getParameters())
                .map(Parameter::getType)
                .map(classMapper::applyOrNull)
                .allMatch(Objects::isNull)
            ) {
                // Do not invoke if all arguments are optional
                // and the arguments are all null
                return;
            }
        }

        final Object[] args = Stream.of(method.getParameters())
            .map(Parameter::getType)
            .map(classMapper::apply)
            .toArray();
        
        method.setAccessible(true);
        method.invoke(component, args);
    }

    @Override
    public String toString() {
        return getType().getSimpleName() + "#"
            + method.getName() + "("
            + Stream.of(method.getParameters())
            .map(p -> p.getType().getSimpleName().substring(0, 1))
            .collect(joining(", ")) + ")";
    }
}
@@ -2395,16 +2395,50 @@
 ndencies
+ && method.getParameterCount() %3E 0
 ) %7B%0A    
@@ -2613,29 +2613,16 @@
 :isNull)
-%0A            
 ) %7B%0A    

Fix bug when optional execution has no parameters