/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 javax.enterprise.inject;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.inject.Qualifier;

/**
 * <p>The default qualifier type.</p>
 * 
 * <p>If a bean does not explicitly declare a qualifier other than 
 * {@link javax.inject.Named &#064;Named}, the bean has the qualifier 
 * <tt>&#064;Default</tt>.</p>
 * 
 * <p>If an injection point declares no qualifier, the injection point 
 * has exactly one qualifier, the default qualifier 
 * <tt>&#064;Default</tt>.</p>
 *
 * <p>The following are equivalent:</p>
 *
 * <pre>
 * &#064;ConversationScoped
 * public class Order {
 * 
 *    private Product product;
 *    private User customer;
 * 
 *    &#064;Inject
 *    public void init(&#064;Selected Product product, User customer) {
 *       this.product = product;
 *       this.customer = customer;
 *   }
 *
 * }
 * </pre>      
 *
 * <pre>
 * &#064;Default &#064;ConversationScoped
 * public class Order {
 *   
 *    private Product product;
 *    private User customer;
 *   
 *    &#064;Inject
 *    public void init(&#064;Selected Product product, &#064;Default User customer) {
 *       this.product = product;
 *       this.customer = customer;
 *    }
 * 
 * }
 * </pre>
 * 
 * @author Pete Muir
 * @author Gavin King
 */

@Target( { TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface Default
{
}
