/**********************************************
    * Copyright (C) 2011 Lukas Laag
    * This file is part of svgreal.
    * 
    * svgreal is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    * 
   * svgreal is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with svgreal.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.edit.client.model;
  
  import org.vectomatic.svg.edit.client.command.IFactoryInstantiator;
  
  /**
   * Metadata class based on a java script property or a function
   * @author laaglu
   * @param <T>
   * The metadata type
   * @param <U>
   * The javascript type which provides the property or object
   */
  public class JSMetadata<T,U> extends MetadataBase<T,U> {
  	protected IPropertyAccessor<T,U> accessor;
  	public JSMetadata(String propertyName, String description, IFieldFactory fieldFactory, IPropertyAccessor<T,U> accessor, IFactoryInstantiator<?> factory, IValidator<T,U> validator) {
  		super(propertyName, description, fieldFactory, factory, validator);
  		this.accessor = accessor;
  	}
  
  	@Override
  	public T get(U element) {
  		return accessor.get(element);
  	}
  
  	@Override
  	public T set(U element, T value) {
  		T oldValue = accessor.get(element);
  		accessor.set(element, value);
  		return oldValue;
  	}
  
  	@Override
  	public T remove(U element) {
  		throw new IllegalStateException("Property " + propertyName + " cannot be removed");
  	}
  	
  	@Override
  	public String toString() {
  		StringBuilder builder = new StringBuilder("JSMetadata(");
  		builder.append(propertyName);
  		builder.append(")");
  		return builder.toString();
  	}
  }