001// Copyright 2010, 2011 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.internal.transform; 016 017import org.apache.tapestry5.runtime.ComponentEvent; 018 019/** 020 * Supplies one parameter value when invoking a component event handler method. In general, 021 * this involves extracting a value form the event's context and coercing it to a type 022 * appropriate to the parameter. 023 * <p/> 024 * These values are accumulated and used to invoke the event handler method. 025 * 026 * @since 5.2.0 027 */ 028public interface EventHandlerMethodParameterProvider 029{ 030 /** 031 * Extract the value and coerce it to the correct type. 032 * 033 * @return value that can be passed as a method parameter 034 */ 035 Object valueForEventHandlerMethodParameter(ComponentEvent event); 036}