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package com.sun.ejb.containers;

import java.io.Serializable;
import java.lang.reflect.Method;


import javax.ejb.*;
import javax.naming.*;

import com.sun.ejb.*;
import com.sun.enterprise.Switch;

import java.util.logging.*;
import com.sun.logging.*;

import java.io.IOException;

import com.sun.ejb.spi.io.IndirectlySerializable;
import com.sun.ejb.spi.io.SerializableObjectFactory;

/**
 * Implementation of the EJBLocalHome interface.
 * This class is also the base class for all generated concrete EJBLocalHome
 * implementations.
 * At deployment time, one instance of the EJBLocalHome is created
 * for each EJB class in a JAR that has a local home.
 *
 * @author Mahesh Kannan
 */
public abstract class EJBLocalHomeImpl
    implements EJBLocalHome, IndirectlySerializable
{
    protected BaseContainer container;
    private static final Logger _logger =
        LogDomains.getLogger(LogDomains.EJB_LOGGER);
    
    /**
     * Called from BaseContainer only.
     */
    final void setContainer(BaseContainer c) {
        container = c;
    }
    
    /**
     * Called from concrete EJBLocalHome implementation.
     */
    protected final BaseContainer getContainer() {
        return container;
    }

    /**
     * Get the EJBLocalHome corresponding to an EJBLocalHomeImpl.
     * These objects are one and the same when the local home is generated,
     * but distinct in the case of dynamic proxies.  Therefore, code can't
     * assume it can cast an EJBLocalHomeImpl to the EJBLocalHome that
     * the client uses,  and vice-versa.  This is overridden in the 
     * InvocationHandler.
     */
    protected EJBLocalHome getEJBLocalHome() {
        return this;
    }

    /**
     * Create a new EJBLocalObjectImpl and new EJB if necessary.
     * This is called from the concrete "HelloEJBHomeImpl" create method.
     * Return the EJBObjectImpl for the bean.
     */
    protected final EJBLocalObjectImpl createEJBLocalObjectImpl()
        throws CreateException
    {
        return container.createEJBLocalObjectImpl();
    }

    /**
     * Create a new EJBLocalBusinessObjectImpl and new EJB if necessary.
     */
    protected final EJBLocalObjectImpl createEJBLocalBusinessObjectImpl()
        throws CreateException
    {
        return container.createEJBLocalBusinessObjectImpl();
    }
    
    /**
     * This is the implementation of the javax.ejb.EJBLocalHome remove method.
     */
    public final void remove(Object primaryKey)
        throws RemoveException, EJBException
    {
        if ( !(container instanceof EntityContainer) ) {
            // Session beans dont have primary keys. EJB2.0 Section 6.6.
            throw new RemoveException("Attempt to call remove(Object primaryKey) on a session bean.");
        }
        
        container.authorizeLocalMethod(BaseContainer.EJBLocalHome_remove_Pkey);
        
        Method method=null;
        try {
            method = EJBLocalHome.class.getMethod("remove",
                                                  new Class[]{Object.class});
        } catch ( NoSuchMethodException e ) {
            _logger.log(Level.FINE, "Exception in method remove()", e);
        }
        
        try {
            ((EntityContainer)container).removeBean(primaryKey, method, true);
        } catch(java.rmi.RemoteException re) {
            // This should never be thrown for local invocations, but it's
            // part of the removeBean signature.  If for some strange
            // reason it happens, convert to EJBException
            EJBException ejbEx =new EJBException("unexpected RemoteException");
            ejbEx.initCause(re);
            throw ejbEx;
        }
    }
    
    public SerializableObjectFactory getSerializableObjectFactory() {
        return new SerializableLocalHome(
            container.getEjbDescriptor().getUniqueId());
    }

    public static final class SerializableLocalHome
        implements SerializableObjectFactory
    {
        private long ejbId;

        public SerializableLocalHome(long uniqueId) {
            this.ejbId = uniqueId;
        }

        public Object createObject()
            throws IOException
        {
            // Return the LocalHome by getting the target container based
            // on the ejb id.  Note that we can assume this is the
            // LocalHome rather than a LocalBusinessHome since the 
            // LocalBusinessHome is never visible to the application and
            // would never be stored in SFSB state.
            BaseContainer container = (BaseContainer)
                Switch.getSwitch().getContainerFactory().getContainer(ejbId);
            return container.getEJBLocalHome();
        }
    }
}