001    /**
002     * Copyright 2005-2012 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.core;
017    
018    import org.springframework.beans.factory.FactoryBean;
019    
020    /**
021     * The entire purpose of this class is to wrap an otherwise normal bean
022     * whose class is dynamically set at runtime through the PropertyPlaceholderConfigurer
023     * because the <bean> element attributes themselves are not parameterizable,
024     * only the property values. 
025     * @author Kuali Rice Team (rice.collab@kuali.org)
026     */
027    public class BeanHolder implements FactoryBean {
028        private Class clazz;
029        private Object instance;
030    
031        public synchronized Object getObject() throws Exception {
032            if (this.instance == null) {
033                this.instance = this.clazz.newInstance();
034            }
035            return this.instance;
036        }
037    
038        public Class getObjectType() {
039            return this.clazz;
040        }
041    
042        public void setObjectType(Class clazz) {
043            this.clazz = clazz;
044        }
045    
046        public boolean isSingleton() {
047            return true;
048        }
049    }