001 // Copyright 2004, 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.coerce; 016 017 /** 018 * Converts a value to a specific (implicit) type. 019 * 020 * @author Howard M. Lewis Ship 021 * @since 4.0 022 */ 023 public interface TypeConverter 024 { 025 /** 026 * Converts the value. 027 * 028 * @param value the value to be converted (which may be null) 029 * @return the value converted to a specific type; different implementations of TypeConverter 030 * will return different types. 031 * @throws org.apache.hivemind.ApplicationRuntimeException if the value can not be converted 032 */ 033 Object convertValue(Object value); 034 }