org.apache.deltaspike.core.impl.message.TypedMessageBundleProducer Maven / Gradle / Ivy

/*
 * 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.impl.message;


import java.io.Serializable;
import java.lang.reflect.Proxy;

import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.InjectionPoint;

import org.apache.deltaspike.core.util.ClassUtils;
import org.apache.deltaspike.core.util.ReflectionUtils;

/**
 * The TypedMessageBundleProducer provides a producer method for
 * injected typed message bundles.
 */
public class TypedMessageBundleProducer implements Serializable
{
    private static final long serialVersionUID = -5077306523543940760L;
    private static final String JAVA_PACKAGE = "java.";

    @Produces
    @Dependent
    @TypedMessageBundle
    @SuppressWarnings("UnusedDeclaration")
    Object produceTypedMessageBundle(InjectionPoint injectionPoint, MessageBundleInvocationHandler handler)
    {
        return createMessageBundleProxy(ReflectionUtils.getRawType(injectionPoint.getType()), handler);
    }

    @Produces
    @Dependent
    @NamedTypedMessageBundle
    @SuppressWarnings("UnusedDeclaration")
    Object produceTypedMessageBundle(NamedMessageBundleInvocationHandler handler)
    {
        Bean currentMessageBundleContextBean = MessageBundleContext.getCurrentMessageBundleBean();
        Class type = extractCustomType(currentMessageBundleContextBean);
        handler.setTargetType(type);
        return createMessageBundleProxy(type, handler);
    }

    private Class extractCustomType(Bean currentMessageBundleBean)
    {
        for (Object type : currentMessageBundleBean.getTypes())
        {
            if (type instanceof Class && !((Class)type).getName().startsWith(JAVA_PACKAGE))
            {
                return (Class)type;
            }
        }
        throw new IllegalStateException("no custom type found for bean: " + currentMessageBundleBean.toString());
    }

    private  T createMessageBundleProxy(Class type, MessageBundleInvocationHandler handler)
    {
        return type.cast(Proxy.newProxyInstance(ClassUtils.getClassLoader(null),
                new Class[]{type}, handler));
    }
}