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package org.glassfish.ejb.deployment.annotation.handlers;

import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import javax.ejb.Stateless;

import org.glassfish.apf.AnnotationHandlerFor;
import org.glassfish.apf.AnnotationInfo;
import org.glassfish.apf.AnnotationProcessorException;
import org.glassfish.apf.HandlerProcessingResult;
import org.glassfish.ejb.deployment.descriptor.EjbDescriptor;
import org.glassfish.ejb.deployment.descriptor.EjbSessionDescriptor;
import org.jvnet.hk2.annotations.Service;

/**
 * This handler is responsible for handling the javax.ejb.Stateless
 *
 * @author Shing Wai Chan
 */
@Service
@AnnotationHandlerFor(Stateless.class)
public class StatelessHandler extends AbstractEjbHandler {
    
    /** Creates a new instance of StatelessHandler */
    public StatelessHandler() {
    }

    /**
     * Return the name attribute of given annotation.
     * @param annotation
     * @return name
     */
    protected String getAnnotatedName(Annotation annotation) {
        Stateless slAn = (Stateless)annotation;
        return slAn.name();
    }

    /**
     * Check if the given EjbDescriptor matches the given Annotation.
     * @param ejbDesc
     * @param annotation
     * @return boolean check for validity of EjbDescriptor
     */
    protected boolean isValidEjbDescriptor(EjbDescriptor ejbDesc,
            Annotation annotation) {
        boolean isValid = EjbSessionDescriptor.TYPE.equals(ejbDesc.getType());

        if( isValid ) {
            EjbSessionDescriptor sessionDesc = (EjbSessionDescriptor) ejbDesc;
            // Only check specific session-bean type if it's set in the descriptor.
            // Otherwise it was probably populated with a sparse ejb-jar.xml and
            // we'll set the type later.
            if( sessionDesc.isSessionTypeSet() && !sessionDesc.isStateless() ) {
                isValid = false;
            }
        }

        return  isValid;
    }

    /**
     * Create a new EjbDescriptor for a given elementName and AnnotationInfo.
     * @param elementName
     * @param ainfo
     * @return a new EjbDescriptor
     */
    protected EjbDescriptor createEjbDescriptor(String elementName,
            AnnotationInfo ainfo) throws AnnotationProcessorException {

        AnnotatedElement ae = ainfo.getAnnotatedElement();
        Class ejbClass = (Class)ae;
        EjbSessionDescriptor newDescriptor = new EjbSessionDescriptor();
        newDescriptor.setName(elementName);
        newDescriptor.setEjbClassName(ejbClass.getName());
        newDescriptor.setSessionType(EjbSessionDescriptor.STATELESS);
        return newDescriptor;
    }

    /**
     * Set Annotation information to Descriptor.
     * This method will also be invoked for an existing descriptor with
     * annotation as user may not specific a complete xml.
     * @param ejbDesc
     * @param ainfo
     * @return HandlerProcessingResult
     */
    protected HandlerProcessingResult setEjbDescriptorInfo(
            EjbDescriptor ejbDesc, AnnotationInfo ainfo)
            throws AnnotationProcessorException {

        EjbSessionDescriptor ejbSessionDesc = (EjbSessionDescriptor)ejbDesc;

         // set session bean type in case it wasn't set in a sparse ejb-jar.xml.
        if( !ejbSessionDesc.isSessionTypeSet() ) {
            ejbSessionDesc.setSessionType(EjbSessionDescriptor.STATELESS);
        }

        Stateless sless = (Stateless) ainfo.getAnnotation();

        doDescriptionProcessing(sless.description(), ejbDesc);
        doMappedNameProcessing(sless.mappedName(), ejbDesc);

        return setBusinessAndHomeInterfaces(ejbDesc, ainfo);
    }
}