/*

  * Copyright 2005-2007 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.core.api.util;

 import org.kuali.rice.core.api.exception.RiceRuntimeException;

 import org.springframework.beans.factory.InitializingBean;

 import java.lang.reflect.Field;

 import java.lang.reflect.Modifier;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.Set;

 /**

  * This class is a map as a SpringBean for Constant properties. 

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class ConstantsMap implements InitializingBean, Map<String, Object> {

         private Map<String, Object> map;

         private Class<?> constantClass;

         @Override

     public void afterPropertiesSet() throws Exception {

             final Map<String, Object> m = new HashMap<String, Object>();

             publishFields(m, constantClass);

             map = Collections.unmodifiableMap(m);

     }

     /**

      * Publishes all of the static, final, non-private fields of the given Class as entries in the given HashMap instance

      * 

      * @param constantMap

      * @param c

      */

     protected void publishFields(Map<String, Object> constantMap, Class<?> c) {

         final Field[] fields = c.getDeclaredFields();

         for (final Field field : fields) {

             final int modifier = field.getModifiers();

             // publish values of static, final, non-private members

             if (Modifier.isStatic(modifier) && Modifier.isFinal(modifier) && !Modifier.isPrivate(modifier)) {

                 try {

                     final String fieldName = field.getName();

                     constantMap.put(fieldName, field.get(null));

                 } catch (IllegalAccessException e) {

                         throw new JSTLConstantExporterException(e);

                 }

             }

         }

         // publish values of appropriate fields of member classes

         publishMemberClassFields(constantMap, c);

     }

     /**

      * Publishes all of the static, final, non-private fields of the non-anonymous member classes of the given Class as entries in

      * the given HashMap instance

      * 

      * @param constantMap

      * @param c

      */

     protected void publishMemberClassFields(Map<String, Object> constantMap, Class<?> c) {

         final Class<?>[] memberClasses = c.getClasses();

         for (final Class<?> memberClass : memberClasses) {

             if (!memberClass.isAnonymousClass()) {

                 final String memberPrefix = memberClass.getSimpleName();

                 final Map<String, Object> subclassMap = new HashMap<String, Object>();

                 publishFields(subclassMap, memberClass);

                 constantMap.put(memberPrefix, Collections.unmodifiableMap(subclassMap));

             }

         }

     }

     public Class<?> getConstantClass() {

                 return this.constantClass;

         }

         public void setConstantClass(Class<?> constantClass) {

                 this.constantClass = constantClass;

         }

     //delegate methods

         @Override

         public int size() {

                 return this.map.size();

         }

         @Override

         public boolean isEmpty() {

                 return this.map.isEmpty();

         }

         @Override

         public boolean containsKey(Object key) {

                 return this.map.containsKey(key);

         }

         @Override

         public boolean containsValue(Object value) {

                 return this.map.containsValue(value);

         }

         @Override

         public Object get(Object key) {

                 return this.map.get(key);

         }

         @Override

         public Object put(String key, Object value) {

                 return this.map.put(key, value);

         }

         @Override

         public Object remove(Object key) {

                 return this.map.remove(key);

         }

         @Override

         public void putAll(Map<? extends String, ? extends Object> m) {

                 this.map.putAll(m);

         }

         @Override

         public void clear() {

                 this.map.clear();

         }

         @Override

         public Set<String> keySet() {

                 return this.map.keySet();

         }

         @Override

         public Collection<Object> values() {

                 return this.map.values();

         }

         @Override

         public Set<java.util.Map.Entry<String, Object>> entrySet() {

                 return this.map.entrySet();

         }

         @Override

         public boolean equals(Object o) {

                 return this.map.equals(o);

         }

         @Override

         public int hashCode() {

                 return this.map.hashCode();

         }

         private static class JSTLConstantExporterException extends RiceRuntimeException {

                 public JSTLConstantExporterException(Throwable t) {

                         super(t);

                 }

         }

 }