net.camelpe.extension.camel.spi.CdiRegistry.java Source code

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Here is the source code for net.camelpe.extension.camel.spi.CdiRegistry.java

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/**
 * Copyright (C) 2010.
 * Olaf Bergner.
 * Hamburg, Germany. olaf.bergner@gmx.de
 * 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 net.camelpe.extension.camel.spi;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;

import org.apache.camel.spi.Registry;
import org.apache.commons.lang.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * A {@link org.apache.camel.spi.Registry <code>Camel Registry</code>} that delegates
 * to a {@link BeanManager <code>BeanManager</code>}.
 * </p>
 * 
 * @author <a href="mailto:olaf.bergner@saxsys.de">Olaf Bergner</a>
 * 
 */
public class CdiRegistry implements Registry {

    private final Logger log = LoggerFactory.getLogger(getClass());

    private final BeanManager delegate;

    /**
     * @param delegate
     * @throws IllegalArgumentException
     */
    public CdiRegistry(final BeanManager delegate) throws IllegalArgumentException {
        Validate.notNull(delegate, "delegate");
        this.delegate = delegate;
    }

    /**
     * @see org.apache.camel.spi.Registry#lookup(java.lang.String)
     */
    @Override
    public Object lookup(final String name) {
        Validate.notEmpty(name, "name");
        getLog().trace("Looking up bean using name = [{}] in CDI registry ...", name);

        final Set<Bean<?>> beans = getDelegate().getBeans(name);
        if (beans.isEmpty()) {
            getLog().debug("Found no bean matching name = [{}] in CDI registry.", name);
            return null;
        }
        if (beans.size() > 1) {
            throw new IllegalStateException(
                    "Expected to find exactly one bean having name [" + name + "], but got [" + beans.size() + "]");
        }
        final Bean<?> bean = beans.iterator().next();
        getLog().debug("Found bean [{}] matching name = [{}] in CDI registry.", bean, name);

        final CreationalContext<?> creationalContext = getDelegate().createCreationalContext(null);

        return getDelegate().getReference(bean, bean.getBeanClass(), creationalContext);
    }

    /**
     * @see org.apache.camel.spi.Registry#lookup(java.lang.String,
     *      java.lang.Class)
     */
    @Override
    public <T> T lookup(final String name, final Class<T> type) {
        Validate.notEmpty(name, "name");
        Validate.notNull(type, "type");
        getLog().trace("Looking up bean using name = [{}] having expected type = [{}] in CDI registry ...", name,
                type.getName());

        return type.cast(lookup(name));
    }

    /**
     * @see org.apache.camel.spi.Registry#lookupByType(java.lang.Class)
     */
    @Override
    public <T> Map<String, T> lookupByType(final Class<T> type) {
        Validate.notNull(type, "type");
        getLog().trace("Looking up all beans having expected type = [{}] in CDI registry ...", type.getName());

        final Set<Bean<?>> beans = getDelegate().getBeans(type);
        if (beans.isEmpty()) {
            getLog().debug("Found no beans having expected type = [{}] in CDI registry.", type.getName());

            return Collections.emptyMap();
        }
        getLog().debug("Found [{}] beans having expected type = [{}] in CDI registry.",
                Integer.valueOf(beans.size()), type.getName());

        final Map<String, T> beansByName = new HashMap<String, T>(beans.size());
        final CreationalContext<?> creationalContext = getDelegate().createCreationalContext(null);
        for (final Bean<?> bean : beans) {
            beansByName.put(bean.getName(), type.cast(getDelegate().getReference(bean, type, creationalContext)));
        }

        return beansByName;
    }

    @Override
    public String toString() {
        return "CdiRegistry@" + this.hashCode() + "[delegate = " + this.delegate + "]";
    }

    private Logger getLog() {
        return this.log;
    }

    private BeanManager getDelegate() {
        return this.delegate;
    }
}