/**
    * Copyright 2005-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.test;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.kuali.rice.core.framework.resourceloader.SpringResourceLoader;
  import org.springframework.beans.BeansException;
  import org.springframework.beans.factory.BeanFactory;
  import org.springframework.beans.factory.NoSuchBeanDefinitionException;
  
  import java.util.ArrayList;
  import java.util.Collection;
  
  /** 
   * Wraps a collection of bean factories delegating to the inner bean factories.
   * 
   * The first bean factory that returns a non-null/true result is the value that is returned/
   */
  public final class CompositeBeanFactory implements BeanFactory {
  
  	private static final Log LOG = LogFactory.getLog(CompositeBeanFactory.class);
  	
  	private final Collection<BeanFactory> factories;
  	
  	public static BeanFactory createBeanFactory(Collection<? extends SpringResourceLoader> rls) {
  		if (rls == null || rls.isEmpty()) {
  			throw new IllegalArgumentException("rls is null or empty");
  		}
  		
  		final Collection<BeanFactory> bfs = new ArrayList<BeanFactory>();
  		for (SpringResourceLoader rl : rls) {
  			bfs.add(rl.getContext());
  		}
  		return new CompositeBeanFactory(bfs);
  	}
  	
  	public CompositeBeanFactory(Collection<? extends BeanFactory> factories) {
  		if (factories == null || factories.isEmpty()) {
  			throw new IllegalArgumentException("factories is null or empty");
  		}
  		
  		this.factories = new ArrayList<BeanFactory>(factories);
  	}
  
  	@Override
  	public Object getBean(String name) throws BeansException {
  		for (BeanFactory f : factories) {
  			try {
  				Object o = f.getBean(name);
  				if (o != null) {
  					return o;
  				}	
  			} catch (BeansException e) {
  				LOG.debug("bean exception", e);
  			}
  		}
  		return null;
  	}
  
  	@Override
  	public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
  		for (BeanFactory f : factories) {
  			try {
  				T t = f.getBean(name, requiredType);
  				if (t != null) {
  					return t;
  				}	
  			} catch (BeansException e) {
  				LOG.info("bean exception", e);
  			}
  		}
  		return null;
  	}
  
  	@Override
  	public <T> T getBean(Class<T> requiredType) throws BeansException {
  		for (BeanFactory f : factories) {
  			try {
  				T t = f.getBean(requiredType);
  				if (t != null) {
  					return t;
  				}	
  			} catch (BeansException e) {
  				LOG.info("bean exception", e);
  			}
 		}
 		return null;
 	}
 
 	@Override
 	public Object getBean(String name, Object... args) throws BeansException {
 		for (BeanFactory f : factories) {
 			try {
 				Object o = f.getBean(name, args);
 				if (o != null) {
 					return o;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return null;
 	}
 
 	@Override
 	public boolean containsBean(String name) {
 		for (BeanFactory f : factories) {
 			try {
 				boolean b = f.containsBean(name);
 				if (b) {
 					return b;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return false;
 	}
 
 	@Override
 	public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
 		for (BeanFactory f : factories) {
 			try {
 				boolean b = f.isSingleton(name);
 				if (b) {
 					return b;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return false;
 	}
 
 	@Override
 	public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
 		for (BeanFactory f : factories) {
 			try {
 				boolean b = f.isPrototype(name);
 				if (b) {
 					return b;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return false;
 	}
 
 	@Override
 	public boolean isTypeMatch(String name, Class targetType) throws NoSuchBeanDefinitionException {
 		for (BeanFactory f : factories) {
 			try {
 				boolean b = f.isTypeMatch(name, targetType);
 				if (b) {
 					return b;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return false;
 	}
 
 	@Override
 	public Class<?> getType(String name) throws NoSuchBeanDefinitionException {
 		for (BeanFactory f : factories) {
 			try {
 				Class<?> c = f.getType(name);
 				if (c != null) {
 					return c;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return null;
 	}
 
 	@Override
 	public String[] getAliases(String name) {
 		for (BeanFactory f : factories) {
 			try {
 				String[] s = f.getAliases(name);
 				if (s != null) {
 					return s;
 				}	
 			} catch (BeansException e) {
 				LOG.info("bean exception", e);
 			}
 		}
 		return null;
 	}
 }