javax.faces.convert.FacesConverter Maven / Gradle / Ivy
Show all versions of javax.faces Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.convert;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.annotation.Inherited;
/**
* The presence of this annotation
* on a class automatically registers the class with the runtime as a
* {@link Converter}. The value of the {@link #value} attribute is
* taken to be converter-id, the value of the {@link #forClass}
* attribute is taken to be converter-for-class and the fully
* qualified class name of the class to which this annotation is
* attached is taken to be the converter-class. The
* implementation must guarantee that for each class annotated with
* FacesConverter, found with the algorithm in section
* JSF.11.5, the proper variant of
* Application.addConverter() is called. If
* converter-id is not the empty string, {@link
* javax.faces.application.Application#addConverter(java.lang.String,java.lang.String)}
* is called, passing the derived converter-id as the first
* argument and the derived converter-class as the second
* argument. If converter-id is the empty string, {@link
* javax.faces.application.Application#addConverter(java.lang.Class,java.lang.String)}
* is called, passing the converter-for-class as the first
* argument and the derived converter-class as the second
* argument. The implementation must guarantee that all such calls to
* addConverter() happen during application startup time
* and before any requests are serviced.
*
* The preceding text contains an important
* subtlety which application users should understand. It is not
* possible to use a single {@code @FacesConverter} annotation to
* register a single {@code Converter} implementation both in the {@code
* by-class} and the {@code by-converter-id} data structures. One way
* to achieve this result is to put the actual converter logic in an
* abstract base class, without a {@code @FacesConverter} annotation,
* and derive two sub-classes, each with a {@code @FacesConverter}
* annotation. One sub-class has a {@code value} attribute but no
* {@code forClass} attribute, and the other sub-class has the converse.
* Please see the ViewDeclarationLanguage documentation for {@code
* } for another important subtlety regarding
* converters and collections.
*
*
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Inherited
public @interface FacesConverter {
/**
* The value of this annotation
* attribute is taken to be the converter-id with which
* instances of this class of converter can be instantiated by
* calling {@link
* javax.faces.application.Application#createConverter(java.lang.String)}.
*/
String value() default "";
/**
* The value of this annotation
* attribute is taken to be the converter-for-class with
* which instances of this class of converter can be instantiated by
* calling {@link
* javax.faces.application.Application#createConverter(java.lang.Class)}.
*/
Class forClass() default Object.class;
}