001    /**
002     * Copyright 2004-2012 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.hr.sys.context;
017    
018    import org.kuali.hr.sys.util.constants.SpringBeans;
019    import org.springframework.beans.BeansException;
020    import org.springframework.context.ApplicationContext;
021    import org.springframework.context.ApplicationContextAware;
022    
023    /**
024     * helper class for spring beans stuff
025     * 
026     * Copied over from SpringContext.java from the LeaveManager Project
027     */
028    public class SpringContext implements ApplicationContextAware {
029    
030            private static ApplicationContext applicationContext;
031    
032            /**
033             * public constructor that throws exception if you try to instantiate it
034             * twice
035             * 
036             * @throws Exception
037             */
038            public SpringContext() throws Exception {
039                    if (applicationContext != null)
040                            throw new Exception(
041                                            "Cannot instantiate SpringContext twice. Use the static methods");
042            }
043    
044            /*
045             * (non-Javadoc)
046             * 
047             * @see
048             * org.springframework.context.ApplicationContextAware#setApplicationContext
049             * (org.springframework.context.ApplicationContext)
050             */
051            @Override
052            public void setApplicationContext(ApplicationContext applicationContext)
053                            throws BeansException {
054                    SpringContext.applicationContext = applicationContext;
055            }
056    
057            /**
058             * return a spring bean by its name
059             * 
060             * @param beanName
061             * @return
062             */
063            public static Object getBean(SpringBeans bean) {
064                    return applicationContext.getBean(bean.toString());
065            }
066    
067            /**
068             * returns a spring bean by its class... this only works when the class name
069             * equals the spring bean name
070             * 
071             * @param clazz
072             * @return
073             */
074            @SuppressWarnings("unchecked")
075            public static <T> T getBean(Class<T> clazz) {
076                    String[] beanNames = applicationContext.getBeanNamesForType(clazz);
077                    // just return the first one
078                    return (T) applicationContext.getBean(beanNames[0]);
079            }
080    }