/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 javax.faces.component;
  
  import java.io.Serializable;
  import java.util.AbstractCollection;
  import java.util.AbstractSet;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  
  class _ComponentFacetMap<V extends UIComponent> implements Map<String, V>, Serializable
  {
      private static final long serialVersionUID = -3456937594422167629L;
      private UIComponent _component;
      private Map<String, V> _map = new _ArrayMap<String, V>(0,5);
      private Set<Entry<String, V>> _entrySet = null;
      private Set<String> _keySet = null;
      private Collection<V> _valueCollection = null;
  
      _ComponentFacetMap(UIComponent component)
      {
          _component = component;
      }
  
      @Override
      public int size()
      {
          return _map.size();
      }
  
      @Override
      public void clear()
      {
          UIComponent[] values = _map.values().toArray(new UIComponent[_map.size()]);
          //remove all elements from underlying map
          _map.clear();
          //Set parent to null
          for (int i = 0; i < values.length; i++)
          {
              values[i].setParent(null);
          }
      }
  
      @Override
      public boolean isEmpty()
      {
          return _map.isEmpty();
      }
  
      @Override
      public boolean containsKey(Object key)
      {
          checkKey(key);
          return _map.containsKey(key);
      }
  
      @Override
      public boolean containsValue(Object value)
      {
          checkValue(value);
          return _map.containsValue(value);
      }
  
      @Override
      public Collection<V> values()
      {
          if (_valueCollection == null)
          {
              _valueCollection= new ComponentFacetValueCollection();
          }
          return _valueCollection;
      }
  
      @Override
      public void putAll(Map<? extends String, ? extends V> t)
      {
          for (Map.Entry<? extends String, ? extends V> entry : t.entrySet())
          {
              put(entry.getKey(), entry.getValue());
          }
      }
 
     @Override
     public Set<Entry<String, V>> entrySet()
     {
         if (_entrySet == null)
         {
             _entrySet = new ComponentFacetEntrySet();
         }
         return _entrySet;
     }
 
     @Override
     public Set<String> keySet()
     {
         if (_keySet == null)
         {
             _keySet = new ComponentFacetKeySet();
         }
         return _keySet;
     }
 
     @Override
     public V get(Object key)
     {
         checkKey(key);
         return _map.get(key);
     }
 
     @Override
     public V remove(Object key)
     {
         checkKey(key);
         V facet = _map.remove(key);
         if (facet != null)
         {
             facet.setParent(null);
         }
         return facet;
     }
 
     @Override
     public V put(String key, V value)
     {
         //checkKey(key);
         if (key == null)
         {
             throw new NullPointerException("key");
         }
         //checkValue(value);
         if (value == null)
         {
             throw new NullPointerException("value");
         }
         setNewParent(key, value);
         V previousValue = _map.put(key, value);
         if (previousValue != null)
         {
             previousValue.setParent(null);
         }
         return previousValue; 
     }
 
     private void setNewParent(String facetName, UIComponent facet)
     {
         UIComponent oldParent = facet.getParent();
         if (oldParent != null)
         {
             if (!oldParent.getChildren().remove(facet))
             {
                 // Check if the component is inside a facet and remove from there
                 if (oldParent.getFacetCount() > 0)
                 {
                     for (Iterator< Map.Entry<String, UIComponent > > it = 
                         oldParent.getFacets().entrySet().iterator() ; it.hasNext() ; )
                     {
                         Map.Entry<String, UIComponent > entry = it.next();
                         
                         if (entry.getValue().equals(facet))
                         {
                             it.remove();
                             break;
                         }
                     }
                 }
             }
         }
         facet.setParent(_component);
     }
 
     private void checkKey(Object key)
     {
         if (key == null)
         {
             throw new NullPointerException("key");
         }
         if (!(key instanceof String))
         {
             throw new ClassCastException("key is not a String");
         }
     }
 
     private void checkValue(Object value)
     {
         if (value == null)
         {
             throw new NullPointerException("value");
         }
         if (!(value instanceof UIComponent))
         {
             throw new ClassCastException("value is not a UIComponent");
         }
     }
 
     private class ComponentFacetEntrySet extends AbstractSet<Entry<String, V>>
     {
         public ComponentFacetEntrySet()
         {
         }
         
         @Override
         public int size()
         {
             return _map.size();
         }
 
         @Override
         public boolean isEmpty()
         {
             return _map.isEmpty();
         }
 
