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Using Camel with CDI
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/*
 * 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.camel.cdi;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

import javax.enterprise.inject.Vetoed;
import javax.enterprise.inject.spi.BeanManager;

import org.apache.camel.RuntimeCamelException;
import org.apache.camel.spi.Injector;

import static org.apache.camel.cdi.BeanManagerHelper.getReferenceByType;

@Vetoed
final class CdiCamelInjector implements Injector {

    private final Injector injector;

    private final BeanManager manager;

    CdiCamelInjector(Injector injector, BeanManager manager) {
        this.injector = injector;
        this.manager = manager;
    }

    @Override
    public  T newInstance(Class type) {
        return newInstance(type, true);
    }

    @Override
    public  T newInstance(Class type, String factoryMethod) {
        T answer = null;
        try {
            // lookup factory method
            Method fm = type.getMethod(factoryMethod);
            if (Modifier.isStatic(fm.getModifiers()) && Modifier.isPublic(fm.getModifiers()) && fm.getReturnType() == type) {
                Object obj = fm.invoke(null);
                answer = type.cast(obj);
            }
        } catch (Exception e) {
            throw new RuntimeCamelException("Error invoking factory method: " + factoryMethod + " on class: " + type, e);
        }
        return answer;
    }

    @Override
    public  T newInstance(Class type, boolean postProcessBean) {
        return getReferenceByType(manager, type)
                .orElseGet(() -> injector.newInstance(type, postProcessBean));
    }

    @Override
    public boolean supportsAutoWiring() {
        // TODO: cdi to support some kind of @Inject on constructors?
        return false;
    }
}