org.glassfish.apf.AnnotationProcessor Maven / Gradle / Ivy
Show all versions of payara-embedded-web 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 org.glassfish.apf;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.reflect.AnnotatedElement;
import java.util.logging.Level;
/**
*
* The annotation processor is the core engine to process annotations.
* All the processing configuration (input classes, error handlers, etc...)
* is provided by the ProcessingContext which can be either created from the
* createContext method or through another mean. Once the ProcessingContext has
* been initialized, it is passed to the process(ProcessingContext ctx) method which
* triggers the annotation processing.
*
*
*
* Each class accessible from the ProcessingContext.getInputScanner instance, will be
* scanned for annotations.
* Each annotation will then be processed by invoking the corresponding AnnotationHandler
* from its annotation type.
*
*
*
* The AnnotationProcessor can be configured by using the pushAnnotationHandler and
* popAnnotationHandler which allow new AnnotationHandler instances to be registered and
* unregistered for a particular annotation type.
*
*
*
* Even without reconfiguring the AnnotationProcessor instance with the above
* configuration methods, the AnnotationProcessor implementation cannot guarantee
* to be thread safe, therefore, it is encouraged the make instanciation cheap
* and users should not use the same instance concurrently.
*
*
* @author Jerome Dochez
*/
public interface AnnotationProcessor {
/**
* Creates a new empty ProcessingContext instance which can be configured
* before invoking the process() method.
* @return an empty ProcessingContext
*/
public ProcessingContext createContext();
/**
* Starts the annotation processing tool passing the processing context which
* encapuslate all information necessary for the configuration of the tool.
* @param ctx is the initialized processing context
* @return the result of the annoations processing
*/
public ProcessingResult process(ProcessingContext ctx) throws AnnotationProcessorException;
/**
* Process a set of classes from the parameter list rather than from the
* processing context. This allow the annotation handlers to call be the
* annotation processing tool when classes need to be processed in a
* particular context rather than when they are picked up by the scanner.
*
* @param the processing context
* @param the list of classes to process
* @return the processing result for such classes
* @throws AnnotationProcessorException if handlers fail to process
* an annotation
*/
public ProcessingResult process(ProcessingContext ctx, Class[] classes)
throws AnnotationProcessorException;
/**
* Registers a new AnnotationHandler for a particular annotation type. New annotation handler
* are pushed on a List of annotation handlers for that particular annotation type, the last
* annotation handler to be registered will be invoked first and so on.
* The annotation type handled by the AnnotationHandler instance is defined
* by the getAnnotationType() method of the AnnotationHandler instance
*
* @param type the annotation type
* @param handler the annotation handler instance
*/
public void pushAnnotationHandler(AnnotationHandler handler);
/**
* @return the top annotation handler for a particular annotation type
* @param type the annotation type
*/
public AnnotationHandler getAnnotationHandler(Class type);
/**
* Unregisters the last annotation handler registered for an annotation type.
* @param type the annotation type.
*/
public void popAnnotationHandler(Class type);
/**
* @return the most recent AnnotatedElement being processed which type is of the
* given ElementType or null if there is no such element in the stack of
* processed annotation elements.
*/
public AnnotatedElement getLastAnnotatedElement(ElementType type);
/**
* Log a message on the default logger
*/
public void log(Level level, AnnotationInfo locator, String localizedMessage);
}