/*
    *  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 org.apache.myfaces.trinidad.bean;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.faces.context.FacesContext;
  
  import org.apache.myfaces.trinidad.bean.util.StateUtils;
  import org.apache.myfaces.trinidad.logging.TrinidadLogger;
  
  /**
   * Key for an entry in a FacesBean.
   */
  public class PropertyKey
  {
    /**
     * Capability indicating this property does not support bindings.
     */
    static public final int CAP_NOT_BOUND = 1;
  
    /**
     * Capability indicating this property is transient.
     */
    static public final int CAP_TRANSIENT = 2;
  
    /**
     * Capability indicating this property describes a list.  List
     * PropertyKeys will automatically be marked as not supporting
     * bindings.
     */
    static public final int CAP_LIST = 4;
  
    /**
     * Capability indicating this property can use the StateHolder API.
     */
    static public final int CAP_STATE_HOLDER = 8;
  
    /**
     * Create a named PropertyKey, not attached to any type.
     */
    static public PropertyKey createPropertyKey(String name)
    {
      return new PropertyKey(name);
    }
    
    //
    // Constructors, all package-private.  Only the constructor
    // that takes a simple String could be exposed at all safely;
    // note that state saving cannot possibly re-create an
    // anonymous PropertyKey with anything other than default metadata,
    // so it is only safe to create such a PropertyKey as part
    // of a FacesBean.Type.
    //
    PropertyKey(
      String name)
    {
      this(name, _TYPE_DEFAULT);
    }
    
    PropertyKey(
      String   name,
      Class<?> type)
    {
      this(name, type, null);
    }
  
    PropertyKey(
      String   name,
      Class<?> type,
      Object   defaultValue)
    {
      this(name, type, defaultValue, _CAPS_DEFAULT, -1);
    }
  
    // Needs to be protected for UINodePropertyKey implementation
    protected PropertyKey(
      String   name,
      Class<?> type,
      Object   defaultValue,
      int      capabilities,
     int      index)
   {
     if (name == null)
       throw new NullPointerException();
 
     if (type == null)
       throw new NullPointerException();
 
     if (defaultValue != null)
     {
       // Ensure that default value is legal for this property type.
       Class<?> boxedType = _getBoxedType(type);
       if (!boxedType.isAssignableFrom(defaultValue.getClass()))
       {
         throw new IllegalStateException(_LOG.getMessage(
           "DEFAULT_VALUE_IS_NOT_ASSIGNED_TO_TYPE", new Object[]{defaultValue, type}));
       }
     }
     else
     {
       // Default the default value according to Java Language Specification
       defaultValue = _getJavaDefault(type);
 
       // simplify equality testing in .equals()
       if (defaultValue == null)
         defaultValue = _OBJECT_NULL;
     }
         
     if ((capabilities & ~_CAPS_ALL) != 0)
       throw new IllegalStateException(_LOG.getMessage(
         "CAPABILITY_MASK_NOT_UNDERSTOOD", (capabilities & ~_CAPS_ALL)));
 
     // Lists cannot be bound
     if ((capabilities & CAP_LIST) != 0)
       capabilities = capabilities | CAP_NOT_BOUND;
 
     _name = name;
     _type = type;
     _default = defaultValue;
     _capabilities = capabilities;
     _index = index;
     
     _hashCode = _name.hashCode();
   }
 
   /**
    * Returns the type of this property.
    */
   public Class<?> getType()
   {
     return _type;
   }
 
   /**
    * Returns the default value of this property.
    */
   public Object getDefault()
   {
     return (_default != _OBJECT_NULL) ? _default : null;
   }
 
   /**
    * Returns the owning type for this property key.
    */
   public FacesBean.Type getOwner()
   {
     return _owner;
   }
 
   /**
    * Returns true if the property supports being bound.
    */
   public boolean getSupportsBinding()
   {
     return (_capabilities & CAP_NOT_BOUND) == 0;
   }
 
   /**
    * Returns true if the property is transient.
    */
   public boolean isTransient()
   {
     return (_capabilities & CAP_TRANSIENT) != 0;
   }
 
   /**
    * Returns true if the property is used to store a list.
    */
   public boolean isList()
   {
     return (_capabilities & CAP_LIST) != 0;
   }
 
   /**
    * Returns the name of this property.
    */
   public String getName()
   {
     return _name;
   }
 
