ProductConverter.java

/*
 * Copyright 2011 <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 * 
 * 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.ocpsoft.rewrite.showcase.rest;

import javax.inject.Inject;

import org.ocpsoft.rewrite.context.EvaluationContext;
import org.ocpsoft.rewrite.event.Rewrite;
import org.ocpsoft.rewrite.param.Converter;

/**
 * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 * 
 */
public class ProductConverter implements Converter<Product>
{
   @Inject
   private ProductRegistry products;

   @Override
   public Product convert(final Rewrite event, final EvaluationContext context, final Object value)
   {
      Integer id = new IntegerConverter().convert(event, context, value);
      if (products.getProducts().size() > id) {
         return products.getById(id);
      }

      /*
       * No product!
       */
      return null;
   }

}