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

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

import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;

import com.sun.enterprise.deployment.EjbDescriptor;

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

/**
 * This handler is responsible for handling the javax.ejb.TransactionManagement.
 *
 * @author Shing Wai Chan
 */
public class TransactionManagementHandler extends AbstractAttributeHandler {
    
    public TransactionManagementHandler() {
    }
    
    /**
     * @return the annoation type this annotation handler is handling
     */
    public Class<? extends Annotation> getAnnotationType() {
        return TransactionManagement.class;
    }    

    protected HandlerProcessingResult processAnnotation(AnnotationInfo ainfo,
            EjbContext[] ejbContexts) throws AnnotationProcessorException {
        
        TransactionManagement tmAn = (TransactionManagement)ainfo.getAnnotation();

        String tmType =
                TransactionManagementType.CONTAINER.equals(tmAn.value())?
                EjbDescriptor.CONTAINER_TRANSACTION_TYPE :
                EjbDescriptor.BEAN_TRANSACTION_TYPE;

        for (EjbContext ejbContext : ejbContexts) {
            EjbDescriptor ejbDesc = ejbContext.getDescriptor();
            // override by xml
            if (ejbDesc.getTransactionType() == null) {
                ejbDesc.setTransactionType(tmType);
            }
        }

        return getDefaultProcessedResult();
    }   

    /**
     * @return an array of annotation types this annotation handler would 
     * require to be processed (if present) before it processes it's own 
     * annotation type.
     */
    public Class<? extends Annotation>[] getTypeDependencies() {
        return getEjbAnnotationTypes();
    }
}