/*
    * Copyright 2006-2007 the original author or authors.
    *
    * 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 org.springframework.batch.support;
  
  import java.beans.PropertyEditor;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import org.springframework.beans.PropertyEditorRegistrar;
  import org.springframework.beans.PropertyEditorRegistry;
  import org.springframework.beans.factory.config.CustomEditorConfigurer;
  import org.springframework.util.ClassUtils;
  
  /**
   * A re-usable {@link PropertyEditorRegistrar} that can be used wherever one
   * needs to register custom {@link PropertyEditor} instances with a
   * {@link PropertyEditorRegistry} (like a bean wrapper, or a type converter). It
   * is not thread safe, but useful where one is confident that binding or
   * initialisation can only be single threaded (e.g in a standalone application
   * with no threads).
   * 
   * @author Dave Syer
   * 
   */
  public class DefaultPropertyEditorRegistrar implements PropertyEditorRegistrar {
  
  	private Map<Class<?>, PropertyEditor> customEditors;
  
  	/**
  	 * Register the custom editors with the given registry.
  	 * 
  	 * @see org.springframework.beans.PropertyEditorRegistrar#registerCustomEditors(org.springframework.beans.PropertyEditorRegistry)
  	 */
      @Override
  	public void registerCustomEditors(PropertyEditorRegistry registry) {
  		if (this.customEditors != null) {
  			for (Entry<Class<?>, PropertyEditor> entry : customEditors.entrySet()) {
  				registry.registerCustomEditor(entry.getKey(), entry.getValue());
  			}
  		}
  	}
  
  	/**
  	 * Specify the {@link PropertyEditor custom editors} to register.
  	 * 
  	 * 
  	 * @param customEditors a map of Class to PropertyEditor (or class name to
  	 * PropertyEditor).
  	 * @see CustomEditorConfigurer#setCustomEditors(Map)
  	 */
  	public void setCustomEditors(Map<? extends Object, ? extends PropertyEditor> customEditors) {
  		this.customEditors = new HashMap<Class<?>, PropertyEditor>();
  		for (Entry<? extends Object, ? extends PropertyEditor> entry : customEditors.entrySet()) {
  			Object key = entry.getKey();
  			Class<?> requiredType = null;
  			if (key instanceof Class<?>) {
  				requiredType = (Class<?>) key;
  			}
  			else if (key instanceof String) {
  				String className = (String) key;
  				requiredType = ClassUtils.resolveClassName(className, getClass().getClassLoader());
  			}
  			else {
  				throw new IllegalArgumentException("Invalid key [" + key
  						+ "] for custom editor: needs to be Class or String.");
  			}
  			PropertyEditor value = entry.getValue();
  			this.customEditors.put(requiredType, value);
  		}
  	}
  
  }