/*
 *   Copyright 2004 The Apache Software Foundation
 *
 *   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.apache.ldap.server.interceptor;


import java.util.Iterator;
import java.util.Map;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;
import javax.naming.ldap.LdapContext;

import org.apache.ldap.common.filter.ExprNode;
import org.apache.ldap.server.authn.LdapPrincipal;
import org.apache.ldap.server.configuration.InterceptorConfiguration;
import org.apache.ldap.server.invocation.InvocationStack;
import org.apache.ldap.server.jndi.ContextFactoryConfiguration;
import org.apache.ldap.server.jndi.ServerContext;


/**
 * A easy-to-use implementation of {@link Interceptor}.  All methods are
 * implemented to pass the flow of control to next interceptor by defaults.
 * Please override the methods you have concern in.
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 * @version $Rev$, $Date$
 */
public abstract class BaseInterceptor implements Interceptor
{
    /**
     * Returns {@link LdapPrincipal} of current context.
     */
    public static LdapPrincipal getPrincipal()
    {
        ServerContext ctx = ( ServerContext ) getContext();
        return ctx.getPrincipal();
    }
    
    /**
     * Returns the current JNDI {@link Context}.
     */
    public static LdapContext getContext()
    {
        return ( LdapContext ) InvocationStack.getInstance().peek().getCaller();
    }


    /**
     * Creates a new instance.
     */
    protected BaseInterceptor()
    {
    }


    /**
     * This method does nothing by default.
     */
    public void init( ContextFactoryConfiguration factoryCfg, InterceptorConfiguration cfg ) throws NamingException
    {
    }


    /**
     * This method does nothing by default.
     */
    public void destroy()
    {
    }


    // ------------------------------------------------------------------------
    // Interceptor's Invoke Method
    // ------------------------------------------------------------------------

    public void add( NextInterceptor next, String upName, Name normName, Attributes entry ) throws NamingException
    {
        next.add( upName, normName, entry );
    }


    public void delete( NextInterceptor next, Name name ) throws NamingException
    {
        next.delete( name );
    }


    public Name getMatchedName( NextInterceptor next, Name dn, boolean normalized ) throws NamingException
    {
        return next.getMatchedName( dn, normalized );
    }


    public Attributes getRootDSE( NextInterceptor next ) throws NamingException
    {
        return next.getRootDSE();
    }


    public Name getSuffix( NextInterceptor next, Name dn, boolean normalized ) throws NamingException
    {
        return next.getSuffix( dn, normalized );
    }


    public boolean hasEntry( NextInterceptor next, Name name ) throws NamingException
    {
        return next.hasEntry( name );
    }


    public boolean isSuffix( NextInterceptor next, Name name ) throws NamingException
    {
        return next.isSuffix( name );
    }


    public NamingEnumeration list( NextInterceptor next, Name base ) throws NamingException
    {
        return next.list( base );
    }


    public Iterator listSuffixes( NextInterceptor next, boolean normalized ) throws NamingException
    {
        return next.listSuffixes( normalized );
    }


    public Attributes lookup( NextInterceptor next, Name dn, String[] attrIds ) throws NamingException
    {
        return next.lookup( dn, attrIds );
    }


    public Attributes lookup( NextInterceptor next, Name name ) throws NamingException
    {
        return next.lookup( name );
    }


    public void modify( NextInterceptor next, Name name, int modOp, Attributes mods ) throws NamingException
    {
        next.modify( name, modOp, mods );
    }


    public void modify( NextInterceptor next, Name name, ModificationItem[] mods ) throws NamingException
    {
        next.modify( name, mods );
    }


    public void modifyRn( NextInterceptor next, Name name, String newRn, boolean deleteOldRn ) throws NamingException
    {
        next.modifyRn( name, newRn, deleteOldRn );
    }


    public void move( NextInterceptor next, Name oriChildName, Name newParentName, String newRn, boolean deleteOldRn ) throws NamingException
    {
        next.move( oriChildName, newParentName, newRn, deleteOldRn );
    }


    public void move( NextInterceptor next, Name oriChildName, Name newParentName ) throws NamingException
    {
        next.move( oriChildName, newParentName );
    }


    public NamingEnumeration search( NextInterceptor next, Name base, Map env, ExprNode filter, SearchControls searchCtls ) throws NamingException
    {
        return next.search( base, env, filter, searchCtls );
    }
}