         @Override
         public boolean contains(Object o)
         {
             return _map.entrySet().contains(o);
         }
 
         @Override
         public Iterator<java.util.Map.Entry<String, V>> iterator()
         {
             return new ComponentFacetEntryIterator(_map.entrySet().iterator());
         }
 
         @Override
         public Object[] toArray()
         {
             return _map.entrySet().toArray();
         }
 
         @Override
         public <T> T[] toArray(T[] a)
         {
             return _map.entrySet().toArray(a);
         }
 
         @Override
         public boolean add(java.util.Map.Entry<String, V> o)
         {
             // Add over the entry set is not allowed, because this should be done
             // through the outer Map instance.
             throw new UnsupportedOperationException();
         }
 
         @Override
         @SuppressWarnings("unchecked")
         public boolean remove(Object o)
         {
             if (_map.entrySet().remove(o))
             {
                 if (o instanceof Map.Entry)
                 {
                     Object value = ((Map.Entry<String, V>) o).getValue();
                     
                     if (value != null && value instanceof UIComponent)
                     {
                         ((UIComponent) value).setParent(null);
                     }
                 }
                 return true;
             }
             else
             {
                 return false;
             }
         }
 
         @Override
         public boolean containsAll(Collection<?> c)
         {
             return _map.entrySet().containsAll(c);
         }
 
         @Override
         public boolean addAll(Collection<? extends java.util.Map.Entry<String, V>> c)
         {
             // Add over the entry set is not allowed, because this should be done
             // through the outer Map instance.
             throw new UnsupportedOperationException();
         }
 
         @Override
         public boolean equals(Object obj)
         {
             return _map.entrySet().equals(obj);
         }
 
         @Override
         public int hashCode()
         {
             return _map.entrySet().hashCode();
         }
 
         @Override
         public String toString()
         {
             return _map.entrySet().toString();
         }
     }
     
     private class ComponentFacetEntryIterator implements Iterator<Map.Entry<String, V>>
     {
         private Iterator<Map.Entry<String, V>> _delegate;
         private V _currentEntryValue;
         
         public ComponentFacetEntryIterator(Iterator<Map.Entry<String, V>> it)
         {
             _delegate = it;
             _currentEntryValue = null;
         }
         
         @Override
         public boolean hasNext()
         {
             return _delegate.hasNext();
         }
 
         @Override
         public java.util.Map.Entry<String, V> next()
         {
             java.util.Map.Entry<String, V> next = _delegate.next(); 
             _currentEntryValue = next.getValue();
             return new ComponentFacetEntry(next);
         }
 
         @Override
         public void remove()
         {
             _delegate.remove();
             if (_currentEntryValue != null)
             {
                 _currentEntryValue.setParent(null);
             }
         }
     }
 
     /**
      * Wrapper used to override setValue() method
      * 
      */
     private class ComponentFacetEntry implements Map.Entry<String, V>
     {
         private java.util.Map.Entry<String, V> _entry;
         
         public ComponentFacetEntry(java.util.Map.Entry<String, V> entry)
         {
             _entry = entry;
         }
 
         @Override
         public String getKey()
         {
             return _entry.getKey();
         }
 
         @Override
         public V getValue()
         {
             return _entry.getValue();
         }
 
         @Override
         public V setValue(V value)
         {
             setNewParent(_entry.getKey(), value);
             V previousValue = _entry.setValue(value);
             if (previousValue != null)
             {
                 previousValue.setParent(null);
             }
             return previousValue;
         }
 
         @Override
         public int hashCode()
         {
             return _entry.hashCode();
         }
 
         @Override
         public boolean equals(Object obj)
         {
             return _entry.equals(obj);
         }
 
         @Override
         public String toString()
         {
             return _entry.toString();
         }
     }
     
     private class ComponentFacetKeySet extends AbstractSet<String>
     {
 
         public ComponentFacetKeySet()
         {
         }
         
         @Override
         public int size()
         {
             return _map.keySet().size();
         }
 
         @Override
         public boolean isEmpty()
         {
             return _map.keySet().isEmpty();
         }
 
         @Override
         public boolean contains(Object o)
         {
             return _map.keySet().contains(o);
         }
 
         @Override
         public Iterator<String> iterator()
         {
             // Iterate over entrySet is equals to iterate over keySet, but
             // in this case is better use entrySet iterator, because we can
             // get the value directly and call setParent(null) if the entry is
             // removed
             return new ComponentFacetKeyIterator(_map.entrySet().iterator());
         }
 
