/*
    *  Copyright 2001-2013 Stephen Colebourne
    *
    *  Licensed under the Apache 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.apache.org/licenses/LICENSE-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.joda.beans.impl;
  
  import java.util.AbstractMap;
  import java.util.AbstractSet;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  
  import org.joda.beans.Bean;
  import org.joda.beans.MetaProperty;
  import org.joda.beans.Property;
  import org.joda.beans.PropertyMap;
  
  /**
   * A standard map of properties.
   * <p>
   * This is the standard implementation of a map of properties derived from a meta-bean.
   * 
   * @author Stephen Colebourne
   */
  public final class BasicPropertyMap
          extends AbstractMap<String, Property<?>> implements PropertyMap {
  
      /** The bean. */
      private final Bean bean;
  
      /**
       * Factory to create a property map avoiding duplicate generics.
       * 
       * @param bean  the bean
       * @return the property map, not null
       */
      public static BasicPropertyMap of(Bean bean) {
          return new BasicPropertyMap(bean);
      }
  
      /**
       * Creates a property map.
       * 
       * @param bean  the bean that the property is bound to, not null
       */
      private BasicPropertyMap(Bean bean) {
          if (bean == null) {
              throw new NullPointerException("Bean must not be null");
          }
          this.bean = bean;
      }
  
      //-----------------------------------------------------------------------
      @Override
      public int size() {
          return bean.metaBean().metaPropertyCount();
      }
  
      @Override
      public boolean containsKey(Object obj) {
          return obj instanceof String ? bean.metaBean().metaPropertyExists(obj.toString()) : false;
      }
  
      @Override
      public Property<?> get(Object obj) {
          return containsKey(obj) ? bean.metaBean().metaProperty(obj.toString()).createProperty(bean) : null;
      }
  
      @Override
      public Set<String> keySet() {
          return bean.metaBean().metaPropertyMap().keySet();
      }
  
      @Override
      public Set<Entry<String, Property<?>>> entrySet() {
          return new AbstractSet<Entry<String, Property<?>>>() {
              // TODO: possibly override contains()
              @Override
              public int size() {
                  return bean.metaBean().metaPropertyCount();
              }
              @Override
              public Iterator<Entry<String, Property<?>>> iterator() {
                  final Iterator<MetaProperty<?>> it = bean.metaBean().metaPropertyMap().values().iterator();
                  return new Iterator<Entry<String, Property<?>>>() {
                      @Override
                     public boolean hasNext() {
                         return it.hasNext();
                     }
                     @Override
                     public Entry<String, Property<?>> next() {
                         MetaProperty<?> meta = it.next();
                         return new SimpleImmutableEntry<String, Property<?>>(meta.name(), BasicProperty.of(bean, meta));
                     }
                     @Override
                     public void remove() {
                         throw new UnsupportedOperationException("Unmodifiable");
                     }
                 };
             }
         };
     }
 
     //-----------------------------------------------------------------------
     @Override
     public Map<String, Object> flatten() {
         // TODO: dedicated map implementation
         Map<String, MetaProperty<?>> propertyMap = bean.metaBean().metaPropertyMap();
         Map<String, Object> map = new HashMap<String, Object>(propertyMap.size());
         for (Entry<String, MetaProperty<?>> entry : propertyMap.entrySet()) {
             map.put(entry.getKey(), entry.getValue().get(bean));
         }
         return Collections.unmodifiableMap(map);
     }
 
 }