    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
    015package org.apache.tapestry5.commons.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 */
    023public 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}