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 <inject> element of the
021     * specification. There are different types of injection which match up to different implementations
022     * of this interface (i.e., the Strategy pattern).
023     * 
024     * @author Howard M. Lewis Ship
025     * @since 4.0
026     * @see org.apache.tapestry.spec.InjectSpecification
027     * @see org.apache.tapestry.enhance.DispatchToInjectWorker
028     */
029    public interface InjectEnhancementWorker
030    {
031        /**
032         * Perform the enhancement defined by the {@link org.apache.tapestry.spec.InjectSpecification}.
033         * Thrown runtime exceptions are caught and reported by the invoker.
034         */
035    
036        public void performEnhancement(EnhancementOperation op, InjectSpecification spec);
037    
038    }