001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.lib;
016    
017    /**
018     * Service interface for performing name lookups.  This is typically
019     * implemented as a wrapper around JNDI.  This service is available
020     * as <code>hivemind.lib.NameLookup</code>.
021     *
022     * @author Howard Lewis Ship
023     */
024    
025    public interface NameLookup
026    {
027        /**
028         * Performs the lookup, returning the object that was found.
029         * 
030         * @param name the name to lookup
031         * @param expected the expected class of the object; the object found must be assignable
032         * to this class (which may be a class or interface)
033         * @throws org.apache.tapestry.ApplicationRuntimeException if an error occurs during
034         * the lookup, or if the found object can not be assigned to the expected class.
035         */
036        public Object lookup(String name, Class expected);
037    }