   /**
    * Returns the index of this property.
    */
   public int getIndex()
   {
     return _index;
   }
 
 
   public Object saveValue(
     FacesContext context,
     Object value)
   {
     if ((_capabilities & CAP_STATE_HOLDER) != 0)
       return StateUtils.saveStateHolder(context, value);
 
     if (isList())
       return StateUtils.saveList(context, value);
 
     return value;
   }
 
   public Object restoreValue(
     FacesContext context,
     Object savedValue)
   {
     if ((_capabilities & CAP_STATE_HOLDER) != 0)
       return StateUtils.restoreStateHolder(context, savedValue);
 
     if (isList())
       return StateUtils.restoreList(context, savedValue);
 
     return savedValue;
   }
 
   
   @Override
   public boolean equals(Object o)
   {
     if (o == this)
       return true;
 
     if (!(o instanceof PropertyKey))
       return false;
 
     PropertyKey that = (PropertyKey)o;
 
     // If we're not both in the same Type, we're not equals.
     if (_owner != that._owner)
       return false;
 
     // If the index is -1, then it might be an anonymous
     // type, in which case we have to compare names
     int index = this._index;
     if (index == -1)
     {
       return ((that._index == -1) && 
               (that._name.equals(_name)) &&
               (that._type.equals(_type)) &&
               (that._default.equals(_default)));
     }
 
     // But otherwise, since the types are the same, then the
     // same index would imply the same instance - which would
     // have been caught up above.  So, again, this ain't the same equal
     return false;
   }
 
   @Override
   public int hashCode()
   {
     return _hashCode;
   }
 
   @Override
   public String toString()
   {
     String className = getClass().getName();
     int lastPeriod = className.lastIndexOf('.');
     if (lastPeriod >= 0)
       className = className.substring(lastPeriod + 1);
 
     if (_index >= 0)
       return className + "[" + _name + "," + _index + "]";
     return className + "[" + _name + "]";
   }
 
   void __setOwner(FacesBean.Type owner)
   {
     _owner = owner;
   }
 
   static private Object _getJavaDefault(
     Class<?> type)
   {
     return _PRIMITIVE_DEFAULTS.get(type);
   }
   
   static private Class<?> _getBoxedType(
     Class<?> type)
   {
     Class<?> boxedType = _BOXED_PRIMITIVES.get(type);
     return (boxedType != null ? boxedType : type);
   }
   
   static private Map<Class<?>, Object> _createPrimitiveDefaults()
   {
     Map<Class<?>, Object> map = new HashMap<Class<?>, Object>();
     map.put(Boolean.TYPE, Boolean.FALSE);
     map.put(Byte.TYPE, Byte.valueOf((byte)0));
     map.put(Character.TYPE, Character.valueOf('\0'));
     map.put(Double.TYPE, Double.valueOf(0.0));
     map.put(Float.TYPE, Float.valueOf(0.0f));
     map.put(Integer.TYPE, Integer.valueOf(0));
     map.put(Long.TYPE, Long.valueOf(0L));
     map.put(Short.TYPE, Short.valueOf((short)0));
 
     return Collections.unmodifiableMap(map);
   }
 
   static private Map<Class<?>, Class<?>> _createBoxedPrimitives()
   {
     Map<Class<?>, Class<?>> map = new HashMap<Class<?>, Class<?>>();
     map.put(Boolean.TYPE, Boolean.class);
     map.put(Byte.TYPE, Byte.class);
     map.put(Character.TYPE, Character.class);
     map.put(Double.TYPE, Double.class);
     map.put(Float.TYPE, Float.class);
     map.put(Integer.TYPE, Integer.class);
     map.put(Long.TYPE, Long.class);
     map.put(Short.TYPE, Short.class);
 
     return Collections.unmodifiableMap(map);
   }
 
   static private final Map<Class<?>, Object>   _PRIMITIVE_DEFAULTS = _createPrimitiveDefaults();
   static private final Map<Class<?>, Class<?>> _BOXED_PRIMITIVES   = _createBoxedPrimitives();
 
   private final int     _hashCode;
   private final String   _name;
   private final int      _index;
   private final int      _capabilities;
   private final Class<?> _type;
   private final Object   _default;
   private       FacesBean.Type _owner;
 
   static private final int _CAPS_DEFAULT = 
     0;
   
   static private final int _CAPS_ALL = 
     CAP_NOT_BOUND |
     CAP_TRANSIENT |
     CAP_LIST |
     CAP_STATE_HOLDER;
 
   static private final Class<Object> _TYPE_DEFAULT = Object.class;
 
   static private final Object _OBJECT_NULL = new Object();
   private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(
     PropertyKey.class);
 }