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 015package org.apache.tapestry.engine.state; 016 017import org.apache.hivemind.ApplicationRuntimeException; 018import org.apache.hivemind.ClassResolver; 019import org.apache.hivemind.impl.BaseLocatable; 020 021/** 022 * Used to instantiate the a state object from a configurable class name. 023 * 024 * @author Howard M. Lewis Ship 025 * @since 4.0 026 */ 027public class NamedClassStateObjectFactory extends BaseLocatable implements StateObjectFactory 028{ 029 private ClassResolver _classResolver; 030 031 private String _className; 032 033 public Object createStateObject() 034 { 035 try 036 { 037 Class c = _classResolver.findClass(_className); 038 039 return c.newInstance(); 040 } 041 catch (Exception ex) 042 { 043 throw new ApplicationRuntimeException(StateMessages.unableToInstantiateObject( 044 _className, 045 ex), getLocation(), ex); 046 } 047 } 048 049 public void setClassName(String className) 050 { 051 _className = className; 052 } 053 054 public String getClassName() 055 { 056 return _className; 057 } 058 059 public void setClassResolver(ClassResolver classResolver) 060 { 061 _classResolver = classResolver; 062 } 063 064 065}