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package com.sun.enterprise.deployment.annotation.handlers;

import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;

import javax.ejb.Stateless;

import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.EjbSessionDescriptor;

import com.sun.enterprise.deployment.annotation.AnnotationInfo;
import com.sun.enterprise.deployment.annotation.AnnotationProcessorException;
import com.sun.enterprise.deployment.annotation.HandlerProcessingResult;

/**
 * This handler is responsible for handling the javax.ejb.Stateless
 *
 * @author Shing Wai Chan
 */
public class StatelessHandler extends AbstractEjbHandler {
    
    /** Creates a new instance of StatelessHandler */
    public StatelessHandler() {
    }
    
    /**
     * @return the annoation type this annotation handler is handling
     */
    public Class<? extends Annotation> getAnnotationType() {
        return Stateless.class;
    }

    /**
     * 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) {
        return EjbSessionDescriptor.TYPE.equals(ejbDesc.getType());
    }

    /**
     * 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;
        ejbSessionDesc.setStateless(true);

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

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

        return setBusinessAndHomeInterfaces(ejbDesc, ainfo);
    }
}