         @Override
         public Object[] toArray()
         {
             return _map.keySet().toArray();
         }
 
         @Override
         public <T> T[] toArray(T[] a)
         {
             return _map.keySet().toArray(a);
         }
 
         @Override
         public boolean add(String o)
         {
             throw new UnsupportedOperationException();
         }
 
         @Override
         public boolean remove(Object o)
         {
             V previousValue = _map.get(o);
             if (_map.keySet().remove(o))
             {
                 if (previousValue != null)
                 {
                     ((UIComponent) previousValue).setParent(null);
                 }
                 return true;
             }
             else
             {
                 return false;
             }
         }
 
         @Override
         public boolean containsAll(Collection<?> c)
         {
             return _map.keySet().containsAll(c);
         }
 
         @Override
         public boolean addAll(Collection<? extends String> c)
         {
             throw new UnsupportedOperationException();
         }
 
         @Override
         public boolean equals(Object obj)
         {
             return _map.keySet().equals(obj);
         }
 
         @Override
         public int hashCode()
         {
             return _map.keySet().hashCode();
         }
 
         @Override
         public String toString()
         {
             return _map.keySet().toString();
         }
     }
     
     private class ComponentFacetKeyIterator implements Iterator<String>
     {
         private Iterator<Map.Entry<String, V>> _delegate;
         private V _currentEntryValue;
         
         public ComponentFacetKeyIterator(Iterator<Map.Entry<String, V>> it)
         {
             _delegate = it;
             _currentEntryValue = null;
         }
         
         @Override
         public boolean hasNext()
         {
             return _delegate.hasNext();
         }
 
         @Override
         public String next()
         {
             java.util.Map.Entry<String, V> next = _delegate.next(); 
             _currentEntryValue = next.getValue();
             return next.getKey();
         }
 
         @Override
         public void remove()
         {
             _delegate.remove();
             if (_currentEntryValue != null)
             {
                 _currentEntryValue.setParent(null);
             }
         }
     }
 
     private class ComponentFacetValueCollection extends AbstractCollection<V>
     {
         public ComponentFacetValueCollection()
         {
         }
 
         @Override
         public int size()
         {
             return _map.values().size();
         }
 
         @Override
         public boolean isEmpty()
         {
             return _map.values().isEmpty();
         }
 
         @Override
         public boolean contains(Object o)
         {
             return _map.values().contains(o);
         }
 
         @Override
         public Iterator<V> iterator()
         {
             return new ComponentFacetValueIterator(_map.entrySet().iterator());
         }
 
         @Override
         public Object[] toArray()
         {
             return _map.values().toArray();
         }
 
         @Override
         public <T> T[] toArray(T[] a)
         {
             return _map.values().toArray(a);
         }
 
         @Override
         public boolean add(V o)
         {
             // Add over the entry set is not allowed, because this should be done
             // through the outer Map instance.
             throw new UnsupportedOperationException();
         }
 
         @Override
         public boolean containsAll(Collection<?> c)
         {
             return _map.values().containsAll(c);
         }
 
         @Override
         public boolean addAll(Collection<? extends V> c)
         {
             // Add over the entry set is not allowed, because this should be done
             // through the outer Map instance.
             throw new UnsupportedOperationException();
         }
 
         @Override
         public boolean equals(Object obj)
         {
             return _map.values().equals(obj);
         }
 
         @Override
         public int hashCode()
         {
             return _map.values().hashCode();
         }
 
         @Override
         public String toString()
         {
             return _map.values().toString();
         }
     }
     
     private class ComponentFacetValueIterator implements Iterator<V>
     {
         private Iterator<Map.Entry<String, V>> _delegate;
         private V _currentEntryValue;
         
         public ComponentFacetValueIterator(Iterator<Map.Entry<String, V>> it)
         {
             _delegate = it;
             _currentEntryValue = null;
         }
         
         @Override
         public boolean hasNext()
         {
             return _delegate.hasNext();
         }
 
         @Override
         public V next()
         {
             java.util.Map.Entry<String, V> next = _delegate.next(); 
             _currentEntryValue = next.getValue();
             return next.getValue();
         }
 
         @Override
         public void remove()
         {
             _delegate.remove();
             if (_currentEntryValue != null)
             {
                 _currentEntryValue.setParent(null);
             }
         }
     }
 }