/**
    * Copyright 2010 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.osedu.org/licenses/ECL-2.0
    *
    * 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.student.common.validator;
  
  import java.beans.BeanInfo;
  import java.beans.IntrospectionException;
  import java.beans.Introspector;
  import java.beans.PropertyDescriptor;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.log4j.Logger;
  
  public class BeanConstraintDataProvider implements ConstraintDataProvider {
      final static Logger LOG = Logger.getLogger(BeanConstraintDataProvider.class);
      
      private static final String DYNAMIC_ATTRIBUTE = "attributes";
      
  	Map<String, Object> dataMap = null;
  
  	/*
  	 * The only place where the dataprovider should get initialized is
  	 * BeanConstraintSetupFactory
  	 */
  	public BeanConstraintDataProvider() {
  
  	}
  	
  	//TODO fix it later. 
      public String getPath(){
          return "";
      }
  	
      @SuppressWarnings("unchecked")
      @Override
  	public void initialize(Object o) {
  
  		dataMap = new HashMap<String, Object>();
  		
  		try {
  			BeanInfo beanInfo = Introspector.getBeanInfo(o.getClass());
  		
  			for (PropertyDescriptor pd : beanInfo.getPropertyDescriptors()) {
  				Object value = null;
  				try {
  					value = pd.getReadMethod().invoke(o);
  				} catch (Exception e) {
  					LOG.warn("Method invokation failed",e);
  				}
  	
  	            // Extract dynamic attributes
  	            if(DYNAMIC_ATTRIBUTE.equals(pd.getName())) {
  	                dataMap.putAll((Map<String, String>)value);
  	            } else {
  					dataMap.put(pd.getName(), value);
  	            }
  			}
  		} catch (IntrospectionException e) {
  			throw new RuntimeException(e);
  		}
  	}
  
  	@Override
  	public String getObjectId() {
  		return (dataMap.containsKey("id") && null != dataMap.get("id")) ? dataMap.get("id").toString() : null;
  	}
  
  	@Override
  	public Object getValue(String fieldKey) {
  		return dataMap.get(fieldKey);
  	}
  
  	@Override
  	public Boolean hasField(String fieldKey) {
  		return dataMap.containsKey(fieldKey);
  	}
  
  }