/*
    * Copyright 2012 Olivier Godineau
    * 
    * 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 olg.csv.bean.loader.getter.impl;
  
  import javax.xml.xpath.XPathExpressionException;
  
  import olg.csv.bean.getter.AbstractGetter;
  import olg.csv.bean.loader.CustomLoader;
  import olg.csv.bean.loader.LoadException;
  import olg.csv.bean.loader.getter.AbstractGetterLoader;
  
  import org.w3c.dom.Element;
  
  /**
   * The loader used to load a user getter described in XML node. This node must
   * to be conformed to CustomType as defined in our XML schema.
   * 
   * @see CustomLoader
   * 
   */
  public final class CustomGetterLoader extends AbstractGetterLoader {
  
  	/**
  	 * Constructs a loader bound with the custom node.
  	 * 
  	 * @param successor
  	 *            the next getter loader in the loader chain.
  	 */
  	public CustomGetterLoader(AbstractGetterLoader successor) {
  		super("custom", successor);
  
  	}
  
  	@Override
  	protected AbstractGetter getConcreteGetter(Element node, String defaultValue) throws XPathExpressionException,
  			LoadException {
  		Object object = CustomLoader.getBean(node);
  		if (!(object instanceof AbstractGetter)) {
  			throw new LoadException(object.getClass() + " must extend " + AbstractGetter.class);
  		}
  		AbstractGetter getter = (AbstractGetter) object;
  		getter.setDefaultValue(defaultValue);
  		return getter;
  	}
  
  }