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/* 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.flowable.cdi.impl.util;

import javax.enterprise.inject.spi.BeanManager;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.flowable.engine.common.api.FlowableException;

public class BeanManagerLookup {

    /** holds a local beanManager if no jndi is available */
    public static BeanManager localInstance;

    /** provide a custom jndi lookup name */
    public static String jndiName;

    public static BeanManager getBeanManager() {
        if (localInstance != null) {
            return localInstance;
        }
        return lookupBeanManagerInJndi();
    }

    private static BeanManager lookupBeanManagerInJndi() {

        if (jndiName != null) {
            try {
                return (BeanManager) InitialContext.doLookup(jndiName);
            } catch (NamingException e) {
                throw new FlowableException("Could not lookup beanmanager in jndi using name: '" + jndiName + "'.", e);
            }
        }

        try {
            // in an application server
            return (BeanManager) InitialContext.doLookup("java:comp/BeanManager");
        } catch (NamingException e) {
            // silently ignore
        }

        try {
            // in a servlet container
            return (BeanManager) InitialContext.doLookup("java:comp/env/BeanManager");
        } catch (NamingException e) {
            // silently ignore
        }

        throw new FlowableException("Could not lookup beanmanager in jndi. If no jndi is available, set the beanmanger to the 'localInstance' property of this class.");
    }
}