001    // Copyright 2006 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.tapestry5.ioc.services;
016    
017    /**
018     * Responsible for converting from one type to another. This is used primarily around component parameters.
019     *
020     * @param <S> the source type (input)
021     * @param <T> the target type (output)
022     */
023    public interface Coercion<S, T>
024    {
025        /**
026         * Converts an input value.
027         *
028         * @param input the input value
029         */
030        T coerce(S input);
031    }