org.jboss.weld.bootstrap.events.ProcessObserverMethodImpl Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of weld-servlet Show documentation
The newest version!
/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.weld.bootstrap.events;

import static org.jboss.weld.util.Observers.validateObserverMethod;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.List;

import javax.enterprise.inject.spi.AnnotatedMethod;
import javax.enterprise.inject.spi.ObserverMethod;
import javax.enterprise.inject.spi.ProcessObserverMethod;

import org.jboss.weld.experimental.ExperimentalObserverMethod;
import org.jboss.weld.experimental.ExperimentalProcessObserverMethod;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.util.Preconditions;

/**
 * Implementation of the event used to notify observers for each observer
 * method that is added.
 *
 * @author David Allen
 */
public class ProcessObserverMethodImpl extends AbstractDefinitionContainerEvent implements ProcessObserverMethod, ExperimentalProcessObserverMethod {

    public static  ObserverMethod fire(BeanManagerImpl beanManager, AnnotatedMethod beanMethod, ObserverMethod observerMethod) {
        ProcessObserverMethodImpl event = new ProcessObserverMethodImpl(beanManager, beanMethod, observerMethod) {};
        event.fire();
        if (event.vetoed) {
            return null;
        }
        if (event.isDirty()) {
            return event.observerMethod;
        }
        return observerMethod;
    }

    private final AnnotatedMethod beanMethod;
    private final ObserverMethod initialObserverMethod;
    private ObserverMethod observerMethod;
    private boolean vetoed;

    private ProcessObserverMethodImpl(BeanManagerImpl beanManager, AnnotatedMethod beanMethod, ObserverMethod observerMethod) {
        super(beanManager, ExperimentalProcessObserverMethod.class, new Type[]{observerMethod.getObservedType(), observerMethod.getBeanClass()});
        this.beanMethod = beanMethod;
        this.initialObserverMethod = observerMethod;
        this.observerMethod = observerMethod;
    }

    public AnnotatedMethod getAnnotatedMethod() {
        checkWithinObserverNotification();
        return beanMethod;
    }

    public ExperimentalObserverMethod getObserverMethod() {
        checkWithinObserverNotification();
        return (ExperimentalObserverMethod) observerMethod; // TODO remove this cast
    }

    public List getDefinitionErrors() {
        return Collections.unmodifiableList(getErrors());
    }

    @Override
    public void setObserverMethod(ObserverMethod observerMethod) {
        Preconditions.checkArgumentNotNull(observerMethod, "observerMethod");
        checkWithinObserverNotification();
        validateObserverMethod(observerMethod, getBeanManager(), initialObserverMethod);
        this.observerMethod = observerMethod;
    }

    @Override
    public void veto() {
        checkWithinObserverNotification();
        vetoed = true;
    }

    public boolean isDirty() {
        return observerMethod != initialObserverMethod;
    }

}