/**

  * 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>();

                 Map<String, PropertyDescriptor> beanInfo = getBeanInfo(o.getClass());

                 for (String propName : beanInfo.keySet()) {

                     PropertyDescriptor pd = beanInfo.get(propName);

                         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(propName)) {

                 dataMap.putAll((Map<String, String>)value);

             } else {

                                 dataMap.put(propName, value);

             }

                 }

         }

         @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);

         }

         private Map<String, PropertyDescriptor> getBeanInfo(Class<?> clazz) {

                 Map<String, PropertyDescriptor> properties = new HashMap<String, PropertyDescriptor>();

                 BeanInfo beanInfo = null;

                 try {

                         beanInfo = Introspector.getBeanInfo(clazz);

                 } catch (IntrospectionException e) {

                         throw new RuntimeException(e);

                 }

                 PropertyDescriptor[] propertyDescriptors = beanInfo

                                 .getPropertyDescriptors();

                 for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {

                         properties.put(propertyDescriptor.getName(), propertyDescriptor);

                 }

                 return properties;

         }

 }