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   *  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
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  package org.apache.cayenne.reflect;
  
  /**
   * An abstract property descriptor that delegates property access to an {@link Accessor}.
   * Used as a superclass for other implementations.
   * 
   * @since 3.0
   */
  public abstract class BaseProperty implements PropertyDescriptor {
  
      protected ClassDescriptor owner;
      protected Accessor accessor;
  
      // name is derived from accessor, cached here for performance
      final String name;
  
      public BaseProperty(ClassDescriptor owner, Accessor accessor) {
  
          if (accessor == null) {
              throw new IllegalArgumentException("Null accessor");
          }
  
          this.accessor = accessor;
          this.owner = owner;
          this.name = accessor.getName();
      }
  
      public Object readProperty(Object object) throws PropertyException {
          return readPropertyDirectly(object);
      }
  
      public void writeProperty(Object object, Object oldValue, Object newValue)
              throws PropertyException {
          writePropertyDirectly(object, oldValue, newValue);
      }
  
      public String getName() {
          return name;
      }
  
      public abstract boolean visit(PropertyVisitor visitor);
  
      /**
       * Does nothing.
       */
      public void injectValueHolder(Object object) throws PropertyException {
          // noop
      }
  
      public Object readPropertyDirectly(Object object) throws PropertyException {
          return accessor.getValue(object);
      }
  
      public void writePropertyDirectly(Object object, Object oldValue, Object newValue)
              throws PropertyException {
          accessor.setValue(object, newValue);
      }
  
      @Override
      public String toString() {
          StringBuilder buffer = new StringBuilder();
          buffer.append(getClass().getName()).append('@').append(
                  System.identityHashCode(this)).append('[').append(name).append(']');
          return buffer.toString();
      }
  }
  