001    // Copyright 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.tapestry.enhance;
016    
017    import org.apache.tapestry.spec.InjectSpecification;
018    
019    /**
020     * A kind of enhancement worker dedicated to injection, based on the
021     * <inject> element of the specification. There are different types of
022     * injection which match up to different implementations of this interface
023     * (i.e., the Strategy pattern).
024     * 
025     * @author Howard M. Lewis Ship
026     * @since 4.0
027     * @see org.apache.tapestry.spec.InjectSpecification
028     * @see org.apache.tapestry.enhance.DispatchToInjectWorker
029     */
030    public interface InjectEnhancementWorker
031    {
032    
033        /**
034         * Perform the enhancement defined by the
035         * {@link org.apache.tapestry.spec.InjectSpecification}. Thrown runtime
036         * exceptions are caught and reported by the invoker.
037         *
038         * @param op
039         *          Current enhancement context.
040         * @param spec
041    *              The injection specificiation configuration.
042         */
043        void performEnhancement(EnhancementOperation op, InjectSpecification spec);
044    
045    }